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mysql
如题,怎样先判断外键是否存在,然后在删除,像
if EXISTS((SELECT COUNT(*) FROM information_schema
.KEY_COLUMN_USAGE
where constraint_name='fk_emp_dept_id') > 0)
alter table org_employee
drop foreign key fk_emp_dept_id
;
还有,
if EXISTS((SELECT COUNT(*) FROM information_schema
.KEY_COLUMN_USAGE
where constraint_name='fk_emp_dept_id') > 0)
BEGIN
alter table org_employee
drop foreign key fk_emp_dept_id
;
END
都会报错,求大神解答
回复内容:
https://zhidao.baidu.com/question/692089969116125764.html