The 2201X error code in PostgreSQL indicates an invalid_row_count_in_result_offset_clause. This error occurs when using the OFFSET clause in a SQL query, and the row count specified is not valid. The OFFSET clause is used to skip a specific number of rows before beginning to return rows from the query.
A common cause for this error is providing a non-integer value or a negative integer as the argument to the OFFSET clause. The OFFSET value must be zero or a positive integer.
To diagnose this issue, you should look at the OFFSET clause in your query and check the value that you’re providing. Here’s an example that would result in the 2201X error:
SELECT * FROM my_table OFFSET 'ten';In this case, the error occurs because 'ten' is not an integer.
Here’s another example that would cause an error:
SELECT * FROM my_table OFFSET -5;This would also result in an invalid_row_count_in_result_offset_clause error because -5 is a negative integer.
To fix this issue, you should ensure that the argument for OFFSET is a non-negative integer. Here’s a corrected example:
SELECT * FROM my_table OFFSET 10;In this correct example, the query will skip the first 10 rows and then return the remaining rows.
If you’re dynamically constructing the SQL query, make sure that the variable or parameter you’re using in the OFFSET clause is being properly validated as a non-negative integer before the query is executed.
For more detailed information on PostgreSQL error codes, you can refer to the official PostgreSQL documentation on error codes, which lists 2201X under the Class 22 — Data Exception section. Always ensure that the value for OFFSET is a valid non-negative integer to avoid this error.