how to find unique element in sql

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Theo
14 Jun 2017
1DISTINCT
2- select distinct * from employees; ==> 
3           retrieves any row if it has at 
4           least a single unique column.
5- select distinct first_name from employees; ==> 
6              retrieves unique names
7              from table. (removes duplicates)
8- select distinct count(*) from employees;
9          retrieve number of unique rows
10          if any row has at least a single unique data.
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