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

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

When creating a database table, it's crucial to address the absence of a default value for primary key fields. This error can arise as you are creating a table named card_games.

The error message "Field 'id' doesn't have a default value" indicates that the id column, which serves as the primary key for identifying unique rows in the table, lacks a predetermined value.

To rectify this, modify your table definition to ensure that the id column is auto-incremented. This enables the database to automatically assign unique values to each new row, obviating the need to explicitly specify the id value during data insertion.

Here's the updated table definition:

CREATE TABLE card_games (
   id int(11) NOT NULL AUTO_INCREMENT,
   nafnleiks varchar(50),
   leiklysing varchar(3000), 
   prentadi varchar(1500), 
   notkunarheimildir varchar(1000),
   upplysingar varchar(1000),
   ymislegt varchar(500),
   PRIMARY KEY (id)
);

With this modification, you can now insert new rows without explicitly specifying the id value:

insert into card_games (nafnleiks, leiklysing, prentadi, notkunarheimildir, upplysingar, ymislegt)
values('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' );

Alternatively, you can manually assign values to the id field, ensuring uniqueness to prevent duplicate rows:

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 addressing the missing default value for the primary key field, you can successfully create and populate the card_games table, ensuring data integrity and preventing duplicate rows.

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