Question

我需要从表1中找到group id = 1的项目（结果1）然后那些组ID为1的项目，转到表2过滤结果1 +只选择那些价格id = 200 表1，项目ID，组ID 表2，项目ID，价格ID

我尝试过选择内连接但无法过滤。 union all返回错误，因为列数据不相同。

select item id, group id 
from table 1 
where groupid = '1'
inner join 
   select item id, price id 
   from table 2 
   where price id = '200'

Answer 1

尝试

select * from table2 as t2 inner join (select * from table1 where groupid=1) as t1
on t1.itm_id =t2.itm_id where t2.price_id=200

Answer 2

你有什么尝试？是这样的吗？

SELECT t1.a, 
       t1.b, 
       t1.c, 
       t2.x, 
       t2.y 
FROM   t1 
       inner join t2 
               ON t1.KEY = t2.KEY 
WHERE  t1.grpid = 1 
       AND t2.priceid = 200;

从表1中选择sql，然后使用表1列条件过滤表2列

2 个答案: