Inner join with "Last"

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Hi, I have a list of account numbers with two/three corresponding codes. However I only need the most recent code and ignore the previous codes, if I were to use a normal join query it will include all the corresponding codes, how do I do the query so it only takes only the most recent code? Thanks for any advice anyone might be able to offer on this.

I tried using a last() but it doesnt work.

SQL

SELECT DISTINCT taa.AS400, taa.Company, taa.Account_Area, taa.Customer_Account, LAST(OMDIM1) as test

FROM dbo.testAccountArea taa

LEFT JOIN dbo.vtbl_orbt_fmosal_vantage sal

ON

taa.AS400 = sal.OMAS400 AND taa.Company = sal.OMCOMP AND taa.Customer_Account = sal.OMCUST

Posted 24-Jan-11 21:13pm

Yu Ong

Updated 24-Jan-11 21:32pm

CPallini

v2

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E.F. Nijboer · Answer 1 · 2011-01-24T23:38:00

Solution 1

First of all, the statement select distinct ..., last(...) is somewhat strange because there can only be one last record so distinct has no use. I also don't know where OMDIM1 is coming from, but I would try something like this:

select distinct t1.a, t1.b, t1.c from t1 where t1.a = (select last(t2.a) from t2)

It's not the most beautiful sql syntax but for the sake of this example will hopefully do.

Good luck!

Posted 24-Jan-11 23:38pm

E.F. Nijboer

Comments

Yu Ong 25-Jan-11 7:46am

Hi Thanks for the reply

However, I got an error 'last' is not a recognized built-in function name. Do you know why this could be an issue? Thanks!

E.F. Nijboer 25-Jan-11 8:10am

Yes, I assumed that you mentioned Last() and that it would be a valid function. It seems it isn't supported in all dialects. Luckily they give an alternative at w3cschool:
http://www.w3schools.com/sql/sql_func_last.asp
Otherwise this could maybe also work: select max(t2.a) from t2 group by t2.a