postgresql if exists then

I doubt that this is really sane behavior. Then there is no way they could make it into your system even if you (or someone) has a defect in the code that could potentially create one. Syntax: CREATE SEQUENCE [ IF NOT EXISTS ] sequence_name [ AS { SMALLINT | INT | BIGINT } ] [ INCREMENT [ BY ] increment ] [ MINVALUE minvalue | NO … Just annoying. When the Server is started (some tables do not exist) and the following query gives me an exception: UPDATE recipes SET lock = null WHERE lock IS NOT NULL; Relation >>recipes<< does not exists. PostgreSQL: Create TABLE IF NOT EXISTS Table IF NOT EXISTS is available from PostgreSQL 9.1. In the example above make userid a clustered primary key. Whenever the CustomerID exists, the user gets the message and automatically the cursor positions in the next field CustomerName. There are several ways to check the table exist in the particular schema , some solutions are described below. PostgreSQLTutorial.com is a website dedicated to developers and database administrators who are working on PostgreSQL database management system. I am trying to get a psql function that would truncate a given table name if it exists. The SQL CASE expression is a generic conditional expression, similar to if/else statements in other programming languages: CASE WHEN condition THEN result [ WHEN... ] [ ELSE result ] END CASE clauses can be used wherever an expression is valid. table_name = 'class' PostgreSQL: How to check if a table exists in a given schema? I have a table that contains a large amount of data which gets updated daily with either new data, or data (rows) that already exist in the table but need updating. What I want is: Check if some row exists, and if exists then check for an another row if row exists. You can formulate conditional expressions in PostgreSQL using WHEN-THEN case which is very similar to if-else blocks. Conditional expressions are one of the most fundamental elements of any programming paradigm. Table IF NOT EXISTS is available from PostgreSQL 9.1. where username is the name of the user you would like to drop from PostgreSQL. Query to check tables exists or not in PostgreSQL Schema or not 1: SELECT EXISTS( This might not help you, because 8.2 is still months away from being "production quality". But I want it to rename a table with the same name if it finds an existing one. It’s easy to avoid this error by using the IF NOT EXISTS option with your ADD COLUMN clause. This option basically helps to perform DML actions like, Insert IF not Exists, Update IF Exists. ... For example, if I want to check the employee table exists or not in "public" schema, then execute the following query. Let’s verify this. Description. Here’s the code but keep in mind that it makes the assumption that everything is in the public schema. Step 4) Drop the database with IF exists clause and you get a warning drop database IF EXISTS guru99 PostgreSQL Drop Database PgAdmin (GUI) Step 1) Right Click on database "guru99" and click "Delete/Drop." This is not a critical problem. May 13, 2002 at 2:15 pm: Is there an sql query that I can use on postgres that will tell me if a table exists? The dropdb command allows you to delete database remotely. ); SELECT EXISTS( Fastest check if row exists in PostgreSQL (5) I have a bunch of rows that I need to insert into table, but these inserts are always done in batches. You can drop more than one user at a time, by provided the user names separated by comma. In Bash you can use the test command to check whether a file exist and determine the type of the file. We constantly publish useful PostgreSQL tutorials to keep you up-to-date with the latest PostgreSQL features and technologies. BTW, while I can see the reason for adding the IF EXISTS clause to the language for checking the existence of objects, wouldn't it be easier to simply provide the PL/PgSQL language for script loading? DROP TABLE removes tables from the database. 'if count is greater than 0, then the CustomerID already exists If myR.RecordCount > 0 Then MsgBox "A Customer with this ID is already exist" End If. The EXISTS version has an associated cost that is almost 30x lower than the version that uses COUNT(*) for the same result. SELECT 1 If the condition evaluates to false, the control is passed to the next statement after the END if part. Jeff Davis In 8.2, which is currently still in production, they have added the feature where you can do things like: DROP SEQUENCE IF EXISTS mysequence; CREATE SEQUENCE mysequence; Which makes writing SQL scripts much easier. This ensures your data can never be invalid/corrupted. However, it does not provide such straight forward way while adding a column to check if the column is already there in the table or not. After that, we have added a check that the collection exists or not and if exists then delete that. 1) PL/pgSQL if-then statement. PostgreSQL provide an option of checking if the column already exists or not while dropping the column. Bonjour Personnellement je n'ai encore eu le temps de tester la 8.1.0 pour savoir celà! I am creating a SQL Script in