[英]How to sum items in a table if their FK appears more than once?
在这样的表格中:
FK-----Value
01-----100
02-----50
02-----150
03-----50
03-----50
如何查询显示为
FK-----Value
01-----100
02-----200
03-----100
SELECT FK, SUM(VALUE)
FROM YOUR_TABLE
GROUP BY FK
总和:
SELECT FK,SUM(Value)
FROM TABLE
GROUP BY FK;
对于马克斯:
SELECT FK,MAX(Value)
FROM TABLE
GROUP BY FK;
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