why i should use sqitch or any other software to catch the delta?
When i will export plan-text SQL , git should catch delta automatically? Can you please explain it?
You are correct Git will catch the changes in the plain text files.
What is nice about Sqitch and similar tools is they offer additional functionality, such as deploying to different servers(production, dev, testing, etc), declaring dependencies between changes, rolling back individual changes, etc. To get a sense of what is possible take a look here:
