Resolve the error by deleting the referenced constraints.įor more examples, see ALTER TABLE (Transact-SQL). If the column contains constraints or other dependencies, an error message will be returned. ALTER TABLE dbo.doc_exb DROP COLUMN column_b ![]() The following example shows you how to delete a column. You can delete columns using Transact-SQL in SSMS, Azure Data Studio, or command-line tools such as the sqlcmd utility. If the column participates in a relationship (FOREIGN KEY or PRIMARY KEY), a message prompts you to confirm the deletion of the selected columns and their relationships.Right-click the column you want to delete and choose Delete Column from the shortcut menu.In Object Explorer, right-click the table from which you want to delete columns and choose Design.The following steps explain how to delete columns with Table Designer in SSMS: Resolve the error by deleting the referenced constraints. If the column contains constraints or other dependencies, an error message displays in the Delete Object dialog box. In the Delete Object dialog box, click OK.In this case, the columns default value reverts to the. Right-click the column that you want to delete, and choose Delete. To drop a default value, use ALTER colname DROP DEFAULT : ALTER TABLE mytbl ALTER j DROP DEFAULT.In Object Explorer, locate the table from which you want to delete columns, and expand the table to expose the column names.Connect to an instance of Database Engine.The following steps explain how to delete columns with Object Explorer in SSMS: When using Object Explorer in SSMS or Transact-SQL, you must first remove all dependencies on the column. You can also change characteristics such as the storage engine used for the table or the table comment. For example, you can add or delete columns, create or destroy indexes, change the type of existing columns, or rename columns or the table itself. You can't delete a column that has PRIMARY KEY or FOREIGN KEY constraints or other dependencies except when using the Table Designer in SSMS. ALTER TABLE changes the structure of a table. You can't delete a column that has a CHECK constraint. The ALTER TABLE DROP COLUMN statement allows you to delete a column from. ![]() ![]() When you delete a column from a table, the column and all the data it contains are deleted. In some cases, we may want to remove a single column or multiple columns from a table.
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