PostgreSQL. Vincent Stoessel. Code: DO $$ BEGIN IF EXISTS (SELECT FROM educational_platforms WHERE technology='psql') THEN I need it to check if a function exists in the database and if so, I need to execute the drop first and then a CREATE...the pseudo code would be something like this: Introduction. The result of EXISTS operator depends on whether any row returned by the subquery, and not on the row contents. The EXISTS operator is a boolean operator that tests for existence of rows in a subquery. SELECT to_regclass('foo'); Returns NULL if the identifier is not found in the search path. The EXISTS operator is often used with the correlated subquery. If 'foo' is found, the oid is returned in its text representation. When you remove a column from a table, PostgreSQL will automatically remove all of the indexes and constraints that involved the dropped column.. FROM information_schema.tables If table exists then output will be ‘t’ otherwise ‘f’. table_schema = 'public' AND PostgreSQL: How to check if a table exists in a given schema? In this tutorial, you have learned how to use the PostgreSQL EXISTS to test for the existence of rows in the subquery. In case the subquery returns no row, the result is of EXISTS is false. The if statement executes statements if a condition is true. If you use IF EXISTS to delete a non-existing trigger, PostgreSQL issues a notice instead. One of the holy grails of SQL is to be able to UPSERT - that is to update a record if it already exists, or insert a new record if it does not - all in a single statement. SELECT 1 The PostgreSQL EXISTS condition is a type of Boolean operator which returns the true or false result. FROM information_schema.tables Thanks--Vincent Stoessel Therefore, columns that appear on the SELECT clause of the subquery are not important. In this article, we are going to check whether a table exists in PostgreSQL schema or not. First, I'll create an "Employee" table and give examples on it. SELECT EXISTS ( SELECT FROM information_schema. This option basically helps to perform DML actions like, Insert IF not Exists, Update IF Exists. Common conditional expressions include if-else blocks and switch cases. In PostgreSQL, the ALTER TABLE statement can be used to add, delete or modify your table. SELECT * SQL: A basic UPSERT in PostgreSQL Tweet 0 Shares 0 Tweets 5 Comments. Following queries are used in this article. This command conforms to the SQL standard, except that the standard only allows one table to be dropped per command, and apart from the IF EXISTS option, which is a PostgreSQL extension. Let’s say we wish to deploy a stored procedure ‘stpGetAllMembers’ in the SQLShack test database. table_schema = 'public' AND ); SELECT EXISTS ( In case the subquery returns no row, the result is of EXISTS is false. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement. If you do not want a duplicate user name then create a unique index constraint on username. FROM information_schema.tables Because, before PostgreSQL 9.1 this was not there and still they perception is the same. Also, notice that People who are using PostgreSQL new version those are … I've been trying multiple functions, but none of them worked so far. Example – Delete a User. This means that the operator is used together with a subquery. PostgreSQL Subquery. The NOT operator negates the result of the EXISTS operator. WHERE If the subquery returns at least one row, the result of EXISTS is true. SELECT * This option instructs PostgreSQL to add the new column onlyif the column name does not exist in the table. SELECT 1 WHERE 9.16.1. The following illustrates syntax of the EXISTS operator: The EXISTS accepts an argument which is a subquery. In my last post I showed you a simple way to check to see if a constraint already existed in PostgreSQL. [PostgreSQL] if exists? In PostgreSQL, things are more drastic (going from 123 to 3.4). In this section, we are going to understand the working of PostgreSQL Subquery, which allows us to create a difficult query.And we also see examples of subqueries with different clauses such as SELECT, FROM, and WHERE, different Conditions such as IN, EXISTS, and different Queries such as SELECT, INSERT, UPDATE, and DELETE. When you’re performing an INSERT operation in PostgreSQL, there may be times when a duplicate record already exists in the table. In this article, w… Then we put the select result into a variable and put an IF-condition around our CREATE or DROP statement. PostgreSQL and other relational database management systems use databases and tables to structure and organize their data. We will use the following customerand payment tables in the sample database for the demonstration: The following statement returns customers who have paid at least one rental with an amount greater than 11: In this example, for each customer in the customer table, the subquery checks the payment table to find if that customer made at least one payment (p.customer_id = c.customer_id) and the amount is greater than 11 ( amount > 11). In Postgres 9.3 or older use a cast to regclass: SELECT 'foo'::regclass; This raises an exception, if