[英]MYSQL query for selecting the result of a condition of one table and showing it on another table
從第一行減去第二行...並在第二個表中顯示結果
第一桌
--------------------------------
stock_name|temple|quantity|type
--------------------------------
rice |shiva | 32 |purchase
rice |shiva | 10 |issue
最初第二張表為空
我在第二張桌子中到底需要什么如下
---------------------------
stock_name|temple|quantity
--------------------------
rice |siva |22
INSERT INTO secondTable (stock_name,temple,quantity)
SELECT stock_name,
temple,
SUM(CASE WHEN type = 'purchase'
THEN quantity
ELSE quantity * -1
END) quantity
FROM firstTable
GROUP BY stock_name, temple
查詢的作用是將結果從第一個表插入到第二個表中,但已經具有計算出的數量。
Insert into Table2(stock_name,temple,quantity)
SELECT a.stock_name, a.temple, SUM(Case when Type='purchase' then quantity else (quantity*-1) End) AS quantity
FROM Table1 a
GROUP BY a.stock_name, a.temple
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