來自兩個不同表格的兩個字段的Mysql總和

我想根據labour_master_id來自不同表格的兩個字段的總和。但是當我得到結果時，它顯示出不同的結果。來自兩個不同表格的兩個字段的Mysql總和

這裏是我試過

select labours.labour_master_id, 
    sum(labours.amount_paid), 
    sum(labour_cashcredits.amount_paid) 
FROM labours 
left join labour_cashcredits 
    on labours.labour_master_id=labour_cashcredits.labour_master_id 
group by labours.labour_master_id

它可以被映射兩次，它顯示錯誤的結果。

現在問題正在發生總和。

任何想法如何做到這一點？

我有這個query..please幫助錯誤

select l.labour_master_id, l.amount_paid as payable, cc.amount_paid as paid 
       FROM 
       (
        select labour_master_id, sum(amount_paid) amount_paid 
        from labours 
        group by labour_master_id 
       ) l 
       left join 
       (
        select labour_master_id, sum(amount_paid) amount_paid 
        from labour_cashcredits 
        group by labour_master_id 
       ) cc 
           left join 
       (
        select name,id 
        from labour_masters 
       ) lm 
        on l.labour_master_id=cc.labour_master_id 
on l.labour_master_id=lm.labour_masters.id

來源

2012-12-19 Amandeep Kaur

？你可以給數據樣本嗎？ –

，因爲在第二個表可能數據退出或沒有 –

總和，如果數據退出第二個表 –

您可以嘗試使用子查詢來執行每個表中的總和：

select l.labour_master_id, 
    l.amount_paid, 
    cc.amount_paid 
FROM 
(
    select labour_master_id, sum(amount_paid) amount_paid 
    from labours 
    group by labour_master_id 
) l 
left join 
(
    select labour_master_id, sum(amount_paid) amount_paid 
    from labour_cashcredits 
    group by labour_master_id 
) cc 
    on l.labour_master_id=cc.labour_master_id

來源

2012-12-19 11:42:34 Taryn

感謝它對我有用..是否有任何方法來做沒有子查詢？ –

@AmandeepKaur你可能會改變這種情況，只在第二張表上使用子查詢，但IMO有時候更容易使用子查詢。 – Taryn

好的非常感謝:) –

使用this--

 SELECT labours.labour_master_id, SUM (labours.amount_paid), 
    SUM (labour_cashcredits.amount_paid) 
    FROM labours,labour_cashcredits 
    where labours.labour_master_id = labour_cashcredits.labour_master_id 
GROUP BY labours.labour_master_id

來源

2012-12-19 11:39:29

希望這是你想要的，

select labours.labour_master_id, 
    sum(ifnull(labours.amount_paid,0))+ 
    sum(ifnull(labour_cashcredits.amount_paid),0) sum 
FROM labours 
left join labour_cashcredits 
    on labours.labour_master_id=labour_cashcredits.labour_master_id 
group by labours.labour_master_id

來源

2012-12-19 11:42:50 Mari

嘗試使用子查詢第二SUM：你爲什麼要使用左連接這裏

SELECT labours.labour_master_id, SUM(labours.amount_paid), 
      (SELECT SUM(amount_paid) FROM labour_cashcredits 
      WHERE labour_master_id = labours.labour_master_id 
      GROUP BY labour_master_id 
      ) AS credit_amount_paid 
FROM labours 
LEFT JOIN labour_cashcredits ON labours.labour_master_id = labour_cashcredits.labour_master_id 
GROUP BY labours.labour_master_id

來源

2012-12-19 11:43:13 Sithu

來自兩個不同表格的兩個字段的Mysql總和

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