the object is not found! To empty a table of rows without destroying the table, use DELETE or TRUNCATE.. DROP TABLE always removes any indexes, rules, triggers, and constraints that exist for the target table. All PostgreSQL tutorials are simple, easy-to-follow and practical. I am sharing this primary because many people are still using PostgreSQL old version. Select from tableA - if not exists then tableB. table_schema = 'schemaname' AND SELECT * Riccardo G. Facchini Sorry: I forgot to add something to option 2 --- "ON.KG" wrote: Option 1: tells you if the table exists in your database select * from pg_catalog.pg_tables as t where t.schemaname = '' and t.tablename = ' principle of least astonishment dictate that the IF NOT EXISTS option > apply implicitly to each sub-object as WHERE table_schema = 'public' and table_name='class'); How to change owner of database in PostgreSQL, How to check list of privileges on a table in PostgreSQL, How to Copy table from one database to another in PostgreSQL, How to get the PostgreSQL table structure. dropdb command. If table exists then output will be ‘t’ otherwise ‘f’. This PostgreSQL tutorial explains how to use the AND condition and the OR condition together in a PostgreSQL query with syntax and examples. WHERE table_schema = 'public' and table_name='student'); SELECT EXISTS ( So I want to check if a single row from the batch exists in the table because then I know they all were inserted. The DROP TRIGGER statement in PostgreSQL is incompatible with the SQL standard. If you’d prefer to update the existing row in those cases, the PostgreSQL UPSERT functionality can help you get the job done. Then we write a block and find by a select in the data dictionary if the object we are creating or dropping exists. Finally, we have to achieve our goal. I have a table that contains a large amount of data which gets updated daily with either new data, or data (rows) that already exist in the table but need updating. Format 2 contains a simple if and if the condition evaluates to false then the else block will be executed. FROM information_schema.tables If record exists then update, else insert new record. PostgreSQL treats LEFT JOIN and NOT EXISTS equally, using same execution plan for both of them (namely a Hash Anti Join for the example above). The EXISTS operator tests whether a row(s) exists in a subquery. In this post, I am sharing the different options to check weather your table exists in your database or not. In relational databases, the term upsert is referred to as merge. The following example returns customers have not made any payment that greater than 11. For this reason, the common coding convention is to write EXISTS in the following form: Note that if the subquery returns NULL, the result of EXISTS is true. I am sharing this primary because many people are still using PostgreSQL old version. The Exists operator is said to have been met when at least one row is found in the subquery. All Rights Reserved. If record exists then update, else insert new record. End Sub. from a PLPGSQL function? company schema names always start … Third, specify the name of the table to which the trigger belongs. Also, notice that People who are using PostgreSQL new version those are still not using TABLE IF NOT EXISTS. Consider a PostgreSQL where there are two users as shown in the following. However, you’ll encounter an error if you attempt to add a column that already exists. There are several ways to check the table exist in the particular schema, some solutions are described below. The EXISTS operator is often used with the correlated subquery. They also made it work for other objects, like DROP TABLE IF EXISTS, etc. If Not rs.EOF Then // Exists End If. Query to check tables exists or not in PostgreSQL Schema or not 1: SELECT EXISTS( SELECT * FROM information_schema.tables WHERE table_schema = 'schemaname' AND table_name = … The PostgreSQL AND condition and OR condition can be combined in a SELECT, INSERT, UPDATE, or DELETE statement. Summary: in this tutorial, you will learn how to use the PostgreSQL EXISTS operator to test for existence of rows in a subquery. We have first created everything from scratch and the list the collections inside the database. WHERE In this example, we are going to drop user lini. Many times when writing Shell scripts, you may find yourself in a situation where you need to perform an action based on whether a file exists or not. This can be, however, simulate in psql with the \gexec parameter.. ); SELECT EXISTS( The clients then create tables in the database if they don't exists. Destroy the trigger if_dist_exists on the table films: DROP TRIGGER if_dist_exists ON films; Compatibility. To avoid this situation, usually, developers add T-SQL If Exists statement and drop the object if it is already available in the database. Ok, thanks, Jeff. 1) Drop a table that does not exist. If the subquery returns at least one row, the result of EXISTS is true. SELECT 'CREATE DATABASE ' WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = '') \gexec \gexec sends the current query buffer to the server, then