Why Does My Oracle SQL Query Fail with 'SQL command not properly ended' When Using 'AS' for Table Aliasing?

Oracle SQL Table Aliasing and the "SQL command not properly ended" Error

This article addresses a common Oracle SQL error: "SQL command not properly ended," often encountered when aliasing tables. The error's vagueness makes troubleshooting challenging. The root cause is a misunderstanding of Oracle's syntax for table aliasing.

Unlike many other SQL databases (MySQL, PostgreSQL, SQL Server), Oracle doesn't require or support the AS keyword for table aliasing. Simply placing the alias after the table name suffices.

Correcting the Error

To fix the error, remove the AS keyword from your alias declaration. For example, the corrected version of a problematic query would be:

<code class="language-sql">SELECT G.Guest_ID, G.First_Name, G.Last_Name
FROM Guest G  -- 'as G' removed
JOIN Stay S ON G.Guest_ID = S.Guest_ID
WHERE G.City = 'Miami' AND S.Room = '222';</code>

This minor adjustment resolves the "SQL command not properly ended" error, allowing the query to execute correctly.

Important Consideration: Remember that SQL dialects have variations. Always consult the specific database documentation to ensure correct syntax. This example highlights a key difference in Oracle's table aliasing compared to other popular database systems.

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