SQL Server MAX() Problem

Question

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SQL

select max(LACode) as M from dbo.tblLeaveApproval where len(LACode)=8

The query results :

LAC-8038

But If I write the query like :

SQL

select max(LACode) as M from dbo.tblLeaveApproval

then it results :

LAC-999

Please give me a solution of this problem. Why such kind of difference is occurs?

Posted 30-Oct-13 23:07pm

Sumon562

Updated 30-Oct-13 23:24pm

coded007

v2

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2 solutions

Solution 2

SQL

select MAX(CAST(SUBSTR(LACode,5) as integer)) from dbo.tblLeaveApproval;

returns the maximum number after the 'LAC-' prefix.

Posted 31-Oct-13 0:38am

CPallini

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Mehdi Gholam · Accepted Answer · 2013-10-30T23:46:00

Solution 1

The data in the LACode column is being evaluated as a string hence LAC-9... is bigger than LAC-8... and when you filter on the length then you will not see the LAC-9xx values hence LAC-8xxx will be the bigger value.

Posted 30-Oct-13 23:46pm

Mehdi Gholam

Comments

CPallini 31-Oct-13 6:14am

5.

Mehdi Gholam 31-Oct-13 6:16am

Thanks!