How is MIN Function is used in SQL?

Programming Language
#1

SQL MIN function is used to find out the record with minimum value among a record set.

To understand MIN function, consider an employee_tbl table, which is having the following records −

SQL> SELECT * FROM employee_tbl;
+------+------+------------+--------------------+
| id   | name | work_date  | daily_typing_pages |
+------+------+------------+--------------------+
|    1 | John | 2007-01-24 |                250 |
|    2 | Ram  | 2007-05-27 |                220 |
|    3 | Jack | 2007-05-06 |                170 |
|    3 | Jack | 2007-04-06 |                100 |
|    4 | Jill | 2007-04-06 |                220 |
|    5 | Zara | 2007-06-06 |                300 |
|    5 | Zara | 2007-02-06 |                350 |
+------+------+------------+--------------------+
7 rows in set (0.00 sec)

Now suppose based on the above table you want to fetch minimum value of daily_typing_pages, then you can do so simply using the following command −

SQL> SELECT MIN(daily_typing_pages)
   -> FROM employee_tbl;
+-------------------------+
| MIN(daily_typing_pages) |
+-------------------------+
|                     100 |
+-------------------------+
1 row in set (0.00 sec)

You can find all the records with minimum value for each name using GROUP BY clause as follows −

SQL> SELECT id, name, work_date, MIN(daily_typing_pages)
    -> FROM employee_tbl GROUP BY name;
+------+------+-------------------------+
| id   | name | MIN(daily_typing_pages) |
+------+------+-------------------------+
|    3 | Jack |                     100 |
|    4 | Jill |                     220 |
|    1 | John |                     250 |
|    2 | Ram  |                     220 |
|    5 | Zara |                     300 |
+------+------+-------------------------+
5 rows in set (0.00 sec)