It is possible to modify an existing table's data using SQL. There are commands for inserting new data, deleting existing data and modifying existing data.
Format
Inserting a new row of data, list of values must match order of table structure.
(You must include NULL if value is blank)
INSERT INTO table VALUES(<list of values>)l
Insert multiple rows of data at once (Not available in Microsoft Access)
INSERT INTO table VALUES (<list of values>),
(<list of values>),
(<list of values>);
Delete row of data from table
DELETE FROM table WHERE <condition>
Modify existing row's value
UPDATE table SET attribute - <new value> WHERE <condition>
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