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A type of (18,4) should be treated internally as Currency.
To avoid rounding problems.

But I don't know how to do it in Zeos.

But parsing on the client side is not preparing on the server side. When you send the sql to the database, like firebird, the statement will be prepared there (for example finding the optimal indexes to use, reserving memory and so on). And this process can cost a lot of time compared to fetching ro...

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http://www.mengoni.it/Software/

Use a normal Query (TZQuery).
This is a selectable Stored Procedure.

Show us the full SQL statement, that raises the error.

TField.Clear; // sets the Field to null

A TTime is only from 00:00:00 to 23:59:59.
If I have to sum times I use a TDateTime and format the output only as hours. So the internal TDateTime Value of 1.5 will result in 36:00 hours.

Firebird Connection.
I get a SInvalidInputParameterCount-Exception in an Insert Statement with 2 Parameters (the InParamCount is 1).
Any hints why I get it?

Andreas