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Updating rows in a table in MySQL

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schedule Jul 1, 2022
Last updated
local_offer MySQL
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tocTable of Contents
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We can update the information in a table in MySQL by using the UPDATE statement. To update multiple rows at once, we can make use of a INSERT INTO statement with a ON DUPLICATE KEY UPDATE construction.

Updating a single row

Given the below sample table about whether students hold a drivers license:

student_id

full_name

age

has_license

1

Sky Towner

17

0

2

Ben Davis

19

1

3

Travis Apple

18

0

4

Arthur David

16

0

5

Benjamin Town

17

1

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

To update the age of student Sky Towner to 18:

UPDATE drivers_license
SET age = 18
WHERE student_id = 1;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0

To check that age has been updated to 18 for Sky Towner:

SELECT *
FROM drivers_license;
+------------+---------------+------+-------------+
| student_id | full_name | age | has_license |
+------------+---------------+------+-------------+
| 1 | Sky Towner | 18 | 0 |
| 2 | Ben Davis | 19 | 1 |
| 3 | Travis Apple | 18 | 0 |
| 4 | Arthur David | 16 | 0 |
| 5 | Benjamin Town | 17 | 1 |
+------------+---------------+------+-------------+

Updating multiple rows

Given the below sample table about whether students hold a drivers license:

student_id

full_name

age

has_license

1

Sky Towner

17

0

2

Ben Davis

19

1

3

Travis Apple

18

0

4

Arthur David

16

0

5

Benjamin Town

17

1

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

To update the full_name of both student_id=1 and student_id=2:

INSERT INTO drivers_license (student_id, full_name)
VALUES (1, "Emma Parker"), (2, "Fiona Park")
ON DUPLICATE KEY UPDATE full_name = VALUES (full_name);
Query OK, 4 rows affected (0.00 sec)
Records: 2 Duplicates: 2 Warnings: 0

Essentially we are inserting new records into the table, however, if the student_id we are trying to insert already exists in the table then instead of inserting a new record we simply update the full_name of the existing record. In this case as student_id=1 and student_id=2 already existed in the table, the full_name of these records was updated.

SELECT * FROM drivers_license;
+------------+---------------+------+-------------+
| student_id | full_name | age | has_license |
+------------+---------------+------+-------------+
| 1 | Emma Parker | 17 | 0 |
| 2 | Fiona Park | 19 | 1 |
| 3 | Travis Apple | 18 | 0 |
| 4 | Arthur David | 16 | 0 |
| 5 | Benjamin Town | 17 | 1 |
+------------+---------------+------+-------------+

Although we only updated two records here, we can use similar syntax to update as many records as we like.

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Published by Arthur Yanagisawa
Edited by 0 others
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