Development languages Topics Sign in We're no longer updating this content regularly. Check the Microsoft Product Lifecycle for information about how this product, service, technology, or API is supported. Return to main site Search Syntax error in CHECK CONSTRAINT clause. (Error 3765)Learn...
ALTER TABLE example_table ADD CONSTRAINT chk_created_at CHECK (created_at IS NOT NULL AND created_at ~ '^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$'); 注意:上面的正则表达式是一个简单的示例,可能不足以涵盖所有有效的 timestamp 格式。在实际应用中,你可能需要使用更复杂的正则表达式或...
Syntax:INTERNAL layer1 layer2 constraint[NOT] PERPENDICULAR [ONLY|ALSO] You must order the words within a secondary keyword as shown in the syntax for the statement. For example, the following three statements are valid: 关键字和语句是语法中固定顺序的,ONLY 是指定只测量垂直边,ALSO 是 指定测量...
> ALTER TABLE MyTableName ADD CONSTRAINT Check ( ( MyfieldName > 0 ) AND ( MyFieldName < 3500 ) ) 1. You have to specify a name for the constraint. 2. You have to use ADO to add a Check constraint. The VBA code could look like this: CurrentProject.Connection.Execute "ALTER TABLE...
在这个示例中,CONSTRAINT check_age CHECK (age > 0 AND age <= 120) 是用来创建名为 "check_age" 的 CHECK 约束。这个约束确保了在插入或更新数据时,age 列的值必须大于 0 并且小于等于 120。 现在来解释一下 CONSTRAINT。在上面的示例中,CONSTRAINT check_age 表示我们正在定义一个约束,并将其命名为 "ch...
Check condition:check Constraint with the condition. Example CREATE TABLE EMP_TEST (ID INT PRIMARY KEY NOT NULL, NAME TEXT NOT NULL, SALARY REAL CHECK(SALARY > 1000)); INSERT into EMP_TEST (ID, NAME, SALARY) VALUES (1, 'ABC', 5000); ...
CATALOG CHAR CHARACTER CHECK CLASS CLOB CLOSE COLLATE COLLATION COLLECT COLUMN COMMIT COMPLETION CONDITION CONNECT CONNECTION CONSTRAINT CONSTRAINTS CONSTRUCTOR CONTAINS CONTINUE CORRESPONDING CREATE CROSS CUBE CURRENT CURRENT_DATE CURRENT_PATH CURRENT_ROLE CURRENT_TIME CURRENT_TIMESTAMP CURRENT_USER CURSOR CYCLE...
For both cases, it should only be declared as a singleton. If you define multiple primary key constraints at the same time, an exception would be thrown. Validity Check SQL standard specifies that a constraint can either be ENFORCED or NOT ENFORCED. This controls if the constraint checks are...
Check Constraint on decimal: restrict user to enter more than 1 digit Check date format is dd/mm/yyyy Check for Null Value or Spaces check for the existence of multiple columns in a table Check for valid Ip address Check if amount is positive or negative Check If Column Is PRIMARY KEY Ch...
Create Table Statement CREATE TABLE "table_name" ("column 1" "data type for column 1" [column 1 constraint(s)], "column 2" "data type for column 2" [column 2 constraint(s)], ... [table constraint(s)]);Drop Table Statement DROP TABLE "table_name";...