![](/img/trans.png)
[英]how to store big text data in two tables with an id link using mysql and php
[英]How to store/process multiple tables's data using MySql and PHP
我有5個不同的MySql表,即:
u_t(uid,pwd,field1,field2)
t_1(tid_1,ut_uid,field_1,field_2,points)
t_2(tid_2,ut_uid,field_1,field_2,points)
t_3(tid_3,ut_uid,field_1,field_2,points)
t_4(tid_4,ut_uid,field_1,field_2,points)
PS:uid = pk,tid_1,2,3,4 = pk,ut_uid = fk
以上所有表格都基於一些獨特的功能提供了一些信息。
現在我希望使用PHP從每個表中獲取每個用戶存儲和顯示目的的點數總和。
嘗試
select u_t.uid,
sum(t_1.points+t_2.points+t_3.points+t_4.points+t_5.points) as total_p
from u_t
left outer join t_1 on t_1.ut_uid = u_t.uid
left outer join t_2 on t_2.ut_uid = u_t.uid
left outer join t_3 on t_3.ut_uid = u_t.uid
left outer join t_4 on t_4.ut_uid = u_t.uid
group by u_t.uid
這個丑陋的版本:
SELECT ut.uid, sum(t1.pts + t2.pts + t3.pts + t4.pts) total
FROM u_t ut
LEFT JOIN
(
SELECT ut_uid, sum(points) pts
FROM t_1
GROUP BY ut_uid
) t1
on ut.uid = t1.ut_uid
LEFT JOIN
(
SELECT ut_uid, sum(points) pts
FROM t_2
GROUP BY ut_uid
) t2
on ut.uid = t2.ut_uid
LEFT JOIN
(
SELECT ut_uid, sum(points) pts
FROM t_3
GROUP BY ut_uid
) t3
on ut.uid = t3.ut_uid
LEFT JOIN
(
SELECT ut_uid, sum(points) pts
FROM t_4
GROUP BY ut_uid
) t4
on ut.uid = t4.ut_uid
GROUP BY ut.uid
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.