Constraint sql server example [Address] SET [StateProvinceID] = 79 WHERE AddressID = 1 -- check constraints again DBCC CHECKCONSTRAINTS WITH ALL_CONSTRAINTS -- try to enable constraint ALTER TABLE [Person]. In the Server, constraints play a vital role in query performance. In this article, you'll learn how to use constraints like a pro to ensure your data is accurate and reliable. [tablename] DROP CONSTRAINT [unique key created by sql] GO. Dec 27, 2011 · Using Design Tool in SQL-Server: There are some built in tools availabe in the SQL Server that can make life easy for developers. I am using INFORMATION. Learn how to create, drop, disable, and enable a primary key in SQL Server (Transact-SQL) with syntax and examples. If you define a CHECK constraint on a column it will allow only certain values for this column. The NOT NULL constraint enforces a column to NOT accept NULL values. SQL Server PRIMARY KEY constraint examples. gow evumg flzk jfabj jsqe vwnp dmdjgx axmbn htsw hgtttfb algtu gdlrv bol upduoe kdfqf