Why am I Getting the \'Field \'display_name\' doesn\'t have default value\' MySQL Error?

MySql Error: "Field 'display_name' doesn't have default value" Resolved

While migrating from a MAMP installation to a native Apache, MySql, and PHP environment, a MySql error 1364 surfaced, indicating the absence of a default value for the 'display_name' field. This issue arose during INSERT commands, apparently due to the inability to leave the field blank as was previously possible.

Identifying the Root Cause

The foundational cause of this issue lies in MySql's potential STRICT mode. In this stringent mode, the database enforces the assignment of default values or non-null values to all columns, disallowing the insertion of blank entries.

Resolving the Issue

To rectify this situation, there are two primary approaches:

1. Disabling STRICT Mode:

   Execute the SQL command:

   <code class="sql">SET GLOBAL sql_mode=''</code>

2. Modifying my.cnf:

   a. Navigate to the my.cnf file, typically located in /etc/mysql/.
   b. Locate or add the following line:

   sql_mode=

   c. Restart the MySQL service.

Additional Considerations

• If neither approach resolves the issue, check for any table- or column-level constraints that may be preventing null values.
• Ensure that the database user has sufficient privileges to insert data into the table in question.
• Verify that the column definition includes a default value or allows null values.

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