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pease help me i will send for you sample project not work with this code IFNULL(zakaz.cost, 0) - (SELECT IFNULL(db.dbCost, 0) FROM db WHERE db.id=zakaz.id_db).......please check for me....thanks

thanks jean.brezhonek....YES MY FRIEND I WANT MAKE SAMPLE PROJECT FOR SYSTEM BOOKING HOTEL....WHEN CUSTOMER NEED BOOK ROOM 1....CLICK ON BUTTON1......TO BE (ON) ...IT IS NOW BOOKED ROOM1.

Thank you very mutch Mr.Derek.....yes exactly ...

i sent my details gmail to your email support@drive-software.com

yes i do it all ....but i get the same error....please look the photo

thanks for answer .... i dont know this is working on software my visual database but i  need code like this:
if this code working on software please help me i need make like this my software project...in link file zip i think all code

function conv2(x:integer):string;forward;
function conv3(x:integer):string;forward;

{***********Fonction_1*************}

function conv1(x:integer):string;
var temp:string;
begin
if (x>19) and (x<100) then conv2(x)
else if (x>100) then conv3(x)
else begin

case x of
1:temp:='un ';
2:temp:='deux ';
3:temp:='trois ';
4:temp:='quatre ';
5:temp:='cinq ';
6:temp:='six ';
7:temp:='sept ';
8:temp:='huit ';
9:temp:='neuf ';
10:temp:='dix ';
11:temp:='onze ';
12:temp:='douze ';
13:temp:='treize ';
14:temp:='quatorze ';
15:temp:='quinze ';
16:temp:='seize ';
17:temp:='dix sept ';
18:temp:='dix huit ';
19:temp:='dix neuf ';
end;
conv1:=temp;
end;
end;

Failed:1
Delivery:0

but the true result is and really gives me is :
failed :0
delivery:2
becaouse i sent  one sms for to number mobile tpgether .

ok.thank you Dmitry