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Default column values in MySQL

Database
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MySQL
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Common questions
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Articles
schedule Jul 1, 2022
Last updated
local_offer MySQL
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By default, MySQL will not set default values for your column entries. Refer here for how to add a default value for a column in MySQL.

Example

To create a simple table with two columns name and age:

CREATE TABLE students (
name VARCHAR(30),
age INT
);

To then insert a record into the above table:

INSERT INTO students (name)
VALUES ('bob');

Note that we have not included any value for the age. Nonetheless, the code is perfectly valid. Now, let’s see how the table looks like:

SELECT * FROM students;
+------+------+
| name | age |
+------+------+
| bob | NULL |
+------+------+

Since we have not included the value for age, MySQL inserts a NULL value. For those who are familiar with programming languages like Java, you may have expected the age to be set to 0 since we have set the data type for the age column to be INT. However, this is clearly not the case for MySQL.

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Published by Arthur Yanagisawa
Edited by 0 others
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