Which is more efficient?
SELECT theField FROM theTable GROUP BY theField or
SELECT DISTINCT theField FROM theTable Which is more efficient? SELECT theField FROM theTable GROUP BY theField or SELECT DISTINCT
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Which is more efficient?
SELECT theField FROM theTable GROUP BY theField or
SELECT DISTINCT theField FROM theTable
In your example, both queries will generate the same execution plan so their performance will be the same.
However, they both have their own purpose. To make your code easier to understand, you should use distinct to eliminate duplicate rows and group by to apply aggregate operators (sum, count, max, …).