PostgresDB 2202E: Array Subscript Error

Invalid subscript used in an array.

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What is

PostgresDB 2202E: Array Subscript Error

?

When encountering the error 2202E: Array Subscript Error in PostgreSQL, it typically indicates an issue with an array operation, such as attempting to access an array element with an index outside its bounds. Here are specific actions you can take immediately:

Identify the Query Causing the Error: Review the application or system logs to find the exact query that caused the error. This information is crucial to understand what operation failed.
Review the Query and Data: Examine the query you identified to understand which array operation failed. Look for array accesses, like array[index], and focus on the indexes used.
Check Array Bounds: Use SQL queries to inspect the arrays involved in the error. Determine their lengths to ensure that your access indices are within valid ranges. You can use the array_length() function to find the length of an array. For example, if your failing query involves an array my_array, run:
SELECT array_length(my_array, 1) FROM your_table WHERE condition_to_identify_the_row;
Replace your_table and condition_to_identify_the_row with the actual table name and condition to select the row(s) involved in the error.
Adjust the Query: Based on your findings, if the index is out of bounds, adjust the query to ensure it accesses only valid positions within the array. This might involve adding checks on the array length or correcting the logic that determines the index values.
Test the Adjusted Query: Before applying the changes to your application, test the adjusted query in a development or staging environment to make sure it resolves the error without causing other issues.
Review Related Application Logic: If the error was due to an incorrect index calculation or a logic flaw in your application, review related parts of your application code to prevent similar issues. This might involve adding checks or validations for array indices elsewhere in your code.

By following these steps, you can identify and correct the causes of the 2202E: Array Subscript Error in PostgreSQL.

Attached error:

PostgresDB 2202E: Array Subscript Error

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