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    sql drop database if exists postgresql select data based on date value

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  1. 28 Απρ 2015 · I'm trying to drop a table on startup based on a condition: IF NOT EXISTS (select * from pg_class where relname = 'mytable' and relpersistence = 'u') DROP TABLE IF EXISTS mytable. Result: Syntaxerror at 'IF', SQL state: 42601.

  2. 26 Σεπ 2024 · DROP DATABASE drops a database. It removes the catalog entries for the database and deletes the directory containing the data. It can only be executed by the database owner. It cannot be executed while you are connected to the target database.

  3. 1 Απρ 2024 · DROP DATABASE IF EXISTS my_database; In this example, the DROP DATABASE statement with the IF EXISTS clause is used to drop a database named my_database. If the my_database database is there, it will be dropped; if it doesn’t exist, the statement will be avoided.

  4. Synopsis. DROP DATABASE [ IF EXISTS ] name [ [ WITH ] ( option [, ...] ) ] where option can be: . FORCE. Description. DROP DATABASE drops a database. It removes the catalog entries for the database and deletes the directory containing the data. It can only be executed by the database owner.

  5. 27 Ιουν 2017 · I've found only SELECT datname FROM pg_catalog.pg_database WHERE datname='dbname', but this is a CS check. The first thing that comes to mind to retrieve all db names and filter them by hand, but I think there is more elegant way to do it.

  6. 4 Ιαν 2024 · Execute the DROP DATABASE command with the CASCADE clause. The SQL statement: DROP DATABASE IF EXISTS database_name CASCADE; Advantages: Removes dependent objects, avoiding leftover orphans.

  7. dropdb is a wrapper around the SQL command DROP DATABASE. There is no effective difference between dropping databases via this utility and via other methods for accessing the server. Options. dropdb accepts the following command-line arguments: dbname. Specifies the name of the database to be removed. -e. --echo.

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    sql drop database if exists postgres select data based on date value in table