PostgreSQL Error 2202H: Invalid TABLESAMPLE Argument
PostgreSQL error 2202H (invalid_tablesample_argument) occurs when you pass an out-of-range or otherwise invalid argument to a TABLESAMPLE method. The two built-in methods, BERNOULLI and SYSTEM, both require a percentage value strictly between 0 and 100 (inclusive boundaries vary by implementation). This error frequently catches developers off-guard when building dynamic sampling queries or migrating code from other databases.
Top 3 Causes
1. Sampling percentage is out of the valid range (0–100)
The most common cause is passing a value greater than 100 or less than or equal to 0. Developers sometimes confuse the percentage format (10 = 10%) with a decimal fraction (0.1 = 10% in some other tools).
