Display variants with sql query using smart search filter

I am trying to write a sql query in the smart search filter to show the available variants of that category page can you suggest how to write it,I tried this waySELECT 'SKUID',s.SKUID,c.CategoryDisplayName FROM COM_OptionCategory c INNER JOIN COM_SKUOptionCategory s ON c.CategoryID=s.CategoryID GROUP BY s.SKUID,c.CategoryDisplayName but it will not search all the products.