Question

我有一个包含EmployeeID和Weight的表。我需要获得列重量的MIN值和MAX值，然后将WeightLost计算为SUM（MIN - MAX）。

然后最后新列WeightLostLBS = WeightLost * 2.2

employeeid    weight    
1             100
1             120

结果将是

EmployeeID    WeightLost    Min     Max   WeightLostLBS
1                20         100     120        44

Answer 1

这里你不需要总和。正常减法将起作用。

select EmployeeID, MAX(Weight) - MIN(Weight) as WeightLost, MIN(Weight), MAX(Weight), (MAX(Weight) - MIN(Weight))*2.2 as WeightLostLBS
from table
group by EmployeeID

Answer 2

SELECT EmployeeID, 
       MAX(Weight) - MIN(Weight) AS WeightLost, 
       MIN(Weight) AS MIN, 
       MAX(Weight) AS MAX, 
       (MAX(Weight) - MIN(Weight))*2.2 AS WeightLostLBS
FROM table1
GROUP BY EmployeeID

<强>输出

EmployeeID  WeightLost  MIN   MAX   WeightLostLBS
1           20          100   120   44

<强>演示

http://sqlfiddle.com/#!9/61b2c4/1

SQL SUM（MIN（值） - MAX（值））

2 个答案: