ALTERTABLE[IFEXISTS]table_name {ADD{<schema_component>|(<schema_component>[,...])}|MODIFY{<schema_component>|(<schema_component>[,...])}|DROP{column_name|(column_name,column_name,...)|PRIMARYKEY|CONSTRAINTconstraint_name|WATERMARK}|RENAMEold_column_nameTOnew_column_name|RENAMETOnew_table_...
Represents a DROP COLUMN MASTER KEY statement C# 复制 [System.Serializable] public class DropColumnMasterKeyStatement : Microsoft.SqlServer.TransactSql.ScriptDom.DropUnownedObjectStatement Inheritance Object TSqlFragment TSqlStatement DropUnownedObjectStatement DropColumnMasterKeyStatemen...
We cannot remove a column with a CHECK constraint in the table. If we want to drop a column with constraints, we first remove the constraint.SQL Serverdoes not drop a column with PRIMARY or FOREIGN KEY constraints or other dependencies. However, we can do this by using the Table Designer....
The syntax of the SQLDROP TABLEstatement is: DROPTABLEtable_name; Here,table_nameis the name of the table to be removed. Note:When we delete a database table, all records within the table are also deleted. DROP TABLE IF EXISTS
Learn more about the Microsoft.SqlServer.Management.SqlParser.SqlCodeDom.SqlDropSchemaStatement in the Microsoft.SqlServer.Management.SqlParser.SqlCodeDom namespace.
SQL Server ALTER COLUMN Operations – Add Column Joe Gavin Joe Gavin is from Greater Boston and has worked in technology as a Field Service Engineer for an automotive dealer computer system vendor, a Technical Consultant and Operations Analyst with Sybase and SQL Server based database applications ...
Syntax of a SQL DELETE StatementDELETE FROM table_name [WHERE condition]; table_name -- the table name which has to be updated.NOTE: The WHERE clause in the sql delete command is optional and it identifies the rows in the column that gets deleted. If you do not include the WHERE ...
SQL DROP DATABASE Statement In SQL, DROP DATABASE is used to delete a database from our Database Management System. Example DROP DATABASE my_database; Here, the SQL command will delete a database named my_database. Also, you need admin or DROP permission to run this command. DROP DATA...
Another way to rename a column is to use the RENAME statement together with the CREATE TABLE statement with AS subquery. This method is useful is you are changing the structure of a table rather than only renaming a column. The following statements re-create the sample table hr.job_history,...
When operating on a single row, a DML statement with areturning_clausecan retrieve column expressions using the affected row, rowid, andREFsto the affected row and store them in host variables or PL/SQL variables. When operating on multiple rows, a DML statement with thereturning_clausestores ...