Question

我在mysql表中有以下数据名为wallet_txns。

wlt_name   wlt_txn_type   wlt_txn_amount
A           Income              200
A           Expense             100 
B           Income              100
B           Income              500
B           Expense             200

我试图得到如下数据的输出（单行收入和费用之和）

Wlt_name    Expense       Income
A           100            200
B           200            600

我使用了以下查询，但我没有按预期得到输出，（获得单独行的收入和费用）请帮助......

select
    wlt_name,
    if(wlt_txn_type = 'Expense', wlt_txn_amount, 0) as Expense,
    if(wlt_txn_type = 'Income', wlt_txn_amount, 0) as Income
from wallet_txns
;

Answer 1

也许您可以帮助这部分代码：SUM(IF(wlt_txn_type = "Income", wlt_txn_amount, 0)) AS IncomeTotal。

Answer 2

您可以使用conditional sum，然后使用group by

select 
wlt_name, 
sum(
 case when wlt_rxn_type ='Income' then wlt_txn_amount else 0 end
) as `Income`,
sum(
 case when wlt_rxn_type ='Expense' then wlt_txn_amount else 0 end
) as `Expense` 
from wallet_txns group by wlt_name;

Answer 3

你可以这样做：

SELECT
    Wlt_name,
    SUM(CASE WHEN wlt_txn_type='Expense' THEN wlt_txn_amount ELSE 0 END) AS Expense,
    SUM(CASE WHEN wlt_txn_type='Income' THEN wlt_txn_amount ELSE 0 END) AS Income
FROM
    wallet_txns
GROUP BY
    Wlt_name

Answer 4

您几乎已经编写了正确的查询，但忘了sum和group。在这里查询：

select
    wlt_name,
    sum(if(wlt_txn_type = 'Expense', wlt_txn_amount, 0)) as Expense,
    sum(if(wlt_txn_type = 'Income', wlt_txn_amount, 0)) as Income
from wallet_txns
group by wlt_name
;

Answer 5

我不是mysql用户，但TSQL对我来说没什么秘诀。检查WWW上的PIVOT - UNPIVOT替代品。

mysql表数据根据数据类型在单行中输出

5 个答案: