は、結合操作

Question

後、私はこのSQLを持っている：

SELECT a.member_id, b.date, b.type, d.K_id, d.title, a.login 
    FROM members as a 
    JOIN permissions as b ON b.member_id = a.member_id 
    JOIN titles as d ON d.k_id = b.k_id 
    WHERE a.member_id = '$member' 
ORDER BY b.date DESC 

私はタイプが「3」と等しいログイン]を選択します。これは別の選択クエリなしで行うことができますか？

私は以下の回答に基づいて言い換えるべきです...私は、このクエリの結果からtype = 3の場所を選択したかったのです。

Answer 1

SELECT a.member_id, b.date, b.type, d.K_id, d.title, a.login 
FROM members as a 
JOIN permissions as b 
ON b.member_id = a.member_id 
JOIN titles as d 
ON d.k_id = b.k_id 
WHERE a.member_id = '$member' and b.type = '3' 
ORDER BY b.date DESC 

又は

WHERE a.member_id = '$member' and b.type = 3 

タイプの種類に応じ。

Answer 2

方法について：

SELECT a.member_id, b.date, b.type, d.K_id, d.title, a.login 
FROM members as a 
JOIN permissions as b 
ON b.member_id = a.member_id 
JOIN titles as d 
ON d.k_id = b.k_id 
WHERE a.member_id = '$member' AND b.type = '3' 
ORDER BY b.date DESC