Why Does My Oracle CONCAT Function Give an 'Invalid Number of Arguments' Error?

Invalid Number of Arguments Error in CONCAT Function

For the given problem of formatting output in the desired format, the CONCAT function is employed. However, an error arises due to an incorrect number of arguments.

Let's analyze the code:

SELECT CONCAT(Name,"(",SUBSTR(Occupation,1,1),")") FROM OCCUPATIONS;

The CONCAT function in Oracle accepts a maximum of two arguments. It concatenates two strings, but in this case, three strings are being passed: Name, "(", and SUBSTR(Occupation,1,1). This results in the "invalid number of arguments" error.

The Solution:

To resolve this, we can use the concatenation operator (||) instead, which allows for multiple strings to be concatenated. The corrected code is:

SELECT Name || '(' || SUBSTR(Occupation,1,1) || ')' FROM OCCUPATIONS;

Additionally, remember to use single quotes (') to enclose string literals, as double quotes (") are used for identifiers in Oracle SQL.

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