How to Fix the \'Field \'id\' Doesn\'t Have a Default Value\' Error in SQL?

Addressing the "Field 'id' Doesn't Have a Default Value" Error

When creating a SQL table with a primary key field that lacks a default value, you may encounter the error message "Field 'id' doesn't have a default value." To resolve this issue, we need to ensure that the primary key field has a defined strategy for generating unique values.

Auto-Incrementing Primary Keys

One common solution is to make the primary key field auto-incremented. This means that the database will automatically generate unique values for each new row inserted into the table. To achieve this, we can modify the table definition as follows:

id INT NOT NULL AUTO_INCREMENT

We also need to set the primary key constraint explicitly:

PRIMARY KEY (id)

This ensures that every new row will have a unique id value, eliminating the error.

Manually Specifying Primary Key Values

Alternatively, if you want more control over the primary key values, you can manually specify them for each row inserted into the table. To do this, simply assign a unique value to the id field in the INSERT statement.

INSERT INTO card_games (id, nafnleiks, leiklysing, prentadi, notkunarheimildir, upplysingar, ymislegt)
VALUES (1, 'Svartipétur', 'Leiklýsingu vantar', 'Er prentað í: Þórarinn Guðmundsson (2010). Spilabókin - Allir helstu spilaleikir og spil.', 'Heimildir um notkun: Árni Sigurðsson (1951). Hátíðir og skemmtanir fyrir hundrað árum', 'Aðrar upplýsingar', 'ekkert hér sem stendur' );

By following one of these approaches, you can resolve the "Field 'id' doesn't have a default value" error and ensure that your table has a properly defined primary key that guarantees unique row identification.

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