- Ignored case sensitivity of commands
- Realized SELECT Clause
- Realized FROM Clause
- Realized WHERE Clause
- Realized FROM Clause for more than two tables
- Realizing SELECT * (select all) command
- Realizing ORDER BY Clause
- Realizing Aggregate Function including avg, min, max, count
- Realizing GROUP BY Clause
- Optimizing the error processing
- Optimizing the speed/efficiency of data handling