drop table 表名; go --创建表 create table 表名 ( --字段声明 列名int identity(1,1) not null, 列名nvarchar(50) null, 列名nvarchar(50) null constraint 约束名 check(约束规则), 列名nvarchar(50) null, 列名int, 列名int constraint 约束名 check(约束规则) primary key clustered(列名 asc) with(...
WITH NOCHECK ADD CONSTRAINT CK_约束名 CHECK (字段名 > num1 and 字段名 < num2); 补充:可以写成这种 ALTER TABLE 表名 WITH NOCHECK ADD CONSTRAINT CK_约束名 CHECK (字段名 in ('值1','值2','值3')); 方法三:用SQL脚本创建带有约束的表,这里参考了博文http://blog.csdn.net/fredrickhu/article...
constraint CHK_UserSex_MyUserInfo check ( UserSex= ' 男 ' or UserSex= ' 女 ' ), -- 用户名和电话号码按 DESC 排序组合是唯一的 constraint UQ_UserName_UserTel_MyUserInfo unique ( UserName desc , UserTel desc ), --constraint UQ_UserName_UserTel_MyUserInfo unique(UserName desc |asc,UserTel...
Uidintnotnullidentity(1,1)primarykey,--主键约束--Namevarchar(20)notnullunique,--唯一约束--Ageintnotnull,--检查约束--TeaUidintnotnullforeignkeyreferencesTeacher(Uid),--外键约束--Notesvarchar(100)null)--创建表后,新增检查约束--altertableStudentaddconstraintCK_Student_Agecheck(Age>=18)--年龄大于...
13 T-SQL为数据库表S创建CHECK约束 (1) 单击屏幕上方 “工具栏”菜单中的“新建查询”按钮,打开“查询编辑器”窗口,并在“查询编辑器”窗口中输入以下T-SQL语句: USEjxskGOALTERTABLESWITHCHECKADDCONSTRAINTCHECK_AGECHECK(AGE>=14ANDAGE<=40)GO```(2)将jxsk设置为当前数据库,单击“工具栏”中的“执行(x...
SQL CHECK on ALTER TABLE To create aCHECKconstraint on the "Age" column when the table is already created, use the following SQL: MySQL / SQL Server / Oracle / MS Access: ALTERTABLEPersons ADDCHECK(Age>=18); To allow naming of aCHECKconstraint, and for defining aCHECKconstraint on multi...
Remove CHECK Constraint We can remove theCHECKconstraint using theDROPclause. For example, SQL Server, PostgreSQL, Oracle -- remove CHECK constraint named amountCKALTERTABLEOrdersDROPCONSTRAINTamountCK; MySQL -- remove CHECK constraint named amountCKALTERTABLEOrdersDROPCHECKamountCK; ...
] referenced_table_name [ ( ref_column ) ] | CHECK ( logical_expression ) } <table_constraint> ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } { NONCLUSTERED ( column_name [ ASC | DESC ] [ ,... n ]) | NONCLUSTERED HASH ( column_name [ ,... n ] ) WITH ...
You can create a check constraint in a table to specify the data values that are acceptable in one or more columns in SQL Server by using SQL Server Management Studio or Transact-SQL. For more information on adding column constraints, see ALTER TABLE column_constraint. For more information, ...
table_name | schema_name.table_name | table_name } ( { <column_definition> | [ <table_constraint> ] [ ,... n ] | [ <table_index> ] [ ,... n ] } [ PERIOD FOR SYSTEM_TIME ( system_start_time_column_name , system_end_time_column_name ) ] ) [ WITH ( <table_option> [...