For more information, see SET QUOTED_IDENTIFIER (Transact-SQL). FOREIGN KEY REFERENCES Is a constraint that provides referential integrity for the data in the column. FOREIGN KEY constraints require that each value in the column exist in the specified column in the referenced table. schema_name ...
Applies to: SQL Server 2008 (10.0.x) and later. Can be specified for FOREIGN KEY constraints and CHECK constraints. If this clause is specified for a constraint, the constraint is not enforced when replication agents perform insert, update, or delete operations. ...
兼容性视图 (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 (Transact-SQL) CONSTRAINT_TABLE_...
但是如果表上需要添加Constraints或者工作负载仍然需要B-tree形式的非聚集索引,那么我们还是只能考虑使用非聚集列存储索引。 语句的执行上有以下改进 基于矢量的计算方式得到改 支持更多的语法 所有的join方式(包括OUTER, HASH, SEMI (NOT IN, IN) UNION ALL Scalar aggregates “Mixed mode” plans 对bitmap和spill...
Applies to: SQL Server 2016 (13.x) and later, SQL Database. Must be 'AEAD_AES_256_CBC_HMAC_SHA_256'.For more information including feature constraints, see Always Encrypted (Database Engine).ADD MASKED WITH ( FUNCTION = ' mask_function ') Applies to: SQL Server 2016 (13.x) and lat...
Documenting WITH FILLFACTOR =fillfactoras the only index option that applies to PRIMARY KEY or UNIQUE constraints is maintained for backward compatibility, but will not be documented in this manner in future releases. Other index options can be specified in theindex_option (Transact-SQL)clause of ...
CONSTRAINT_NAME nvarchar(128) 约束名称。 请参阅 参考 系统视图 (Transact-SQL) 信息架构视图 (Transact-SQL) sys.columns (Transact-SQL) sys.objects (Transact-SQL) sys.types (Transact-SQL) sys.check_constraints (Transact-SQL) sys.key_constraints (Transact-SQL) sys.foreign_keys (Transact-SQL)中文...
The Database Engine does not enforce an order for specifying DEFAULT, IDENTITY, ROWGUIDCOL, or column constraints in a column definition. Examples For examples, see ALTER TABLE (Transact-SQL). See Also Reference ALTER TABLE (Transact-SQL) Concepts Controlling Constraints, Identities, and Triggers...
(table check constraints). Both types of check constraint produce the same result when the statement is issued, and you can specify any valid check condition as either type. However, you might prefer to use table check constraints for check conditions that would violate the SQL standard (not ...
SQL Server Unique constraint for values in different columnI agree 100% with the above comments ...