Sql Error: ORA-00933: SQL command not properly ended

Common mistakes and their fixes

Unwanted semicolons: More is not always merrier

Semicolons should signal the end of the party (i.e., the SQL command). Oracle throws a fit (the **ORA-00933** error) with surprise semicolons gatecrashing the command.

```sql
SELECT column FROM table; WHERE condition; -- Suddenly, a wild semicolon appears. This won't do.
SELECT column FROM table WHERE condition;  -- Oracle approves ✅

Syntax structure: Oracle's unique taste

In Oracle's universe, SQL joins ask for **sub-selects** or **inline views**. No more `JOIN` remark please, it's not a friendship band.

```sql
UPDATE (SELECT e.salary, d.budget FROM employees e, departments d WHERE e.department_id = d.id) t SET t.salary = t.salary * 1.1; -- Let's give everyone a raise! Oracle style.

Reserved words and quote-quandary

Don't call Oracle's **reserved words** your columns, it doesn't like to share names. Keep those single quotes in checks, escape if they are part of string literals.

```sql
UPDATE employees SET "GROUP" = 'Support' WHERE id = 1; -- GROUP needs a VIP entry, hence quoted
UPDATE employees SET comments = 'O''Reilly''s offer' WHERE id = 1; -- O'Reilly is at the party, escaping the quote crashers

Kicking out the ORA-00933 error

Precision in identifiers

Ensure your **column and table names** carry right passport. A wrong or misspelled name could have Oracle confused about the journey's end.

### Permissions card

Do you have the Golden ticket (the permissions for the operation)? You might be right about the road, but you can't drive without a license.

Debugging: The detective game

Be Sherlock in your code, have a robust **error handling** and some strategic **debugging** breadcrumbs throughout your command line. Hunt the culprit in your SQL command.

## Advanced damage control
### Mindful use of sub-queries

Tag your sub-queries with alias, trust me it makes them look savvy and easy to spot in the WHERE-class crowd.

SELECT e.name, dept.salary_cap FROM employees e, 
(SELECT department_id, MAX(salary) salary_cap FROM employees GROUP BY department_id) dept 
WHERE e.department_id = dept.department_id; -- This just flows, doesn't it?


Oracle SQL Developer: The quirks

In the world of **Oracle SQL Developer**, semicolons are VIPs (Very Intricate Parts). Use only to announce the end of the command, else get ready for a **ORA-00933** surprise.

```sql
BEGIN
    UPDATE employees SET salary = salary * 1.05; -- Everyone's getting a raise!
    -- Semicolon audition not needed here inside PL/SQL block
END;

Knowledge is power: Use external resources

Perks of the internet - You can swim through several discussions, in-depth bug fixes and best practices to fix ORA-00933 in your specific context.