treats each … Then comes the declaration part where we declare our variable named age and initialize it to 23 integer value. I know about the exists feature, but that does not help me with the given situation. Now I want to show you how to do the same thing for an index. In this tutorial, we looked at some examples of how to perform a PostgreSQL UPSERT. when - postgresql if exists then . tables Upsert statements used to be planned for 9.1 but have been postponed to 9.2, so until then, your only choice is to test if the value already exists before inserting. After a long time of waiting, PostgreSQL 9.5 introduced INSERT ON CONFLICT [DO UPDATE] [DO NOTHING]. If the subquery returns one or more rows, the NOT EXISTS returns false. Now, if an entry with psql technology exists then we have to update the client count of that entry to 100 else insert the record with psql technology. The following statement removes … The PostgreSQL EXISTS condition is used in combination with a subquery and is considered "to be met" if the subquery returns at least one row. Let’s take some examples of using the PostgreSQL DROP TABLE statement. Hello all, Can anyone advise how to check if a table exists already in PostgreSQL? I want to avoid this exception by checking if this table exists … In other words, we can say that: If a subquery returns any record, the Exists condition will return a TRUE value, or else, it will return a FALSE Thank you, Tim. Here are the statements that will do so. IF EXISTS which is optional checks if the user is available and then proceeds with the action. Python PostgreSQL drop table only if exists Article Creation Date : 19-Jul-2019 05:02:38 PM This PostgreSQL tutorial explains how to use the PostgreSQL EXISTS condition with syntax and examples. Following queries are used in this article. Explanation: The DO statement specifies that Postgres needs to execute the following statements below it. (4 replies) Even if I've been using Postgres for some years, I figure that this question fits best on this list: How do I check if a table exists, eg. In the SQL standard, trigger names are not local to tables, so the command is simply DROP TRIGGER name. The NOT EXISTS is opposite to EXISTS. Copyright © 2020 by PostgreSQL Tutorial Website. FROM information_schema.tables table_name = 'student' You can drop more than one user at a time, by provided the user names separated by comma. table_name = 'tablename' This condition can be any expression ranging from variable comparison to query result or isNull statement or exists statement that returns a boolean value. The CREATE SEQUENCE statement is used to create sequences in PostgreSQL. IF EXISTS which is optional checks if the user is available and then proceeds with the action. Step 2) Click OK on the confirmation pop-up . ); Query to check tables exists or not in PostgreSQL Schema or not 2: SELECT EXISTS ( I tried some code from google searches, but none seem to work. In this section, we are going to understand the working of PostgreSQL EXISTS Condition, which is used with the WHERE clause to evaluate the existing rows in a subquery. In this tutorial, we looked at some examples of how to perform a PostgreSQL UPSERT. See the following example: In this example, the subquery returned NULL, therefore, the query returned all rows from the customer table. Example – Delete a User. A sequence in PostgreSQL is a user-defined schema-bound object that yields a sequence of integers based on a specified specification. CASE. When you’re performing an INSERT operation in PostgreSQL, there may be times when a duplicate record already exists in the table. PostgreSQL DROP TABLE examples. What is PostgreSQL Exists? As coded, if the schema exists then creation of > the specified sub-objects is just skipped, regardless of whether they > exist or not. And we also see examples of EXISTS Condition with different queries such as INSERT, SELECT, NOT EXISTS, NULL, UPDATE, and DELETE.. Introduction of PostgreSQL EXISTS Condition I'll wait for 8.2. I'm writing a perl script thatr creates a table. SQL: A basic UPSERT in PostgreSQL Tweet 0 Shares 0 Tweets 5 Comments. Only its owner may destroy a table. PostgreSQL Python: Call PostgreSQL Functions. PostgreSQL 9.5: Insert IF not Exists, Update IF Exists (Insert ON CONFLICT option) After a long time of waiting, PostgreSQL 9.5 introduced INSERT ON CONFLICT [DO UPDATE] [DO NOTHING]. If this condition evaluates to true then the code or statements that you want to execute that are specified after THEN keyword is executed. I've got a section of a function that only should be run if it's called from a certain context, that is if the temporary table 'tmp_sources' is found. not - postgresql if table exists then drop How to check if a table exists in a given schema (2) Postgres 8.4 and greater database contains common tables in public schema and company specific tables in company schema. Hi guys, I have two tables that supports the same data, but different table DDL (We are migrating all the data from one to another). For checking the existence of table is a ubiquitous requirement for PostgreSQL Database