$sql = 'DELETE O, G FROM ' . $GLOBALS['ecs']->table('delivery_order') . ' AS O, ' . $GLOBALS['ecs']->table('delivery_goods') . ' AS G WHERE O.order_id = \'' . $order_id . '\' AND O.status = AND O.delivery_id = G.delivery_id'; $query = $GLOBALS['db']…
一.去重 1.查询出重复的记录 CREATE TABLE push_log_full_2013_10_30_tmp SELECT * FROM `push_log_full` WHERE time BETWEEN FROM_DAYS(TO_DAYS(NOW()) - 1) AND FROM_DAYS(TO_DAYS(NOW())) AND (imsi, andriodid, time) IN ( SELECT imsi, andriodid, time FROM `push_log_full`…
如果您是才接触MySQL数据库的新人,那么MySQL中多表删除是您一定需要掌握的,下面就将为详细介绍MySQL中多表删除的方法,供您参考,希望对你学习掌握MySQL中多表删除能有所帮助. 1.从MySQL数据表t1中把那些id值在数据表t2里有匹配的记录全删除掉 DELETE t1 FROM t1,t2 WHERE t1.id=t2.id 或DELETE FROM t1 USING t1,t2 WHERE t1.id=t2.id 2.从MySQL数据表t1里在数据表t2里没有匹配的记录查找出来并…
delete 多表删除的使用 1.从数据表t1中把那些id值在数据表t2里有匹配的记录全删除掉 DELETE t1 FROM t1,t2 WHERE t1.id=t2.id 或 DELETE FROM t1 USING t1,t2 WHERE t1.id=t2.id 2.从数据表t1里在数据表t2里没有匹配的记录查找出来并删除掉 DELETE t1 FROM t1 LEFT JOIN T2 ON t1.id=t2.id WHERE t2.id IS NULL 或 DELETE FRO…
本实验所用代码来源于官网文档 from sqlalchemy import Table, Column, Integer, String, ForeignKey from sqlalchemy.orm import relationship, backref from sqlalchemy.ext.declarative import declarative_base Base = declarative_base() '''关联表删除实验''' class User(Base): __tabl…
