SQL查詢 - 我需要從查詢

Question

刪除重複如何選擇唯一行只有3個：這樣

63518 | 3 | 338 | 338 - Turks and .... | 0.0245 | 
63519 | 3 | 338 | 338 - Jamica   | 0.0235 | 
63522 | 3 | 338 | 338 - Haiti   | 0.0285 | 


SELECT 
    r.id, 
    r.client_id, 
    mcc.mcc AS mcc, 
    CONCAT(mcc.mcc, " - ", mcc.country_name) AS mcc_text, 
    r.rate, 
    mcc.dial_code, 
    r.active 
FROM rates r 
    INNER JOIN clients c 
    ON c.id = r.client_id 
    INNER JOIN mcc 
    ON mcc.mcc = r.mcc  
WHERE r.client_id = 3 AND r.mcc = 338 AND r.mnc = 50 AND r.active = 1 

我試圖用 .... GROUP BY r.id 但mcc_text是錯誤的

Answer 1

試試這個：

SELECT DISTINCT 
    r.id, 
    r.client_id, 
    mcc.mcc AS mcc, 
    CONCAT(mcc.mcc, " - ", mcc.country_name) AS mcc_text, 
    r.rate, 
    mcc.dial_code, 
    r.active 
FROM rates r 
    INNER JOIN clients c 
    ON c.id = r.client_id 
    INNER JOIN mcc 
    ON mcc.mcc = r.mcc  
WHERE r.client_id = 3 AND r.mcc = 338 AND r.mnc = 50 AND r.active = 1 

Answer 2

嘗試此查詢這可能工作

SELECT DISTINCT 
    r.id, 
    r.client_id, 
    mcc.mcc AS mcc, 
    CONCAT(mcc.mcc, " - ", mcc.country_name) AS mcc_text,  
    (SELECT rate FROM rates WHERE rates.id=r.id)AS rate, 
    mcc.dial_code, 
    r.active 
FROM rates r 
    INNER JOIN clients c 
    ON c.id = r.client_id 
    INNER JOIN mcc 
    ON mcc.mcc = r.mcc  
WHERE r.client_id = 3 AND r.mcc = 338 AND r.mnc = 50 AND r.active = 1 
GROUP BY r.id