Lag (MDX)
Returns the member that is a specified number of positions before a specified member at the member's level.
Syntax
Member_Expression.Lag(Index)
Arguments
Member_Expression
A valid Multidimensional Expressions (MDX) expression that returns a member.
Index
A valid numeric expression that specifies the number of member positions to lag.
Remarks
Member positions within a level are determined by the attribute hierarchy's natural order. The numbering of the positions is zero-based.
If the specified lag is zero, the Lag function returns the specified member itself.
If the specified lag is negative, the Lag function returns a subsequent member.
Lag(1) is equivalent to the PrevMember function. Lag(-1) is equivalent to the NextMember function.
The Lag function is similar to the Lead function, except that the Lead function looks in the opposite direction to the Lag function. That is, Lag(n) is equivalent to Lead(-n).
Example
The following example returns the value for December 2001:
SELECT [Date].[Fiscal].[Month].[February 2002].Lag(2) ON 0
FROM [Adventure Works]
The following example returns the value for March 2002:
SELECT [Date].[Fiscal].[Month].[February 2002].Lag(-1) ON 0
FROM [Adventure Works]