1
我有這個數據庫:如何在內部連接上進行連接?
table
id fname dphone count_pic dup_id
6055903 Karla 5126xxx798 1 57
6173767 Aaliyah 4082xxx534 4 39
5611411 Aaliyah 4082xxx534 15 39
5611211 Aaliyah 4082xxx534 18 39
4234798 Abby 3057xxx974 31 16
6166691 Walter 6178xxx280 1 74
3375576 Walter 6178xxx280 17 74
,我發現怎麼做就可以了內部聯接是這樣的:
SELECT *
FROM table t1
INNER JOIN (SELECT MIN(count_pic) AS minpic,
MAX(count_pic) AS maxpic,
dup_id
FROM table
GROUP BY dup_id) t2 ON t1.dup_id = t2.dup_id
AND (t1.count_pic = minpic
OR t1.count_pic = maxpic)
,但如果我想加盟此表是什麼與另一個基於id
並返回一些值,如第二個表中的date,
以及:
table2
id date
6055903 111111111
6173767 111111111
5611411 111111111
對此的任何想法?
編輯:
內連接是好的事情是這樣的,我需要對查詢
剛添加第二個連接? 'SELECT * FROM table1 JOIN table2 ON(table1.id = table2.foreign_id)JOIN table3 ON(table1.id = table3.foreign_id)' – Thorsten