SQL Server supports the following classes of constraints: NOT NULL specifies that the column does not accept NULL values. For more information, seeAllowing Null Values. CHECK constraints enforce domain integrity by limiting the values that can be put in a column. For more information, seeCHECK C...
SQL Server supports the following classes of constraints: NOT NULL specifies that the column does not accept NULL values. For more information, seeAllowing Null Values. CHECK constraints enforce domain integrity by limiting the values that can be put in a column. For more information, seeCHECK C...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft FabricThis article describes how to disable an index or constraints in SQL Server by using SQL Server Management Studio or Transact-SQL. Disabling an index prevents user access to the index, and for...
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兼容性视图 (Transact-SQL) 数据层应用程序视图 (Transact-SQL) 动态管理视图和函数 (Transact-SQL) 信息架构视图 (Transact-SQL) 信息架构视图 (Transact-SQL) CHECK_CONSTRAINTS (Transact-SQL) COLUMN_DOMAIN_USAGE (Transact-SQL) COLUMN_PRIVILEGES (Transact-SQL) COLUMNS (Transact-SQL) CONSTRAINT_COLUMN_USAGE...
How to Implement Constraints in SQL? Types of Constraints in SQL Conclusion Watch this Video on MS SQL Tutorial for Beginners What are the Constraints in SQL? Constraints in SQL are rules you can set to control the data inserted or updated in a table. These specific rules ensure that the ...
EXEC sp_executesql @create; */ Conclusion I will be the first to admit: the script is a lot to digest. However, before trying to completely reverse engineer all of the logic on first glance, I urge you to try this code (with theEXEClines still commented out of course) in your ...
The following example returns all constraints in the database and orders the rows by CONSTRAINT_TYPE. SQL Copy USE AdventureWorks; GO SELECT * FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS ORDER BY CONSTRAINT_TYPE; See Also Reference System Views (Transact-SQL) Information Schema Views (Transact-SQL...
Returns one row for each table constraint in the current database. This information schema view returns information about the objects to which the current user has permissions.To retrieve information from these views, specify the fully qualified name of **INFORMATION_SCHEMA.**view_name.Expand...
<Columns inherited from sys.objects> For a list of columns that this view inherits, see sys.objects (Transact-SQL). unique_index_id int ID of the corresponding unique index in the parent object that was created to enforce this constraint. is_system_named bit 1 = Name was generated by sys...