You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
11 lines
473 B
11 lines
473 B
2 months ago
|
-- 第1 步：先加字段，允许 NULL，不设默认值
|
||
|
|
ALTER TABLE enforcement_registration
|
||
|
|
ADD COLUMN update_time DATETIME NULL;
|
||
|
|
|
||
|
|
-- 第 2 步：用 create_time 填充已有行
|
||
|
|
UPDATE enforcement_registration SET update_time = create_time WHERE update_time IS NULL;
|
||
|
|
|
||
|
|
-- 第 3 步：改为自动更新（加上 DEFAULT + ON UPDATE）
|
||
|
|
ALTER TABLE enforcement_registration
|
||
|
|
MODIFY COLUMN update_time DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;
|