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 how to determine the first column with null value
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Starting Member

47 Posts

Posted - 02/22/2013 :  15:54:01  Show Profile  Reply with Quote

I have a table with 7 columns like Cumulative_cnt, AX1, AX2, AX3, AX4, AX5, POS

i want to find the first AX column with a 'null' and assign that column number to POS as a value

for e.g. if AX3 has the first null value then POS is assigned a value 3.

table is as follows

AX1-AX5 are varchar
all columns after the first column with a Null is Null
all columns preceding the first column with Null has a value
at least one column has a value and is not null usually AX1

Yak Posting Veteran

98 Posts

Posted - 02/22/2013 :  16:05:24  Show Profile  Reply with Quote
You could use a computed column for POS.

(case when [AX1] IS NULL then (1) when [AX2] IS NULL then (2) when [AX3] IS NULL then (3) etc... end)
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