Why Does My PHP MySQL Code Throw a 'Fatal Error: No Index Used in Query' Even Though It's Not an Indexing Issue?

Fatal Error: "No Index Used in Query/Prepared Statement"

When executing a query in MySQL using PHP, it's possible to encounter the error "Fatal error: Uncaught exception 'mysqli_sql_exception' with message 'No index used in query/prepared statement'". This error suggests that you're running a query that does not utilize an index for optimization.

In your specific code, the error is not related to the "No index used in query..." warning. The fatal error is occurring due to a combination of factors:

• MySQL reports numerous warnings, even for harmless conditions.
• PHP is configured to throw mysqli_sql_exception for all errors and warnings with mysqli_report(MYSQLI_REPORT_ALL).
• The PHP code does not catch the exception (missing try-catch blocks).

To resolve this error, consider these options:

• Change mysqli_report(...) to MYSQLI_REPORT_STRICT or MYSQLI_REPORT_OFF to suppress warnings.
• Use try-catch blocks to handle mysqli exceptions.
• Alternatively, you could use mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT) to only receive error messages that require immediate attention.

By addressing these issues, you can prevent the fatal error and ensure proper handling of MySQL exceptions in your code.

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