decimal and double

what is the difference of decimal and double.

my problem is this…

we have here a DTR System
our front end is build from VB6 and our back end is PHP, we use MySQL for database… our front end can’t query in the database if one of our field use DECIMAL, if we change it into DOUBLE, the query is OK… we use our system 2 year now. and only this time our system failed

any IDEA tnx

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