利用另一张表update更新字段_insert语句使用另一张表数据

前言

1、insert语句

1.1、Insert into

  语句形式为：Insert into Table2(field1,field2,...) select value1,value2,... from Table1
  
要求目标表Table2必须存在，由于目标表Table2已经存在，所以我们除了插入源表Table1的字段外，还可以插入常量。示例如下：
举例：Insert into Table2(a, c, d) select a,c,5 from Table1




INSERT INTO coupon_item_good_admin_user
( couponItemGoodId, couponAdzoneId, pubAdminId, pubAdminName, volume,
  cdate, udate, status)
  SELECT  c.id,c.couponAdzoneId,c.createAdminId,c.createAdminName,0, now(),now(),1
  from coupon_item_good c;

1.2、select into

SELECT vale1, value2 into Table2 from Table1

要求目标表Table2不存在，因为在插入时会自动创建表Table2，并将Table1中指定字段数据复制到Table2中。示例如下：
举例select a,c INTO Table2 from Table1

select ename,sal,job into pname,psal,pjob from emp where empno = eno;

2、update

UPDATE  coupon_item_good b set b.volume =
  (
  SELECT m.orderSize from
    ( SELECT  COUNT(c.itemId) as orderSize, c.itemId  as itemId from coupon_taoke_data c  WHERE  c.orderStatus not in ('订单失效') and c.status = 1 GROUP  by c.itemId  )  m WHERE   m.itemId = b.itemId )  
WHERE  b.itemId IN (40762167681);