queries on mysql

[Fred Verschueren]

Ls,

I'm currently working with version 2.3.17 with mysql as database.

I need to do a lot of changes in my accounts, moving a lot of entries 
from one account to another.

Now I was wondering if this could be done with some queries (SQL) on the 
database.

I'm wiling to investigate this and if I have a solution give this back 
to the community but to do this investigation I need to know the layout 
of the DB: what is the meaning of each table, the links between the 
tables aso.

My questions:

- is this investigation already done and what is the outcome?
- where can I find the needed information about the DB.

Kind regards,
Fred Verschueren.