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What does STRAIGHT_JOIN do in this code ?
SELECT STRAIGHT_JOIN ClosingBalance FROM Accounts WHERE idAccounts = FidDebit;
STRAIGHT_JOIN is intended as an instruction to the MySQL query optimiser that the tables must be joined from left to right in the order they are listed in the query.
http://dev.mysql.com/doc/refman/5.0/en/join.html
As you only have one table in this query, it wouldn’t appear to be doing anything.