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.

Similar codes

7 votes162 views6 answers
Mysql group concat
SQL
0 vote177 views1 answer
Flask sqlalchemy session delete
SQL
0 vote116 views1 answer
Connection error in mysql workbench
SQL
0 vote157 views1 answer
Laravel migration sql dump
SQL
15 votes153 views2 answers
Select Options
SQL
0 vote155 views1 answer
If column value is null then in mysql
SQL
0 vote149 views1 answer
Start and stop mysql
SQL
1 vote140 views1 answer
Sql Split string function
SQL
19 votes149 views5 answers
Change column name mysql command line
SQL
0 vote140 views1 answer
How to to get current date and time in sql
SQL