mysql查询的几个sql

查看存在zzj_temp1 不存在zzj_temp 中的品号数据

select t1.ProductID from zzj_temp1 t1 where  not exists (select * from zzj_temp t where t.ProductID=t1.ProductID)

查看多个字段关联并把查询出来的字段连接两次

select pq.ProductID,
group_concat(concat(l5.AreaCode,
                           l5.TypeCode,
                           l5.RowCode)) as locations 
          from twms_productlocationq pq, twms_location l5
          where pq.LocationID=l5.LocationSeq
          and pq.ProductID in(select productid from zzj_temp)
          group by pq.ProductID

查询结果不要有重复行

select p.ProductID ,p.ProductNameConcat   from twms_product p  where p.productin in(
select productid from zzj_temp
)GROUP BY p.ProductID