TABLE_CATALOG nvarchar(128) 數據表限定符。 TABLE_SCHEMA nvarchar(128) 包含數據表的架構名稱。 重要: 尋找物件架構的唯一可靠方式是查詢 sys.objects 目錄檢視。 TABLE_NAME sysname 資料表名稱。 CONSTRAINT_TYPE varchar(11) 條件約束的類型: CHECK UNIQUE PRIMARY KEY FOREIGN KEY IS_DEFERR...
本文转自:https://stackoverflow.com/questions/14229277/sql-server-2008-get-table-constraints You should use the currentsyscatalog views (if you're on SQL Server2005or newer - thesysobjectsviews aredeprecatedand should be avoided) - check out theextensive MSDN SQL Server Books Online documentation ...
Article for:SQL Server▾ Query below lists all table (and view) constraints - primary keys, unique key constraints and indexes, foreign keys and check and default constraints. Query selecttable_view, object_type, constraint_type, constraint_name, detailsfrom(selectschema_name(t.schema_id) +'...
When FOREIGN KEY or CHECK constraints are added, all existing data is verified for constraint violations unless the WITH NOCHECK option is specified. If any violations occur, ALTER TABLE fails and an error is returned. When a new PRIMARY KEY or UNIQUE constraint is added to an existing column...
publicvoidAddUniqueConstraint(stringtableName,stringcolumnName){stringquery=$"ALTER TABLE{tableName}ADD CONSTRAINT UQ_{columnName}UNIQUE ({columnName})";// 执行 SQL 语句} 1. 2. 3. 4. 5. 生态集成 在考虑生态集成时,我制作了类图和扩展模块的关系图,以确保新约束在整体架构中的合理性: ...
SQL Server 2022 (16.x) introduces resumable operations for adding table constraints for primary key and unique key constraints. For more information on enabling and using resumableALTER TABLE ADD CONSTRAINToperations, seeResumable add table constraints. ...
CREATE TABLE bought ( PurchaseCount INT , CONSTRAINT EC_BOUGHT CONNECTION (Customer TO Product, Supplier TO Product) ) AS EDGE; -- Query sys.edge_constraints and sys.edge_constraint_clauses to view -- edge constraint properties. SELECT EC.name AS edge_constraint_name , OBJECT_NAME(EC.parent...
You can also add check constraints to a table after a table exists using the ALTER TABLE syntax. The following constraint will ensure an employee date of hire is always in the past by using the system function GETTIME. CREATE TABLE Employees_2 ...
You can validate the NOT NULL constraints using the SSMS table designer as well. UNIQUE constraint The UNIQUE constraint in SQL Server ensures that you do not have duplicate values in a single column or combination of columns. These columns should be part of the UNIQUE constraints. SQL Server ...
These constraints create indexes. If filegroup is specified, the index is stored in the named filegroup. If "default" is specified, or if ON isn't specified at all, the index is stored in the same filegroup as the table. If the PRIMARY KEY or UNIQUE constraint creates a clustered index,...