Update Multiple rows using some formula on a row.

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I have a table and need to update the column of that table using some formula. The sample table and data are as below:-

Ecode	CountyGroupName	Project	Duration
101	NJ	Project1	15
101	CJ	Project1	12
101	PK	Project3	10
102	NJ	Project1	20
102	PK	Project2	10

I want to do an update on all duration column.The update will be like this:-
Total duration for ECode 101 is 15+12+10=37 and for Ecode 102 is 20+10=30.The Update will give this as the output:-

Ecode	CountyGroupName	Project	Duration
101	NJ	Project1	(15*12)/37
101	CJ	Project1	(12*12)/37
101	PK	Project3	(10*12)/37
102	NJ	Project1	(20*12)/30
102	PK	Project2	(10*12)/30

As in all the duration some calculation is going and the formula will be :-
(Actual Duration*12)/(Sum Of duration for that ECode)

Please provide me the Query in sql.

Posted 6-Feb-12 20:02pm

Dharmenrda Kumar Singh

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Dharmenrda Kumar Singh · Accepted Answer · 2012-02-06T21:03:00

Solution 1

SQL

UPDATE t1
   SET
      t1.Duration = (t1.Duration*12)/(select SUM(duration) from EmpTable where ECode=t1.ECode)
   FROM
      EmpTable t1,
      EmpTable t2

Posted 6-Feb-12 21:03pm

Dharmenrda Kumar Singh