Sql Result Set Filter Duplicates. The primary key ensures that the table has no duplicate rows. Eliminating Duplicate Rows from MySQL Result Sets.
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If you want distinct companyname then use this. This empty result set is combined with the first part of the UNION part. WITH cte AS SELECT col ROW_NUMBER OVER PARTITION BY col ORDER BY col row_num FROM t1 SELECT FROM cte WHERE row_num 1.
To retain the duplicate rows in the result set you use the UNION ALL operator.
The primary key ensures that the table has no duplicate rows. First let us see how the following SELECT query returns duplicate salary records. To retain the duplicate rows in the result set you use the UNION ALL operator. You can use the DISTINCT or DISTINCTROW identifier to eliminate duplicate records.
