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optional variables

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Last Modified: 2012-08-13
I am trying to build a procedsure that can take either one of two variables and run two different sql statesments. roughly liek this

declare var1,var2

if var1 > '' then

select * from table1

or if var2 is > '' then
select * from table2

i also want to do nothing if both var1 and var 2 are empty

thank you
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