如何通過場GROUP ORDER BY

Question

我有這樣的查詢：

SELECT 
    t.type, 
    SUM(t.external_account) 
FROM 
    u_contracts c, 
    u_data u, 
    u_transactions t 
WHERE 
    c.user_id = u.id 
    AND t.contract_id = c.id 
    AND t.nulled =0 
    AND DATE (c.init_date) < DATE (u.dead) 
    AND u.dead IS NOT NULL 
    AND t.type != 'repay' 
GROUP BY 
    t.type; 

現在，這給了我想要的結果，但現在我想添加ORDER BY給它，但如特定字段名：

ORDER BY FIELD(t.type, 'type1', 'type2', ...) 

但我無法將其插入到查詢中。當我嘗試這樣的：

SELECT 
    t.type, 
    SUM(t.external_account) 
FROM 
    u_contracts c, 
    u_data u, 
    u_transactions t 
WHERE 
    c.user_id = u.id 
    AND t.contract_id = c.id 
    AND t.nulled =0 
    AND DATE (c.init_date) < DATE (u.dead) 
    AND u.dead IS NOT NULL 
    AND t.type != 'repay' 
ORDER BY 
    FIELD(t.type, 'initial', 'commision', 'overpay', 'penalty', 'penalty2') 
GROUP BY 
    t.type; 

它給我的SQL錯誤：

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'GROUP BY t.type' at line 17 

什麼是這樣做的正確方法？

Answer 1

你剛纔打錯爲了group by和order by;

... 
ORDER BY 
    FIELD(t.type, 'initial', 'commision', 'overpay', 'penalty', 'penalty2') 
GROUP BY 
    t.type; 

應該是：

... 
GROUP BY 
    t.type 
ORDER BY 
    FIELD(t.type, 'initial', 'commision', 'overpay', 'penalty', 'penalty2');