How to generate rownumber in SQL query in sequence like 1, 2, 4, 8, 16....n

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how to generate rownumber in sql query in sequence like 1,2,4,8,16....n

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how to generate rownumber in sql query in sequence like 1,2,4,8,16....n

Posted 8-Nov-21 18:17pm

Sachin Kulkarni B

Updated 8-Nov-21 20:01pm

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OriginalGriff · Accepted Answer · 2021-11-08T20:01:00

Solution 1

See here: SQL Server POWER() Function[^] But ... remember that SQL integers are 32 bit, so if you have more than 31 records it will fail with an arithmetic overflow error, and that you need to raise by the row number minus one.

Posted 8-Nov-21 20:01pm

OriginalGriff

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Sachin Kulkarni B 9-Nov-21 2:47am

Thankyou for the quick response

OriginalGriff 9-Nov-21 3:26am

You're welcome!

Richard Deeming 9-Nov-21 5:41am

NB: ROW_NUMBER[^] returns a bigint. POWER[^] works on floats, including bigint.

So long as you use POWER(CAST(2 As bigint), ..., you can get up to 63 rows before the overflow error. :)