我有03桌有關係選擇並計算表關係?
jos_session
+userid
jos_gj_user
+id_user
+id_group
jos_gj_jb
+group_id
+category_id
我是要計算用戶在表jos_session基礎上CATEGORY_ID表jos_gj_jb
這是我想
SELECT COUNT(s.userid)
FROM jos_session s
WHERE s.user.id IN (SELECT id_user
FROM jos_gj_user
WHERE id_group(SELECT group_id FROM jos_gj_jb WHERE category_id= .$variable.))
怎麼算user_id爲category_id?
你的問題是什麼? – hobodave 2010-01-15 09:16:10