Complete guide to SQL database error codes from MySQL, PostgreSQL, and other databases.
MySQL error occurs when trying to insert a duplicate value in a column with UNIQUE constraint.
MySQL authentication failed due to incorrect username or password.
MySQL client cannot establish connection to the database server.
The specified column does not exist in the table.
The specified table is not found in the database.
Foreign key constraint cannot be created due to data type mismatch or missing referenced column.
Foreign key constraint fails because referenced value doesn't exist in parent table.
Trying to insert a row without providing value for a NOT NULL column that has no default.
Value exceeds the maximum allowed for the column data type.
Attempting to create a table that already exists in the database.
Generic SQL error for constraint violations (unique, foreign key, check constraints).
The table or view specified in the query does not exist.
SQL syntax error in the query statement.
The number of columns in INSERT statement doesn't match the number of values provided.
User doesn't have permission to execute the SQL command.
Query timed out waiting for a table lock, usually due to long-running transactions.