Master-Detail Relation

[siva27]

Hi All,

I have a Form,Which consists of Master-Detail Relation.I can able to insert the data through Form.
When i query i will get all the data in the data base.
For Ex : again i hvae to insert new record in the Detail level by keeping Master level same it shold not be changed.

If i query next time i have to get all the 2records with Master.And i should not update the exsisting Old records.
Can any one help me to slove this problem.
Give me simple code on pl/sql if having...

Regards
Siva