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GeneralRe: driver oracle 9i por .net Pin
Member 148339587-Jun-20 21:58
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GeneralRe: driver oracle 9i por .net Pin
Jörgen Andersson7-Jun-20 23:20
professionalJörgen Andersson7-Jun-20 23:20 
GeneralRe: driver oracle 9i por .net Pin
Member 148339589-Jun-20 4:27
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GeneralRe: driver oracle 9i por .net Pin
Jörgen Andersson9-Jun-20 4:45
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GeneralRe: driver oracle 9i por .net Pin
Member 148339589-Jun-20 4:27
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QuestionFailed to connect Mysql shared server database with Workbench 8.0.20 tool. Pin
Member 1167692314-May-20 22:49
Member 1167692314-May-20 22:49 
AnswerRe: Failed to connect Mysql shared server database with Workbench 8.0.20 tool. Pin
Bohdan Stupak29-Jun-20 4:26
professionalBohdan Stupak29-Jun-20 4:26 
Questionatabase constraints must follow relvar constraints Pin
Tara1112-May-20 14:15
Tara1112-May-20 14:15 
The text below is from "Introduction to Database Systems, J. Date". I can't the bolded part. why since Relvar constraints must obviously be checked immediately, must database constraints be checked immediately too? Why database constraints must follow relvar constraints, please?

The previous edition of this book stated that relvar constraints were checked immediately but database constraints were checked at end-of-transaction (a position that many writers concur with, though they usually use different terminology). But The Principle of Interchangeability (of base and derived relvars--see Chapter 9) implies that the very same real-world constraint might be a relvar constraint with one design for the database and a database constraint with another! Since relvar constraints must obviously be checked immediately, it follows that database constraints must be checked immediately too. .
QuestionConvert raw byte[8192] of SQL Server XML datatype into a C# string? Pin
arnold_w1-May-20 2:32
arnold_w1-May-20 2:32 
AnswerRe: Convert raw byte[8192] of SQL Server XML datatype into a C# string? Pin
phil.o1-May-20 3:06
professionalphil.o1-May-20 3:06 
QuestionRead data from Azure database with C#-application, without installing a lot of applications? Pin
arnold_w25-Apr-20 7:24
arnold_w25-Apr-20 7:24 
AnswerRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Richard MacCutchan25-Apr-20 7:42
mveRichard MacCutchan25-Apr-20 7:42 
GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
arnold_w25-Apr-20 7:45
arnold_w25-Apr-20 7:45 
GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Mycroft Holmes25-Apr-20 12:42
professionalMycroft Holmes25-Apr-20 12:42 
GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
arnold_w25-Apr-20 12:58
arnold_w25-Apr-20 12:58 
GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Mycroft Holmes25-Apr-20 13:02
professionalMycroft Holmes25-Apr-20 13:02 
GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
arnold_w25-Apr-20 20:55
arnold_w25-Apr-20 20:55 
GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Richard MacCutchan25-Apr-20 21:09
mveRichard MacCutchan25-Apr-20 21:09 
GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Richard MacCutchan25-Apr-20 21:08
mveRichard MacCutchan25-Apr-20 21:08 
GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
arnold_w25-Apr-20 23:31
arnold_w25-Apr-20 23:31 
GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Richard MacCutchan25-Apr-20 23:35
mveRichard MacCutchan25-Apr-20 23:35 
GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
arnold_w26-Apr-20 23:10
arnold_w26-Apr-20 23:10 
GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Richard MacCutchan26-Apr-20 23:23
mveRichard MacCutchan26-Apr-20 23:23 
GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
arnold_w27-Apr-20 0:33
arnold_w27-Apr-20 0:33 
GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Victor Nijegorodov27-Apr-20 0:48
Victor Nijegorodov27-Apr-20 0:48 

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