🔴 ORA-00933 Error Meaning

Oracle is telling you:

👉 “Your SQL statement is not written correctly or is incomplete.”

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🔎 Common Causes & Fixes

1️⃣ Extra Semicolon in Tools / Applications

In tools like JDBC, Python, etc., a semicolon can cause issues.

❌ Wrong:

SELECT * FROM emp;

✅ Correct (in some applications):

SELECT * FROM emp

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2️⃣ Incorrect ORDER BY in Subquery

❌ Wrong:

SELECT * FROM (
  SELECT * FROM emp ORDER BY empno
);

👉 ORDER BY not allowed inside subquery (unless using FETCH / ROWNUM)

✅ Correct:

SELECT * FROM (
  SELECT * FROM emp
) ORDER BY empno;

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🛠 How to Troubleshoot Quickly

When you see ORA-00933:

✔ Check last line of SQL
✔ Remove extra commas
✔ Verify clause order (SELECT → FROM → WHERE → ORDER BY)
✔ Avoid MySQL/PostgreSQL syntax
✔ Test query step-by-step

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