Common SQL Errors and How to Fix Them
Browse all documented SQL errors with detailed explanations, root causes, and step-by-step fixes.
Error copying to 0: ORA-12519: TNS:internal connection pool has reached the maxi
This error occurs when the database connection pool has reached its maximum number of retries, indicating that the datab…
SQL query syntax error. Incorrect usage of ORDER BY clause near column name 'las
A syntax error occurs when SQL is unable to parse a query due to incorrect or missing syntax. In this case, the ORDER BY…
SQLSTATE[HY000]: General error: 1216 Cannot delete or update a parent row: a for
This error occurs when attempting to delete or update a record in a table that has a foreign key relationship with anoth…
SQL syntax; check the manual that corresponds to your MySQL server version for t
This error occurs when the SQL syntax is incorrect or does not match the expected format. It can be caused by missing or…
Cannot add foreign key constraint 'fk_orders_customers' because table 'orders' d
This error occurs when you're trying to add a foreign key constraint to a table, but the referenced table does not exist…
Have a SQL error that's not listed? Get an instant explanation.
Explain Another Error