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How to Fix PostgreSQL Error 42883

When we work with PostgreSQL, the PostgreSQL error 42883 can be a common problem.

This error lets us know that PostgreSQL does not recognize the function we are trying to call. The error message looks like this:

ERROR: function function_name(arguments) does not exist
LINE n: SELECT function_name(arguments);
HINT: No function matches the given name and argument types. You might need to add explicit type casts.

Common Causes & Fixes

Function Name Mismatch

Simple typos in the function name can lead to this error. Additionally, using an incorrect function name will also cause an error.

Fix: So, make sure the function name is spelled correctly.

Argument Type Mismatch

Another cause for the error is passing arguments that don’t match the expected data types. Also, entering too few or too many arguments.

Fix: Make sure the correct number of arguments are passed and that they match the expected data types.

If the argument types do not match exactly, we have to cast them explicitly:

SELECT function_name(arguments::type);

Function Not Defined

We will get an error message if the function has not been created in the database. It also occurs if the function exists in a different schema that is not included in the search path.

Fix: We can use the \df command in the psql terminal to list all functions and verify the existence of the function:

\df function_name

Furthermore, confirm the function exists in the current search path:

SHOW search_path;

If the function is in a different schema, we have to qualify the function name with the schema name:

SELECT schema_name.function_name(arguments);

Case Sensitivity

PostgreSQL is case-sensitive by default, so function names must match the exact case.

Fix: So, make sure the function name and argument names are in the correct case. We also need to enclose function names in double quotes if they are defined with mixed or upper case:

SELECT "functionName"(arguments);>/code>

Let us know in the comments if you need further help with the error 42883 in PostgreSQL.

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Conclusion

In brief, our Support Experts demonstrated how to fix PostgreSQL error 42883.