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Also, SQL Server does not allow remove column having PRIMARY KEY and FOREIGN KEY constraint. Please note that if you want to delete a column having a CHECK constraint, you must first remove the constraint before removing the column. ALTER TABLE table_nameĭROP COLUMN column_name_1, column_name_2,… The following syntax will remove multiple columns using a single ALTER TABLE statement by specifying the column names by comma-separated.
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DROP COLUMN SQL SERVER HOW TO
The UPDATE of the new column must be done with dynamic SQL because we’re adding the column in the very same script and SQL Server tries to validate script before the execution and it doesn’t find the column and gives an error.The objective of this SQL Server tutorial is to teach you how to use SQL Server ALTER TABLE DROP Column to remove one or more columns from the existing table. () PRINT 'IDENTITY removed successfully' END TRY BEGIN CATCH IF TRANCOUNT > 0 ROLLBACK TRANSACTION PRINT 'ERROR:' + ERROR_MESSAGE () END CATCH IF TRANCOUNT > 0 COMMIT TRANSACTION WITH NOCHECK ADD CONSTRAINT FOREIGN KEY () REFERENCES. AddressType ADD CONSTRAINT PRIMARY KEY CLUSTERED ( ASC ) - Enable constraints (without rechecking them) ALTER TABLE. AddressType DROP COLUMN - Rename column ID_EXENCION_NEW -> ID_EXENCION EXEC sp_rename '_AddressTypeID', 'AddressTypeID', 'COLUMN' - Add new Primary Key ALTER TABLE Person. AddressType DROP CONSTRAINT - Drop IDENTITY column ALTER TABLE Person. DROP CONSTRAINT - Drop Primary Key ALTER TABLE Person. AddressType ALTER COLUMN INT NOT NULL - Disable Foreign Keys Constraints ALTER TABLE. AddressType ADD INT NULL - Updating the new column with the values sorted as we want EXEC sp_executesql N 'UPDATE Person.AddressType SET = AddressTypeID' - Setting the new column as NOT NULL ALTER TABLE Person.
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SET NOCOUNT ON BEGIN TRANSACTION BEGIN TRY - Adding a new temporary column ALTER TABLE Person. The script is, as explained before, inside a transactions and the looks like this: In our example, it’s important to note that the Person.AdressType has references to two tables: NOT NULL, ROWGUIDCOL NOT NULL CONSTRAINT DEFAULT ( newid ()), NOT NULL CONSTRAINT DEFAULT ( getdate ()), NOT NULL, CONSTRAINT PRIMARY KEY CLUSTERED ( ASC )) ON NOT NULL, ROWGUIDCOL NOT NULL CONSTRAINT DEFAULT ( newid ()), NOT NULL CONSTRAINT DEFAULT ( getdate ()), CONSTRAINT PRIMARY KEY CLUSTERED ( ASC )) ON - The result after removing the IDENTITY property: CREATE TABLE.
DROP COLUMN SQL SERVER CODE
When there’s a table with a primary key that is an IDENTITY and you want to remove the IDENTITY property, there’s no simple SQL code to do it.