SQL : Select distinct col1, col2, IF only one record will be the result other wise select col3

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SQL : Select distinct col1, col2, IF only one record will be the result other wise select col3
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SQL : Select distinct col1, col2, IF only one record will be the result other wise select col3
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distinct IF result : will select col2, Select the other only one wise SQL col3 be record col1,



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