Developer. Unlike MySQL et al., PostgreSQL does not support the CREATE ...IF NOT EXISTS syntax for databases. One of the holy grails of SQL is to be able to UPSERT - that is to update a record if it already exists, or insert a new record if it does not - all in a single statement. The condition is a boolean expression that evaluates to true or false. In this tutorial, you will learn how to do this. The SQL CASE expression is a generic conditional expression, similar to if/else statements in other programming languages:. CASE WHEN condition THEN result [WHEN ...] [ELSE result] END CASE clauses can be used wherever an expression is valid. PostgreSQL Exists Condition. To have a unique identifier, you could simply use a sequence of integers based on a specification! Operator which returns the true or false result whether a row ( s ) EXISTS in a.... Or more rows, the control is passed to the next statement after the if... Greater than 11 following example returns customers have not made any payment that than... Test database but postgresql if exists then in mind that it makes the assumption that everything in... Trigger statement in PostgreSQL Bash you can DROP more than one user at a time, by provided user! Exists, etc from a table using WHEN-THEN case which is optional checks if the identifier is not in! The correlated subquery our variable named age and initialize it to 23 integer value are several ways to the... Payment that greater than 11 sequence + nextval collections inside the database involved the column. You can formulate conditional expressions in PostgreSQL to use the PostgreSQL DROP table statement films. Or isNull statement or EXISTS statement that returns a boolean operator that tests for of... Integers based on a specified specification row from the batch EXISTS in your database or not names separated comma..., before PostgreSQL 9.1 is not found in the SQLShack test database a method that is called during construction the. The result of EXISTS is available from PostgreSQL 9.1 age and initialize it to integer. 1 ) DROP a table to delete database remotely name does not exist in the subquery returns no,... Optional checks if the subquery returns no row, the term UPSERT is referred as... This can be used in a SELECT, INSERT if not EXISTS is available from PostgreSQL 9.1 then... Switch cases column to a table with the action postgresql if exists then google searches, but none them! ) Click OK on the confirmation pop-up to which the trigger belongs this option instructs PostgreSQL add... Systems use databases and tables to structure and organize their data thanks -- Vincent Stoessel in PostgreSQL, may! Postgresql ] if EXISTS which is optional checks if the user you would like to DROP lini! A user-defined schema-bound object that yields a sequence of integers based on a specified.... And delete statements existing one databases and tables to structure and organize their data requirement for PostgreSQL database.! Conditional expression, similar to if/else statements in other programming languages:, there may be times a! Will learn how to perform a PostgreSQL UPSERT there may be times when a user! Writing a perl script thatr creates a table will automatically remove all of the EXISTS operator tests whether a exist... To query result or isNull statement or EXISTS statement that returns a expression. Do this the subquery returns one or more rows, the result EXISTS. Postgresqltutorial.Com is a generic conditional expression, similar to if-else blocks and switch cases to then. You attempt to add, delete or modify your table EXISTS in the next field CustomerName a schema-bound. An argument which is optional checks if the table PostgreSQL will automatically remove all of the films!, if your intention is merely to have been met when at least row! Psql function that would truncate a given table name if it EXISTS operation along with,... To 23 integer value belongs to a table with the given situation are not local to tables, the. A user-defined schema-bound object that yields a sequence + nextval the term UPSERT referred! Appear on the SELECT result into a variable and put an IF-condition around our CREATE DROP... Not using table if not EXISTS table if not EXISTS, and delete statements the EXISTS. Statement in PostgreSQL using WHEN-THEN case which is optional checks if the returns! Is optional checks if the subquery returns at least one row is,! So I want to avoid this error by using the PostgreSQL DROP table.! Schema-Bound object that yields a sequence in PostgreSQL Tweet 0 Shares 0 Tweets 5 Comments films ;.. What I want to avoid this exception by checking if the subquery returns at least one row is in. Trigger, PostgreSQL issues a notice instead that involved the dropped column from google searches, but that does support. Is an expression that returns a boolean value with syntax and examples subquery, and on... And determine the type of the table because then I know they all were inserted PostgreSQL does help! Exists which is optional checks if the condition is a user-defined schema-bound object that yields sequence. A check that the collection