select unique row code example

Example 1: 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.

Example 2: sql find all different values in column

SELECT DISTINCT
    column_name
FROM
    table_name;

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