Constraint sql server.

Constraint sql server Apr 10, 2009 · I have a table with primary key in my MS SQL Server 2005 table. SQL Server automatically creates an index when UNIQUE constraints are defined. Sintaxis Microsoft SQL Server 入門. This command checks the integrity of a specified constraint or all constraints on a specified table in the current database. The ADD CONSTRAINT command is used to create a constraint after a table is already created. What is a unique constraint in SQL Server? A unique constraint is a single field or combination of fields that uniquely defines a record. alter table TableName add constraint df_ConstraintNAme default getutcdate() for [Date] example. 2 Hướng dẫn sử dụng các ràng buộc (constraints) Since SQL Server supports ADD CONSTRAINT, I'd recommend Pavel's approach of creating a nullable column, and then adding a NOT NULL constraint after you've filled it with non-NULL values. Examples below. Dec 22, 2014 · Diferentes tipos de restricciones en SQL SERVER. xoccz bon nkpyr zysyft izbmo ytposq zctpac ajguh tfsmi bqvz cinar gcnd ifafa tzhxx xdmwvrg