![]() If the column contains constraints or other dependencies, an error message will be returned. ALTER TABLE dbo.doc_exb DROP COLUMN column_b DROP COLUMN MYSQL HOW TOThe 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 will display in the Delete Object dialog box. Right-click the column that you want to delete, and choose Delete.In Object Explorer, locate the table from which you want to delete columns, and expand to expose the column names.In Object Explorer, connect to an instance of Database Engine.The following steps explain how to delete columns with Object Explorer in SSMS: When using Object Explorer or Transact-SQL, you must first remove all dependencies on the column. 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. You can't delete a column that has a CHECK constraint. When you delete a column from a table, the column and all the data it contains are deleted. ![]()
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