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Editorial Team
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Asked: 2026-05-13T23:58:39+00:00

I have a sql table of payroll data that has wage rates and effective

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I have a sql table of payroll data that has wage rates and effective dates associated with those wage rates, as well as hours worked on various dates. It looks somewhat like this:

EMPID  DateWorked  Hours  WageRate  EffectiveDate

1      1/1/2010     10     7.00      6/1/2009
1      1/1/2010     10     7.25      6/10/2009
1      1/1/2010     10     8.00      2/1/2010
1      1/10/2010 ...
2      1/1/2010  ...

…

And so on. Basically, the data has been combined in such a way that for every day worked, all of the employee’s wage history is joined together, and I want to grab the wage rate associated with the LATEST effective date that is not later than the date worked. So in the example above, the rate of 7.25 that become effective on 6/10/2009 is what I want.

What kind of query can I put together for this? I can use MAX(EffectiveDate) alongwith a criteria based on being before the work date, but that only gives me the latest date itself, I want the associated wage. I am using Sql Server for this.

Alternatively, I have the original tables that were used to create this data. One of them contains the dates worked, and the hours as well as EMPID, the other contains the list of wage rates and effective dates. Is there a way to join these instead that would correctly apply the right wage rate for each work day?

I was thinking that I’d want to group by EMPID and then DateWorked, and do something from there. I want to get a result that gives me the wage rate that actually is the latest effective rate for each date worked

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1 Answer

  1. Editorial Team
    select p.*
from (
    select EMPID, DateWorked, Max(EffectiveDate) as MaxEffectiveDate
    from Payroll
    where EffectiveDate <= DateWorked
    group by EMPID, DateWorked
) pm
inner join Payroll p on pm.EMPID = p.EMPID and pm.DateWorked = p.DateWorked and pm.MaxEffectiveDate = p.EffectiveDate

    Output:

    EMPID       DateWorked              Hours       WageRate                                EffectiveDate
----------- ----------------------- ----------- --------------------------------------- -----------------------
1           2010-01-01 00:00:00.000 10          7.25                                    2009-06-10 00:00:00.000
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