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SQL Join

Last Modified: 2015-03-14

I have 2 tables.

TblA  Col1, Col2, Col3

TblB Col1, Col2, Col3

I need to join them BUT....

I need to return a row if ALL 3 Cols equal.

Col1= Col1
and Col2 = Col2
and Col3 = Col3


If ALL 3 Cols do NOT equal but

Col1 = Col1
and Col2 = Col2
and Col3 <> Col3

then return that row instead

So its sort of a double pass.  First pass is "do all 3 cols equal" if not "do Cols 1 & 2 equal", if not return nothing.

I am stumped, please help


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