When attempting to execute a query that involves a CASE expression in Oracle SQL, why am I receiving the message "FROM keyword not found where expected"?

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This error message usually indicates a syntax error in your SQL statement. It is likely that you have not structured your SQL statement correctly or have made a mistake in your syntax.

One possible explanation is that you have not included the necessary keywords in your query, such as SELECT or FROM. Another possibility is that you have used incorrect syntax when defining your CASE expression.

To resolve this error, carefully review your SQL statement and make sure that all of the necessary keywords are included and that your syntax is correct. Additionally, you may want to check whether any parentheses or quotation marks are missing or misplaced in your statement.