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Posted by --CELKO-- on 07/11/06 18:11
>>. I have a CreditsTable and a DebitsTable and I am trying to create a querry that sums up the info from each per UserID and returns TotalCredits, TotalDebits, and a Ballance. <<
This design flaw is called attribute splitting. You need a single
table, say Accounts, that shows events related to each account. Also,
we do not have BOOLEAN data types in SQL. It would be much more
meaningful to show the time that a posting was made to the account.
CREATE TABLE Accounts
(user_id INTEGER NOT NULL,
posting_date DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
posting_amt DECIMAL (12,4) NOT NULL
CHECK (posting_amt <> 0.00));
We have negative numbers and do not have to use credit/debit columns as
they did in Roman times.
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