我想從不同的表中不同列的總和,我已經做了這樣的事情下面,我想有更好的辦法,這在MySQL一個更好的辦法來提高MySQL的這個查詢
select
(select sum(sal) from budget_tp) as sal_tp,
(select sum(sal) from budget_fos_veri) as sal_veri,
(select sum(sal) from budget_fos_picks)as sal_pick,
(select sum(sal) from budget_bpo_other)as sal_bpo;
不,這很好... – zerkms 2012-08-03 06:45:00
它運行緩慢嗎?是什麼讓你覺得它可以改進? – nico 2012-08-03 06:45:47
每個表格中是否有相關的列? – 2012-08-03 06:45:54