Question

我想在mysql查询中的某些条件下进行SUM或SUBTRACTION。这是：SQLFiddle

条件：

如果ce_type为IN或NULL，则在变量中添加payment_amount

和

如果ce_type为OUT，那么我想从该变量中减去payment_amount。

我尝试了这个查询。但是，我不知道如何把条件放在这里。

SELECT SUM(payment_amount) as payment_amount
FROM customer_payment_options
WHERE (real_account_id='11' AND real_account_type='HQ')
AND company_id='1'

Answer 1

如果我理解正确，您只需要条件聚合：

SELECT SUM(CASE WHEN ce_type = 'IN' or ce_type is NULL then payment_amount
                WHEN ce_type = 'OUT' then - payment_amount
           END) as payment_amount
FROM customer_payment_options
WHERE real_account_id = '11' AND real_account_type = 'HQ' AND company_id = '1';

Answer 2

如果 ce_type 只能包含值 NULL ， IN 和 OUT ，则以下语句可执行此作业

SELECT SUM(IF(ce_type = 'IN' OR ce_type is NULL,payment_amount,-payment_amount)) as payment_amount
FROM customer_payment_options
WHERE (real_account_id='11' AND real_account_type='HQ')
AND company_id='1';

Answer 3

SELECT SUM(
    CASE WHEN ce_type IS NULL THEN 1 ELSE 
        CASE ce_type WHEN 'IN' THEN 1 ELSE -1 END 
    END 
    * payment_amount) as payment_amount
FROM customer_payment_options
WHERE (real_account_id='11' AND real_account_type='HQ')
AND company_id='1'

Answer 4

您可以使用IF()有条件地进行更改：

SELECT SUM(IF(ce_type = "OUT", -1 * payment_amount, payment_amount)) as payment_amount
FROM customer_payment_options
WHERE (real_account_id='11' AND real_account_type='HQ')
AND company_id='1'

在mysql查询中条件为SUM或SUBTRACTION

4 个答案: