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MySQL | SELECT

Database
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MySQL
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Documentation
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Statements and Clauses
schedule Jul 1, 2022
Last updated
local_offer MySQL
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MySQL's SELECT statement allows us to retrieve records from a database.

Syntax

SELECT column_name(s)
FROM table_name;

Examples

Consider the following table about some students:

student_id

fname

lname

day_enrolled

age

username

1

Sky

Towner

2015-12-03

17

stowner1

2

Ben

Davis

2016-04-20

19

bdavis2

3

Travis

Apple

2018-08-14

18

tapple3

4

Arthur

David

2016-04-01

16

adavid4

5

Benjamin

Town

2014-01-01

17

btown5

The above sample table can be created using the code here.

All columns

To return all columns from the table students:

SELECT * FROM students;
+------------+----------+--------+--------------+------+----------+
| student_id | fname | lname | day_enrolled | age | username |
+------------+----------+--------+--------------+------+----------+
| 1 | Sky | Towner | 2015-12-03 | 17 | stowner1 |
| 2 | Ben | Davis | 2016-04-20 | 19 | bdavis2 |
| 3 | Travis | Apple | 2018-08-14 | 18 | tapple3 |
| 4 | Arthur | David | 2016-04-01 | 16 | adavid4 |
| 5 | Benjamin | Town | 2014-01-01 | 17 | btown5 |
+------------+----------+--------+--------------+------+----------+

Selecting to retrieve all columns is essentially equivalent to fetching the entire table.

Specific columns

To only retrieve fname and lname columns (in that order) from the table students:

SELECT fname, lname FROM students;
+----------+--------+
| fname | lname |
+----------+--------+
| Sky | Towner |
| Ben | Davis |
| Travis | Apple |
| Arthur | David |
| Benjamin | Town |
+----------+--------+

WHERE clause

SELECT may be used with a WHERE clause to specify conditions a row must satisfy to be retrieved.

To only retrieve students who are older than 17:

SELECT * FROM students
WHERE age > 17;
+------------+--------+-------+--------------+------+----------+
| student_id | fname | lname | day_enrolled | age | username |
+------------+--------+-------+--------------+------+----------+
| 2 | Ben | Davis | 2016-04-20 | 19 | bdavis2 |
| 3 | Travis | Apple | 2018-08-14 | 18 | tapple3 |
+------------+--------+-------+--------------+------+----------+

'Ben' and 'Travis' are the only students who are older than 17 in the table students.

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Published by Arthur Yanagisawa
Edited by 0 others
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