Why Am I Getting the ORA-00904: Invalid Identifier Error in My Oracle SQL Query?

ORA 00904: Resolving "Invalid Identifier" Error

Upon encountering the enigmatic "ORA 00904: 'bbb': invalid identifier" error while executing a simple SELECT query, it is imperative to pinpoint the cause. This error often arises when attempting to query a column with a value that is not enclosed in single quotes.

Cause:

The error stems from Oracle's specific interpretation of identifiers (e.g., column names, table names). Unless explicitly enclosed in single quotes, identifiers are treated as database objects. By omitting the quotes, you inadvertently attempted to query a non-existent column (uname) instead of a specific value ("bbb").

Solution:

To resolve this issue, rectify the query by enclosing the value you wish to query in single quotes. Here is the corrected query:

select fname, lname
from reg1
where uname='bbb';

By adding the single quotes around "bbb," you unequivocally specify that you are searching for a value rather than a column. This will enable Oracle to accurately execute the query and retrieve the desired data.

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