摘要: INSERT INTO `cw_integral_student` (studentId) SELECT 9 9 用于占位from DUAL DUAL 是临时表的意思 WHERE NOT EXISTS ( select studentId from cw_integral_studentWHERE 阅读全文
posted @ 2020-06-28 10:43 锋_锋 阅读(929) 评论(0) 推荐(0) 编辑