unique element in sql
DISTINCT
- select distinct * from employees; ==> retrieves any row if it has at
least a single unique column.
- select distinct first_name from employees; ==> retrieves unique names
from table. (removes duplicates)
- select distinct count(*) from employees; retrieve number of unique rows
if any row has at least a single unique data.sql unique select
SELECT DISTINCT col1, col2, ....
FROM table_name;
SELECT col1, MIN(col2)
FROM table_name
GROUP BY col1;Copyright © 2021 Codeinu
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