TABLE_CONSTRAINTS (Transact-SQL) 發行項 2025/01/03 11 位參與者 意見反應 適用於:SQL Server Azure SQL 資料庫 Azure SQL 受控執行個體針對目前資料庫中的每個數據表條件約束,各傳回一個數據列。 這項資訊架構檢視會傳回目前使用者具有許可權之對象的相關信息。
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: 使用Databas...
[转]SQL Server 2008- Get table constraints 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 theextensiv...
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...
TABLE_SCHEMAnvarchar(128)Name of schema that contains the table. Important:The only reliable way to find the schema of an object is to query thesys.objectscatalog view. TABLE_NAMEsysnameTable name. CONSTRAINT_TYPEvarchar(11)Type of constraint: ...
SQL Server / Oracle / MS Access: CREATETABLEPersons(Id_PintNOTNULLUNIQUE,LastNamevarchar(255)NOTNULL,FirstNamevarchar(255),Addressvarchar(255),Cityvarchar(255)) 1. 2. 3. 4. 5. 6. 7. 8. 如果需要命名 UNIQUE 约束,以及为多个列定义 UNIQUE 约束,请使用下面的 SQL 语法: ...
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,...
Applies to: SQL Server 2008 R2 (10.50.x) and later. Azure SQL Database and Azure SQL Managed Instance do not support FILESTREAM. Specifies the filegroup for FILESTREAM data. If the table contains FILESTREAM data and the table is partitioned, the FILESTREAM_ON clause must be included, and mu...
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,...