All Errors

The PostgreSQL error 2201W "Invalid row count in LIMIT clause" occurs when a non-integer, negative, or otherwise invalid value is passed to the LIMIT clause in a SQL query. LIMIT expects a non-negative integer or NULL, and providing strings, floating-point numbers, negative values, or other invalid types triggers this error. Fixing requires ensuring the LIMIT value is properly validated and cast to an integer in your application code.

MySQL throws ER_WINDOW_DUPLICATE_NAME when the WINDOW clause in a SELECT statement defines the same window name more than once. Each named window specification must have a unique identifier to avoid ambiguity when functions reference them.

ERROR 1060 occurs when a CREATE TABLE, ALTER TABLE, or SELECT statement tries to define the same column name twice. Resolve this by identifying the duplicate column and either removing, renaming, or qualifying it uniquely.

This error occurs when defining a window function with an invalid starting boundary in the OVER() clause. The frame start specification violates MySQL's window function syntax requirements.

MySQL throws error 1006 when it cannot create a new database due to file system permissions, disk space issues, or conflicting files. This typically requires checking write permissions on the MySQL data directory and ensuring sufficient disk space.

MySQL reaches its maximum allowed concurrent connections and rejects new connection attempts. This error commonly occurs when max_connections is too low, connections aren't properly closed, or traffic spikes exceed current capacity.

The SQLITE_READONLY_ROLLBACK error occurs when SQLite detects a hot journal (an incomplete rollback journal from a previous crash) but cannot complete the rollback because the database is opened in read-only mode or the filesystem is read-only. This error prevents database access until the journal is either completed or removed.

MySQL does not allow default values on BLOB, TEXT, GEOMETRY, or JSON columns due to how these types allocate memory. Remove the DEFAULT clause or use expression syntax (MySQL 8.0.13+) to fix this error.

This error occurs when you try to insert or update NULL into a column defined with a NOT NULL constraint. MySQL enforces this integrity rule to maintain data quality.

ERROR 1026 (ER_ERROR_ON_WRITE) occurs when MySQL cannot write to temporary, log, or data files. This is typically caused by insufficient disk space, missing file permissions, or a read-only filesystem. Fixing the underlying filesystem issue resolves the error.

Azure Database for PostgreSQL enters read-only mode during planned maintenance to minimize downtime. This occurs when a HA failover transitions the standby to primary or when storage reaches critical thresholds. Applications attempting write operations receive "ERROR: cannot execute INSERT/UPDATE/DELETE in a read-only transaction".

ERROR 1020 (ER_CHECKREAD) occurs when another transaction modifies a record between reads in a multi-user environment. This commonly affects MyISAM tables and can be resolved through retry logic, isolation level adjustments, or row-level locking.

MySQL Error 1065 occurs when an empty or null SQL statement is sent to the server. This typically happens due to programming errors in query construction, malformed dynamic queries, or accidental empty strings in application code.

MySQL Error 1009 occurs when the DROP DATABASE command fails because the server cannot delete the database directory from the file system, usually due to permission issues, active connections, or leftover files.

PostgreSQL parameters with "postmaster" context cannot be changed without restarting the server. Learn how to identify restart-required parameters, apply changes correctly, and verify pending restarts.

The NOSCRIPT error occurs when Redis tries to execute a Lua script using EVALSHA but the script isn't cached on the server. Learn how to properly load scripts and handle this common issue.

MySQL error 1023 indicates that the server failed to close a table, log, or temporary file, typically caused by disk space issues, file permission problems, or file descriptor limits. This guide shows how to diagnose the underlying filesystem problem and resolve it.

MySQL error 1044 occurs when a user lacks sufficient privileges to access a specified database. The user can connect to the MySQL server but does not have permission to use the database. Fix this by granting proper privileges using GRANT statements and FLUSH PRIVILEGES.

PostgreSQL connection failures occur when the database server is unavailable, misconfigured, or unreachable. Fix it by verifying the service is running, checking network connectivity, and validating authentication settings.

This error occurs when you try to use a table option or feature that your storage engine (InnoDB, MyISAM, etc.) does not support. Common causes include deprecated options like ROW_FORMAT=FIXED, unsupported INDEX DIRECTORY clauses, or engine-specific features being used with incompatible engines.