CONSTRAINT check_constraint_nameCHECK(expression);Code language:SQL (Structured Query Language)(sql) When a check constraint is on the same line as the table column, its syntax is called in-line constraint. Alternatively, you can can define a check constraint using a table constraint syntax: CRE...
SQL Server / Oracle / MS Access: CREATETABLEPersons ( ID intNOTNULL, LastName varchar(255)NOTNULL, FirstName varchar(255), Age intCHECK(Age>=18) ); To allow naming of aCHECKconstraint, and for defining aCHECKconstraint on multiple columns, use the following SQL syntax: ...
Oracle中没有Boolean类型,PL/SQL有Boolean类型.为了替代一个boolean列使用check约束 CREATE TABLE temp(enabled NUMBER(1) NOT NULL); ALTER TABLE temp ADD CONSTRAINT ck_temp_enabled CHECK (enabled IN (0, 1)); 也可以使用varchar2类型 CREATE TABLE temp(enabled VARCHAR2(1) NOT NULL); ALTER TABLE temp...
相反,我们可以使用Liquibase工具中的'addCheckConstraint'来模拟实现ENUM列的功能。 'addCheckConstraint'是Liquibase中的一个命令,用于向数据库表中添加检查约束。通过使用'addCheckConstraint'命令,我们可以创建一个检查约束,限制某一列只能接受特定的枚举值。 使用Liquibase 'addCheckConstraint'来模拟ENUM列...
oracle保存报错check constraint (NVPOLICY.RULE_18) violated 这是在往oralce数据库插入数据时报的错误,经查询是违反了检查约束。 查询此表的约束: select * from user_constraints where table_name='表名' 1. 这是其中一条数据,也是我违反的约束的数据。列constraint_name值为NVPOLICY.RULE_18(表名.此列名),...
CHECK Constraint Syntax The syntax of the SQLCHECKconstraint is: CREATETABLEtable_name ( column_name data_typeCHECK(condition) ); Here, table_nameis the name of the table to be created column_nameis the name of the column where the constraint is to be implemented ...
Oracle中没有Boolean类型,PL/SQL有Boolean类型.为了替代一个boolean列使用check约束 CREATE TABLE temp(enabled NUMBER(1) NOT NULL); ALTER TABLE temp ADD CONSTRAINT ck_temp_enabled CHECK (enabled IN (0, 1)); 也可以使用varchar2类型 CREATE TABLE temp(enabled VARCHAR2(1) NOT NULL); ...
SQL> select column_name ,nullable from user_tab_cols where table_name='TT'; COLUMN_NAME NUL --- --- TABLE_NAME N TABLE_TYPE N SQL> select constraint_name,constraint_type,search_condition from user_constraints where table_name='TT'; CONSTRAINT_NAME CON SEARCH_CONDITION --- --- --- ...
MySQL / SQL Server / Oracle / MS Access: ALTER TABLE Persons ADD CHECK (P_Id>0) 如需命名 CHECK 约束,并定义多个列的 CHECK 约束,请使用下面的 SQL 语法: MySQL / SQL Server / Oracle / MS Access: ALTER TABLE Persons ADD CONSTRAINT chk_Person CHECK (P_Id>0 AND City='Sandnes') ...
CREATE TABLE permits the core features of table and column CHECK constraints, for all storage engines. CREATE TABLE permits the following CHECK constraint syntax, for both table constraints and column constraints: [CONSTRAINT [symbol]] CHECK (expr) [[NOT] ENFORCED] ...