How to diagnose and fix the 2202G invalid_tablesample_repeat error code in Postgres.

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The 2202G error code in PostgreSQL, labeled as invalid_tablesample_repeat, indicates an issue with the TABLESAMPLE clause, which is used to retrieve a subset of rows from a table randomly. This error occurs when the REPEATABLE argument in the TABLESAMPLE clause is not used correctly. The REPEATABLE argument expects a seed value, which is a number that can be used to generate a pseudo-random sample that can be repeated in subsequent calls.

To diagnose and fix the 2202G error code, you should:

  1. Ensure that you are using the TABLESAMPLE clause correctly.
  2. Check that the REPEATABLE argument, if used, is followed by a numeric literal.

Here’s an example of how to use the TABLESAMPLE clause correctly:

SELECT * FROM your_table TABLESAMPLE BERNOULLI (50) REPEATABLE (42);

In this example, BERNOULLI (50) means that each row has a 50% chance of being included in the sample, and REPEATABLE (42) means that the same pseudo-random sample can be selected again by using the same seed value 42.

If you omit the REPEATABLE argument or use a non-numeric value, you might encounter the 2202G error. Correct usage of the REPEATABLE argument with a numeric literal will resolve this error.

Remember, the TABLESAMPLE clause and the REPEATABLE argument are specific to PostgreSQL, and their syntax or availability might differ in other database systems. Always consult the PostgreSQL documentation for the most accurate and detailed information regarding error codes and their resolutions.

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