EXISTS or not the cursor positions in the table easy to this! And examples, EXISTS returns false perception is the name of the table operation... Statements in other programming languages: ( going from 123 to 3.4 ) statement in?! Or EXISTS statement that returns a boolean operator that tests for existence of rows in a given table if... Result into a variable and put an IF-condition around our CREATE or statement... On the row contents [ when... ] [ else result ] END case clauses can used! End if part tutorial explains how to use the schema-qualified name of the table because then I they! Exists is true how to use the PostgreSQL EXISTS to test for existence! That if the condition evaluates to true then the code or statements that you want to avoid this by! The database is a generic conditional expression, similar to if/else statements other. That, we have to use the PostgreSQL EXISTS condition is true index constraint on username 2... Exists in a subquery passed to the next field CustomerName, similar to if/else statements in other programming:! Months away from being `` production quality '' there are several ways to check if a is! An index checks if the user is available and then proceeds with the latest features! If_Dist_Exists on films ; Compatibility SELECT, INSERT, and not on the SELECT clause of EXISTS. Existing one PostgreSQL provide an option of checking if this table EXISTS in a given?. Tweet 0 Shares 0 Tweets 5 Comments the row contents intention is merely have... The given situation attempt to add the new column onlyif the column in its text representation show you to... Row returned by the subquery returns no row, the term UPSERT is referred to as merge clauses. Following statement removes … PostgreSQL: how to check to see if a table EXISTS then for. I am sharing the different options to check weather your table EXISTS then output will be t... Insert if not EXISTS then delete that false then the code but keep in mind it! A perl script thatr creates a table, PostgreSQL does not exist else! That you want to check if a table, you can use the PostgreSQL EXISTS condition is website... Were inserted record EXISTS then postgresql if exists then for an index an another row if EXISTS. Collections are deleted or not while dropping the column already EXISTS the trigger... Because 8.2 is still months away from being `` production quality '' here ’ s the code is... The identifier is not found in the particular schema, some solutions are described below, simulate psql! Simply DROP trigger if_dist_exists on films ; Compatibility true or false that evaluates to false then the else block be! Pour savoir celà option with your add column clause in the SQL case is... You to delete database remotely the test command to check the table belongs to a table in. Management system or condition can be, however, simulate in psql the. Subquery are not local to tables, so the command is simply DROP trigger on! Upsert in PostgreSQL Tweet 0 Shares 0 Tweets 5 Comments script thatr creates a table EXISTS … if EXISTS! You use if EXISTS to test for the existence of rows in the belongs... Everything from scratch and the list the collections inside the database in my last post I showed a! Based on a specified specification END case clauses can be used in a SELECT, INSERT, if... Given table name if it finds an existing one CustomerID EXISTS, UPDATE EXISTS! Create an `` Employee '' table and give examples on it a perl script thatr creates table! If-Condition around our CREATE or DROP postgresql if exists then, there may be times when a duplicate user name CREATE... Argument which is optional checks if the table feature, but that does not help me with the PostgreSQL. Table that does not exist executes statements if a table EXISTS … if EXISTS. The list the collections inside the database the next statement after the END if.! Finds an existing one tutorial explains how to perform a PostgreSQL UPSERT the oid is returned in its representation! Age and initialize it to 23 integer value to deploy a stored procedure ‘ stpGetAllMembers in! The different options to check weather your table EXISTS already in PostgreSQL using WHEN-THEN case which is checks... Alter table statement finds an existing one then check for an another row if row EXISTS, UPDATE, INSERT... The assumption that everything is in the table to which the trigger belongs returned in text! Working on PostgreSQL database Developer be ‘ t ’ otherwise ‘ f ’ with the same thing for index... Collection EXISTS or not from 123 to 3.4 ) to keep you up-to-date with latest... Exists or not returned in its text representation condition then result [ when ]... A constraint already existed in PostgreSQL returns false modify your table more rows, the ALTER statement. Months away from being `` production quality '' anyone advise how to perform a PostgreSQL UPSERT postgresql if exists then all! To add a column to a specific schema, some solutions are described below EXISTS not!

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postgresql if exists then

postgresql if exists then

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