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# Appendix A. MDX Function and Operator Reference

This appendix is a detailed reference to the functions and operators of standard MDX, and extensions as implemented in Microsoft's Analysis Services 2000 and 2005 and Hyperion's Essbase 9. The main body of the appendix lists the functions and operators in alphabetical order, along with any arguments and the result's data type. We have included a pair of indexes at the beginning to help you navigate.

# Index to Functions

We have found that two different types of indexes are useful for looking up a function or operator: by name and by return type.

## Alphabetical Index

• Abs(): 542

• Aggregate(): 542

• .AllMembers(): 544

• Ancestor(): 544

• Ancestors(): 544

• And: 545

• Ascendants(): 546

• Attribute(): 546

• Avg(): 546

• Axis(): 546

• BottomCount(): 548

• BottomPercent(): 548

• BottomSum(): 548

• CalculationCurrentPass(): 549

• CalculationPassValue(): 549

• Call: 549

• CASE: 550

• .Children: 551

• ClosingPeriod(): 551

• CoalesceEmpty(): 551

• Correlation(): 552

• Count(): 553

• .Count: 553

• Cousin(): 553

• Covariance(): 554

• CovarianceN(): 554

• Crossjoin(): 555

• .Current: 555

• .CurrentOrdinal: 556

• .CurrentMember: 557

• CurrentTuple(): 556

• CustomData: 557

• .DataMember: 557

• .DefaultMember: 557

• Descendants(): 558

• .Dimension: 562

• Dimensions(): 562

• Distinct(): 563

• DistinctCount(): 564

• DrillDownByLayer(): 564

• DrillDownLevel(): 564

• DrillDownLevelBottom(): 565

• DrillDownLevelTop(): 566

• DrillDownMember(): 567

• DrillDownMemberBottom(): 569

• DrillDownMemberTop(): 569

• DrillUpByLayer(): 570

• DrillUpLevel(): 570

• DrillUpMember(): 570

• Error(): ...

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