Need to consider 'no match ouput data'

Hi All,

I am having a very tedious requirement as follows.

I am doing a look up from a company table and matching data i am updating in a table (in master table). If the look up will have no data then i need to insert those data in 'company' table and generate a ID and then i need to update the master table with the ID.

The process is something like this.

1. Look up in the company table for input data.

2. If data will match the update in Master table.

3. Else insert source data to Company table and generate ID and the update those data to Master table.

I am in a hurry so, any suggestion would be highly appreciable.

Thanks,

sarat chandra sahoo