This code implements a simple DBMS system. This DBMS will allow the user to type in simple DDL statements and build a system catalog (set of packed descriptors). Once the table definition is in place, the user can insert, update, delete, and select from a table.

Data type supports: INT, CHAR can be SUM, AVG, COUNT

Command Syntax:

1. CREATE TABLE table_name ( { column_name <data_type> [NOT NULL] } )
2. DROP TABLE table_name
3. LIST TABLE
4. LIST SCHEMA FOR table_name [TO report_filename]
5. INSERT INTO table_name VALUES ( { data_value } )
6. DELETE FROM table_name [ WHERE column_name <relational_operator> data_value ]
7. UPDATE table_name SET column = data_value [ WHERE column_name <relational_operator> data_value ]
8. SELECT { column_name } FROM table_name [ WHERE column_name [(AND | OR) column_name ] ] [ ORDER BY column_name [DESC] ] || SELECT (column_name) FROM table_name [ WHERE column_name [(AND | OR) column_name ] ] [ ORDER BY column_name [DESC] ]
9. BACKUP TO
10. RESTORE FROM [WITHOUT RF]
11. ROLLFORWARD [TO ]