Use SQL Server Management Studio Use Transact-SQL Next steps Applies to: SQL Server 2016 (13.x) and later Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL database in Microsoft Fabric You can disable a foreign key constraint during INS...
Use SQL Server Management StudioTo disable a foreign key constraint for replicationIn Object Explorer, expand the table with the foreign key constraint you want to modify, and then expand the Keys folder. Right-click the foreign key constraint and then select Modify. In the Foreign Key...
You can disable a foreign key constraint during INSERT and UPDATE transactions in SQL Server by using SQL Server Management Studio or Transact-SQL. Use this option if you know that new data will not violate the existing constraint or if the constraint applies only to the data a...
--删除主键 alter table 表名 drop constraint 主键名 --添加主键 alter table 表名 add constraint 主键名 primary key(字段名1,字段名2……) 1. 2. 3. 4. 2、Foreign Key约束 外键约束是用来加强两个表(主表和从表)的一列或多列数据之间的连接的。创建外键约束的顺序是先定义主表的主键,然后定义从表...
如需命名 FOREIGN KEY 约束,并定义多个列的 FOREIGN KEY 约束,请使用下面的 SQL 语法: MySQL / SQL Server / Oracle / MS Access: ALTERTABLE表名ADDCONSTRAINT外键约束名FOREIGNKEY(column1, column2,...column_n)REFERENCES外键所依赖的表 (column1,column2,...column_n)ONDELETECASCADE;--级联删除 ...
在脚本的ALTER TABLE ... ADD CONSTRAINT部分,修改新的外键约束并指定 NOT FOR REPLICATION 选项。 例如: SQL ALTERTABLE[Sales].[SalesTerritoryHistory]DROPCONSTRAINT[FK_SalesTerritoryHistory_SalesPerson_BusinessEntityID]GOALTERTABLE[Sales].[SalesTerritoryHistory]WITHCHECKADDCONSTRAINT[FK_SalesTerrit...
disable constraint new_pk_userid; 1. 2. 6、删除主键约束 (1)主键约束有名字 alter table sys_user drop constraint new_pk_userid; 1. 2. (2)主键约束没有名字: alter table sys_user_p drop primary key; 1. 2. 三、外键约束 1、在创建表时设置外键约束 ...
SQL Server / Oracle / MS Access: CREATETABLEOrders ( OrderID intNOTNULLPRIMARYKEY, OrderNumber intNOTNULL, PersonID intFOREIGNKEYREFERENCESPersons(PersonID) ); To allow naming of aFOREIGN KEYconstraint, and for defining aFOREIGN KEYconstraint on multiple columns, use the following SQL syntax: ...
字段定义constraint 约束名约否类型(字段名)-->unique,primarykey,check字段定义constraint 约否名foreingnkey(字段名)references表名(字段名)--->foreign三、建表时约束定义1.定义各种不同的约束--创建一个用于作外键的表tb_deptSQL>CREATETABLEtb_dept ...
Foreign Key Syntax in SQL The syntax of the SQLFOREIGN KEYconstraint is: CREATE TABLE table_name ( column1 data_type, column2 data_type, ..., FOREIGN KEY (column_name) REFERENCES referenced_table_name (referenced_column_name) );