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22 Φεβ 2017 · Using Exists statement to delete data from table: IF EXISTS(SELECT 1 FROM Your_table WHERE user_id = user_id) BEGIN DELETE FROM Your_table WHERE user_id= user_id END Delete table from database : IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'TheSchema' AND TABLE_NAME = 'TheTable') BEGIN --Your delete statement END
To remove an existing user-defined function created by the CREATE FUNCTION statement, you use the DROP FUNCTION statement as follows: DROP FUNCTION [ IF EXISTS ] [ schema_name. ] function_name; Code language: SQL (Structured Query Language) (sql) In this syntax:
To remove an existing database from a SQL Server instance, you use the DROP DATABASE statement. The DROP DATABASE statement allows you to delete one or more databases with the following syntax: DROP DATABASE [ IF EXISTS ] database_name [,database_name2,...];
22 Αυγ 2016 · Create new database object. The new DROP IF EXISTS syntax replaces the old block of code that used system catalog views to determine the existence of an object. Basically, the new syntax combines steps one and two into a smaller set of code to produce the same results.
27 Νοε 2020 · SQL Server 2016 has released an optional IF EXISTS clause with DROP statement that can be used as DROP IF EXISTS. DROP IF EXITS verify if an object exists then drops an existing object and recreate an object else continues executing specified T-SQL code.
The IF EXISTS option allows you to conditionally drop a stored function if it exists. It prevents an error from arising if the function does not exist. MySQL DROP FUNCTION example. We’ll use the orders table in the sample database for the demonstration:
The SQL DROP DATABASE Statement. The DROP DATABASE statement is used to drop an existing SQL database. Syntax. DROP DATABASE databasename; Note: Be careful before dropping a database. Deleting a database will result in loss of complete information stored in the database! DROP DATABASE Example.
