MySQL查询字符串结合起来，结果

Question

我要携起手来这两个MySQL查询字符串的结果列像工人，产品，发布，接收pro_unitrs，pro_tot

首先==

select (select wor_code from chall_rec_master where rec_id = chall_rec_pro.rec_id) as Worker, pro_code, sum(pro_qty) as receive, pro_unitrs, pro_tot from chall_rec_pro group by pro_code 

秒= =

select (select worker_code from challan_master where challan_id = challan_mast_prod.challan_id) as Worker , pro_code, sum(pro_qty) as Issued from challan_mast_prod group by pro_code 

列工人，产品，分，接收pro_unitrs，pro_tot

Answer 1

一个联合查询应该做的技巧 - 非常简单，只要确保你有相同数量的列返回（做像pro_unitrs或''作为pro_unitrs你不会有其他查询的信息...' mysqltutorial.org/sql-union-mysql.aspx

select * from 
((
    select 
    (select wor_code from chall_rec_master where rec_id = chall_rec_pro.rec_id) as Worker, 
    pro_code, 
    sum(IFNULL(pro_qty,0)) as receive, 
    '' as Issued, 
    pro_unitrs, 
    pro_tot 
    from chall_rec_pro 
    group by pro_code 
) UNION (
    select (select worker_code from challan_master where challan_id = challan_mast_prod.challan_id) as Worker , 
    pro_code, 
    '' as receive, 
    sum(IFNULL(pro_qty,0)) as Issued, 
    '' as pro_unitrs, 
    '' as pro_tot 
    from challan_mast_prod 
    group by pro_code 
)) as results 

- 编辑 - 更新的查询，包括接收和发布 --edit2--更新的查询不总结空值 - MySQL的sum()将空输出如果它试图求和一个空值，所以把它放在ifnull()里面，如果变量设置为零，如果它为空。