1. Updateing a Master File from A Transaction File
By Daniel Gillo

2. First you need to sort the data

3. Transaction file
113 – Clare +100
127 – Anton +100
098 – Ron +100
115 – Johann +100
096 – Ben +100
160 – Daniel +300
076 – Mrs. Janesko +100

4. To update the file you need to create a new master file and then write the infromation from the old master file with the updates from the transaction file to the new master file. Find the ifromation with the lowest key and write that infromation to the new file.

5. Old Master File
New Master File
Transaction file
076 – Mrs. Janesko +100
076 – Mrs. Janesko 200
076 –Mrs. Janesko 300
096 – Ben +100
080 – Gillo 150
098 – Ron +100
090 – Bob 300
113 – Clare +100
096 – Ben 200
115 – Johann +100
096 – Ben 300
098 – Ron 200
127 – Anton +100
098 – Ron 300
160 – Daniel +300
100 – Dave 200
113 – Clare 200
113 – Claire 300
115 – Johann 200
115 – Johann 300
120 – Gerdrud 300
127 – Anton 200
127 – Anton 300

6. Done! New Master File 076 – Mrs. Janesko 300 080 – Gillo 150
090 – Bob 300
096 – Ben 300
098 – Ron 300
100 – Dave 200
113 – Claire 300
115 – Johann 300
120 – Gerdrud 300
127 – Anton 300
160 – Daniel 300
Done!