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SQL Distinct

Distinct is a keyword used with SELECT to return only unique values. Usually, you want to get all unique values, but there are duplicate values stored in the tables.

Check the difference: in our table, there are 18 records at all, and each record has a singer. You'll retrieve the 18 singers with the next query:

SELECT singer
FROM songs

              
12

            
SELECT singer
FROM songs
copy

But some singers, for example, AC/DC, occur multiple times. To retrieve the unique singers, use the DISTINCT keyword before the singer column:

SELECT DISTINCT singer
FROM songs

              
12

            
SELECT DISTINCT singer
FROM songs
copy

Now there are no repeated values, so you can see that the total number of unique singers is 10.

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Find all unique title values in songs.

Lösning

SELECT DISTINCT title FROM songs

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Avsnitt 1. Kapitel 4

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