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Select Distinct on Multiple columns into a dropdownlist

Select Distinct on Multiple columns into a dropdownlist

Select Distinct on Multiple columns into a dropdownlist


I have a table, SupportFiles that has columns ClientID, SupportYear and SupportMonth. Each ClientID has multiple records for each SupportYear and SupportMonth. I want to be able to select distinct on the SupportMonth and SupportYear, combining the 2 into a dropdownlist record! (I think that makes sense!)

For example, if I have the following records in SupportFiles,

ClientID SupportMonth SupportYear
1 6 2017
1 6 2017
1 7 2017
1 7 2017

My current selection criteria is,

Select Distinct SupportMonth ,SupportYear, 'Null' as SupportID from SupportFiles Where ClientID = 16 Order by SupportMonth, SupportYear

which returns,

SupportMonth SupportYear SupportID
6 2017 Null
7 2017 Null

I would like the rows returned to be as follows,

SupportYear SupportID
6/2017 Null
7/2017 Null

Is this acheivable?

Many thanks


RE: Select Distinct on Multiple columns into a dropdownlist

Replace my Variables with your fields, no need to declare etc. I just added these to demonstrate principle

DECLARE @number1 INT, @number2 INT

SET @number1 = 1

SET @number2 = 2017

SELECT RIGHT('00' + CAST(@number1 AS VARCHAR(2)), 2 )+'/'+ CAST(@number2 AS VARCHAR(4)) AS MthYear


RE: Select Distinct on Multiple columns into a dropdownlist

Perfect, thanks Ian

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