Returned when the TABLESAMPLE clause receives a NULL, negative, or out-of-range (0-100) sample size or an invalid REPEATABLE seed.
invalid_tablesample_argument is raised by PostgreSQL when TABLESAMPLE gets a bad size or seed. Supply a numeric sample between 0 and 100 and use a positive integer seed to fix the error.
invalid_tablesample_argument
PostgreSQL throws error code 2202H with condition name invalid_tablesample_argument when a TABLESAMPLE clause receives an illegal argument.
The argument can be the sample size percentage or the seed passed to the REPEATABLE sub-clause. Any NULL, negative, or out-of-range value triggers the exception before query execution.
Out-of-range size causes the majority of cases. PostgreSQL expects a value greater than 0 and less than or equal to 100.
A common typo is using 150, 1.5, or a negative value.
NULL or non-numeric expressions also break parsing. Dynamic SQL that interpolates an empty variable will surface the same error at runtime.
Invalid REPEATABLE seed values, such as NULL or a floating-point number, are rejected because the seed must be a positive 32-bit integer.
Validate the TABLESAMPLE percentage before running the statement.
Cast or round user input to a numeric range of 0–100.
Ensure REPEATABLE receives an integer constant or expression that always resolves to a positive integer. Use COALESCE or CHECK constraints in dynamic queries.
Parameter-driven analytics dashboards often pass user-supplied sample rates.
Enforce bounds in the application layer and default to 10 when no value is provided.
Mistyped literals in ad-hoc SQL can be caught early with the Galaxy SQL editor’s inline linting, which warns when the percentage exceeds 100 or is negative.
Keep TABLESAMPLE arguments in named variables and validate them with a CHECK constraint or ASSERT.
Create helper functions that clamp values to the valid range and always return an integer for REPEATABLE seeds.
error 42804 wrong_object_type - occurs when TABLESAMPLE is used on a view.
Convert the view to a materialized view.
error 22P02 invalid_text_representation - appears when the sample argument is supplied as a string.
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No. PostgreSQL only supports TABLESAMPLE on base tables. Use a materialized view instead.
No. Values must be greater than 0. Use the smallest practical value like 0.01 for very small samples.
REPEATABLE accepts any expression that resolves to a positive 32-bit integer. Floating numbers or text fail.
Galaxy’s context-aware linting flags out-of-range TABLESAMPLE arguments in real time, reducing runtime failures.
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