Why is LAST_VALUE() not working in SQL Server? -

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here's data have (note 1 entity id / employee id, there multiple. 1 entity id can have multiple employee ids under it):

select  entityid,         employeeid,         payperiodstart,         isfulltime    dbo.payroll   employeeid = 316691         , payperiodstart <= '12/31/2014'         , payperiodend >= '1/1/2014';

i want grab last "isfulltime" value each entityid & employeeid combo.

i tried doing this:

select  entityid,         employeeid,         last_value(isfulltime) on (partition entityid, employeeid order entityid, employeeid, payperiodstart) lastisfulltimevalue    dbo.payroll   employeeid = 316691         , payperiodstart <= '12/31/2014'         , payperiodend >= '1/1/2014';

but i'm getting this:

the query should return 1 row each entityid / employeeid.

what doing wrong?

i believe looking use row_number() , last value based on payperiodstart date:

select t.entityid     ,t.employeeid     ,t.lastisfulltimevalue (     select entityid         ,employeeid         ,row_number() on (             partition entityid             ,employeeid order payperiodstart desc             ) rn         ,lastisfulltimevalue     dbo.payroll     employeeid = 316691   -- put in outer query instead         , payperiodstart <= '12/31/2014'         , payperiodend >= '1/1/2014'     ) t t.rn = 1;

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