Why Am I Getting the \'Field \'id\' Doesn\'t Have a Default Value\' Error in MySQL?

MySQL "Field 'id' Doesn't Have a Default Value" Error

When creating a table with a primary key that doesn't have a default value, MySQL will generate the error "Field 'id' doesn't have a default value." This indicates that the id field, which is usually intended as a unique identifier for each row in the table, is not being assigned a value.

To resolve this issue, there are two main approaches:

1. Auto Increment: By adding AUTO_INCREMENT to the id field's definition, MySQL will automatically assign unique sequential values starting from 1. This is the preferred method when you want the id field to be a continuous, non-repeating number.

ALTER TABLE card_games
ALTER COLUMN id INT(11) NOT NULL AUTO_INCREMENT;

2. Explicit Insertion: If you prefer to manually define the id values, ensure that they are unique for each row. This can be done by explicitly specifying the id value 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 ensure that the id field has appropriate values, resolving the "Field 'id' doesn't have a default value" error and allowing you to create a valid database table.

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