小编Div*_*kar的帖子

下面的SQL查询是普通查询还是相关子查询？

SELECT UserID,
       FirstName,
       LastName,
       DOB,
       GFName,
       GLName,
       LoginName,
       LoginEffectiveDate,
       LoginExpiryDate,
       Password,
       Email,
       ReportingTo,
       Mobile,
       CommunicationPreference,
       IsActive
FROM   (SELECT row_number() OVER (ORDER BY FirstName) AS Row,
               UserID,
               FirstName,
               LastName,
               DOB,
               GFName,
               GLName,
               LoginName,
               LoginEffectiveDate,
               LoginExpiryDate,
               Password,
               Email,
               ReportingTo,
               Mobile,
               CommunicationPreference,
               IsActive
        FROM   DivakarUserRegistration)  T

此外,有人可以说明两者之间的差异

在SQL（最好是SQL Server 2008 R2）中使用约束和规则之间有什么区别。任何人都可以通过实时示例进行解释和演示