SQL構文の問題

Question

私は2つのテーブルを結合して単純なカウントをしていますが、結合されたキー変数の名前を2つのテーブルに適したものに変更することはできません。 "CUSTOMER_NO"それが使用されているコンテキストで有効です。私はそれがほんの少し構文エラーだと確信していますが、私はそれを見ることができない...

SELECT owner_no AS customer_no, 

CASE 
WHEN customer_no BETWEEN 5000 and 5999 THEN 'RENTER' 
WHEN customer_no BETWEEN 6000 and 6999 THEN 'OWNER' 
END AS customer_type 

FROM owner_phone AS op 
INNER JOIN renter_phone AS rp ON op.owner_no = rp.renter_no 

GROUP BY customer_no 
HAVING COUNT(*) > 1; 

Answer 1

エイリアス化された列名ではなく、CASEおよびGROUP BYで実際の列名を使用します。

CASE 
WHEN owner_no BETWEEN 5000 and 5999 THEN 'RENTER' 
WHEN owner_no BETWEEN 6000 and 6999 THEN 'OWNER' 
END AS customer_type 

FROM owner_phone AS op 
INNER JOIN renter_phone AS rp ON op.owner_no = rp.renter_no 
GROUP BY owner_no 
HAVING Count(*) > 1; 

Answer 2

あなたは、クエリの残りをOWNER_NOを使用する必要がありますが、列名ことを確認するためにAS CUSTOMER_NOを残します。

SELECT owner_no AS customer_no, 
CASE 
    WHEN owner_no BETWEEN 5000 and 5999 THEN 'RENTER' 
    WHEN owner_no BETWEEN 6000 and 6999 THEN 'OWNER' 
END AS customer_type 
FROM owner_phone AS op 
INNER JOIN renter_phone AS rp ON op.owner_no = rp.renter_no 
GROUP BY owner_no 
HAVING COUNT(*) > 1;