To know sum of a datwindow column

Posted on 2011-03-15
Last Modified: 2013-12-26
PB 10.5

datawindow control dw_1
dataobject dw_salary
sql = "select salary from salary"

I want to know the sum of column "salary"

I can do this by

1) create a compute column "compute_salary"
2) set the expression sum(salary for all) in "compute salary"
decimal ldc_sum_of_salary
ldc_sum_of_salary = dw_1.GetItemDecimal(1,"compute_salary")

My question is
Can I know the sum without creating computed column.

Question by:Mehram
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Expert Comment

ID: 35145988
Assuming you don't want' to change your SQL to 'SELECT SUM(salary)...' then you can use Describe() with an evaluate() expression and a row of zero e.g.

ldc_sum_of_salary = Dec(dw_1.Describe('evaluate("sum(  salary for all )",0)')


Author Comment

ID: 35146378
hi lbushby
You have got my point, but there is an error

This is working in my current running application
decimal ldc_credit
ldc_credit = tab_main.tabpage_2.dw_tab2.GetItemDecimal(1,"compute_Credit")

Replacing above technique with the technique in discussion

decimal ldc_credit2
ldc_credit2 = Dec(tab_main.tabpage_2.dw_tab2.Describe('evaluate("sum(  credit for all )",0)')
There is syntax error at compile

Accepted Solution

lbushby earned 500 total points
ID: 35146968
Sorry, missed a trailing bracket, try:

ldc_credit2 = Dec(tab_main.tabpage_2.dw_tab2.Describe('evaluate("sum(  credit for all )",0)'))
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Author Comment

ID: 35147574
Now the error is

"invalid argument to function"

Expert Comment

ID: 35147693
Are you sure that the dataobject contains a column called 'credit'?

In your original post you were using a column called 'salary' - it's important that you use the correct name.

If you're sure that the 'credit' column is there then does creating a computed field in the dataobject with an expression of 'sum(  credit for all )' work or does it give an error as well?

Author Comment

ID: 35153788
<<Are you sure that the dataobject contains a column called 'credit'?>>

Sorry, my fault.

the correct column name was amt in one dw and it was to be set in credit column of other (smry dw)

ant yes your code is working exactly I wanted.

// compute credit = sum(amt for all)
ldc_credit = tab_main.tabpage_2.dw_tab2.GetItemDecimal(1,"compute_Credit")
decimal ldc_credit2
ldc_credit2 = dec(tab_main.tabpage_2.dw_tab2.Describe('evaluate("sum(  amt for all )",0)'))
messagebox(string(ldc_credit), string(ldc_credit2))
both message is showing same amount. bingo



Author Closing Comment

ID: 35153794
A new technique is learned and now I can find max value of datawindow column easily which I need most of the time in my application.

Thanx a lot.

Best regards.

Expert Comment

ID: 35154705
Great, glad it worked - 'evaluate' can be a very useful function.

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