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QuestionFailed to connect Mysql shared server database with Workbench 8.0.20 tool. Pin
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Questionatabase constraints must follow relvar constraints Pin
Tara1112-May-20 15:15
MemberTara1112-May-20 15:15 
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 3:32
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AnswerRe: Convert raw byte[8192] of SQL Server XML datatype into a C# string? Pin
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QuestionRead data from Azure database with C#-application, without installing a lot of applications? Pin
arnold_w25-Apr-20 8:24
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AnswerRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Richard MacCutchan25-Apr-20 8:42
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arnold_w25-Apr-20 8:45
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GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Mycroft Holmes25-Apr-20 13:42
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GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
arnold_w25-Apr-20 13:58
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GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Mycroft Holmes25-Apr-20 14:02
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GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
arnold_w25-Apr-20 21:55
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GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Richard MacCutchan25-Apr-20 22:09
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GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
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GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
arnold_w26-Apr-20 0:31
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GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Richard MacCutchan26-Apr-20 0:35
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GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
arnold_w27-Apr-20 0:10
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GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Richard MacCutchan27-Apr-20 0:23
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GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
arnold_w27-Apr-20 1:33
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GeneralRe: Read data from Azure database with C#-application, without installing a lot of applications? Pin
Victor Nijegorodov27-Apr-20 1:48
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