![]() The main difference between them is that UNION removes duplicate records and UNION ALL keeps the duplicate records. The main use of UNION and UNION ALL is to join two tables. It matches every row of one table with every row of another table.Ħ. Difference between Full Join and Cross Join?Ī full join keeps all rows from both of the input tables even if we cannot find a matching row.Ĭross Join returns cartesian product of tables. Whereas WHERE clause runs prior to GROUP BY clause so it does not filter a grouping variable.ĥ. It runs after GROUP BY so it filters grouping variable. The HAVING clause comes into effect when GROUP BY is used. Difference between WHERE and HAVING clauses We can use WHERE clause to subset or filter data.Ĥ.
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