Tsql SQL Server 2012创建一个循环超过500个现有列的更新

我希望使用现有值加上5年，用空值更新日期列，PK是

IdentityCourseID

这就是我努力实现的目标：

UPDATE IdentityCourses
SET Expiry = DATEADD(year, 5, IdentityCourses.DateAttained)
WHERE IdentityCourseID = (SELECT IdentityCourseID
                          FROM IdentityCourses 
                          INNER JOIN UnitIdentities ON  IdentityCourses.IdentityID = UnitIdentities.IdentityID
                          WHERE (IdentityCourses.CourseID = 1041) 
                            AND (UnitIdentities.IsActiveMember = 1) 
                            AND (UnitIdentities.EndDate IS NULL) 
                            AND (IdentityCourses.Expiry IS NULL) )

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我认为这会对你有用：

UPDATE ic
SET Expiry = DATEADD(year, 5, ic.DateAttained)
FROM IdentityCourses AS ic
INNER JOIN UnitIdentities AS ui
  ON ic.IdentityID = ui.IdentityID
WHERE ic.CourseID = 1041
  AND ui.IsActiveMember = 1
  AND ui.EndDate IS NULL
  AND ic.Expiry IS NULL

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听起来您需要使用“updatefrom”语法。有关示例，请参见此问题：