我怎样才能写检查约束
How can i write check constraint
我如何为一列写检查约束说 class_id 其中检查条件应该是：字符串以 CLS 开头，后跟任何 5 位数字。
例如：CL100987、CLS45678
try using regex
类似的东西
WHERE REGEXP_LIKE (COLUMN_CONDITION,'^CLS.*([0-9]{5})');
| REGEXP_LIKE -> like specific to regex | column_condition ->
explicit | '^**." -> start with and followed by any char |
([0-9]) - > only numerics | {5} -> the number of numerics in the
expression
pay attention to your dbms, some differences
hope this could help
我如何为一列写检查约束说 class_id 其中检查条件应该是：字符串以 CLS 开头，后跟任何 5 位数字。
例如：CL100987、CLS45678
try using regex
类似的东西
WHERE REGEXP_LIKE (COLUMN_CONDITION,'^CLS.*([0-9]{5})');
| REGEXP_LIKE -> like specific to regex | column_condition -> explicit | '^**." -> start with and followed by any char | ([0-9]) - > only numerics | {5} -> the number of numerics in the expression
pay attention to your dbms, some differences hope this could help