Common SQL Errors and How to Fix Them
Browse all documented SQL errors with detailed explanations, root causes, and step-by-step fixes.
Error parsing the window function 'ROW_NUMBER()' in the subquery: 'SELECT * FROM
This error occurs when the SQL parser is unable to correctly interpret the syntax of a query, often due to a misplacemen…
Cannot create index on column 'latitude' because the column is of type numeric b
This error occurs when the data type of a column specified in the CREATE INDEX statement does not match the index type s…
Error parsing expression for ORDER BY clause: 'id' does not exist in the query
This error occurs when the SQL framework is unable to parse the ORDER BY clause due to a non-existent column being refer…
Misplaced keyword in SQL query near 'GROUP'
This error occurs when SQL syntax is incorrect, typically when a keyword is misplaced or not properly used, such as usin…
Cannot optimize for 'index' on table 'orders' because the index is too wide and
This error occurs when the SQL query optimizer is unable to optimize a query because the index on the specified table is…
Error 1215: Cannot add foreign key constraint
This error occurs when you try to create a foreign key constraint on a column that already contains data with values tha…
ORA-04063: view 'HR.EMPLOYEES_V' has a RECURSIVE WITH reference to itself, but n
This error occurs when a view or a query attempts to reference itself in a recursive WITH clause, which is not allowed i…
SQL Error (1146): Table 'mydb.mycustomer' doesn't exist
This error occurs when the database engine cannot find a specified table in the database. The table may have been delete…
ORA-00904: 'column_name' is not a valid identifier
This error occurs when the SQL parser is unable to identify a column name in the query. This is often due to a typo or i…
ORA-01502: index contains duplicate key values starting from row 1
This error occurs when trying to create an index on a column that contains duplicate values. In an index, each value mus…
Cannot execute COMMIT when in read-only transaction
This error occurs when you attempt to commit changes to a database within a transaction that has been marked as read-onl…
ORA-00979: not a GROUP BY expression
This error occurs when a SELECT statement includes a column that is not included in the GROUP BY clause, or when a SELEC…
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