0
我正在摸索着我的腦子在MySQL子查詢上。它只是在抓了幾個小時之後才把它放在這裏。所以在這裏,它是:mysql子查詢問題
$query_1 = "SELECT *
FROM table_new
WHERE table_new.NAME NOT IN ('text I know does not exist') ";
$query_2 = "SELECT *
FROM table_new,
table_old
WHERE table_new.NAME = table_old.NAME ";
$query_3 = "SELECT *
FROM table_new
WHERE table_new.NAME NOT IN (SELECT *
FROM table_new,
table_old
WHERE table_new.NAME = table_old.NAME) ";
這裏的問題:
$ QUERY_1和$ query_2工作。但是,當我將它們組合在$ query_3中時,它不起作用。
有什麼想法?
你的第一個建議就像一個魅力。謝謝! – 2011-03-02 02:19:48