In this article, you will learn about Computed Columns inSQL Server. A computed column is computed from an expression that can use other columns in the same table. The expression can be a non-computed column name, constant, function, and any combination of these connected by one or more op...
| column_name AS computed_column_expression } [ ,...n ] | [ WITH CHECK | WITH NOCHECK ] ADD { < table_constraint > } [ ,...n ] | DROP { [ CONSTRAINT ] constraint_name | COLUMN column } [ ,...n ] | { CHECK | NOCHECK } CONSTRAINT { ALL | constraint_name [ ,...n ] ...
SERVER ROLE SERVICE サービス マスター キー SYMMETRIC KEY TABLE TABLE column_constraint TABLE column_definition TABLE computed_column_definition TABLE index_option TABLE table_constraint トリガー User VIEW ワークロード グループ XML スキーマ コレクション バックアップと復元 創造する 照合順...
SQL Server Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft Fabric Specifies the properties of a computed column that is added to a table by usingALTER TABLE. Transact-SQL syntax conventions Syntax syntaxsql column_nameAScomputed_column_expression[PERSISTED[NOTNULL] ] [ [CO...
The hint prevents the optimizer from considering any spatial or XML indexes on the table. The hint can't be specified in combination with the FORCESCAN hint. For partitioned indexes, the partitioning column implicitly added by SQL Server can't be specified in the FORCESEEK hint. Caution Specify...
| <computed_column_definition> | <table_constraint> } [ ,...n ] | DROP { [ CONSTRAINT ] constraint_name [ WITH ( <drop_clustered_constraint_option> [ ,...n ] ) ] | COLUMN column_name } [ ,...n ] | [ WITH { CHECK | NOCHECK } ] { CHECK | NOCHECK } CONSTRAINT ...
The hint prevents the optimizer from considering any spatial or XML indexes on the table. The hint can't be specified in combination with theFORCESCANhint. For partitioned indexes, the partitioning column implicitly added by SQL Server can't be specified in theFORCESEEKhint. ...
The easiest way to migrate from a parent/child structure to a table using hierarchyid is to use a temporary column or a temporary table to keep track of the number of nodes at each level of the hierarchy. For an example of migrating a parent/child table, see lesson 1 of Tutorial: ...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Specifies the properties of a PRIMARY KEY, FOREIGN KEY, UNIQUE, or CHECK constraint that is part of a new column definition added to a table by using ALTER TABLE. הערה For Microsoft Fabric, visit ALTER TABLE ...
Defines the table data type for a Transact-SQL function. The table declaration includes column definitions and column or table constraints. The table is always put in the primary filegroup. <clr_table_type_definition> ( { column_namedata_type } [ , ...n ] ) Applies to: SQL Server 2008...