Beginning Microsoft SQL Server 2008 ... - S3 Tech Training

Appendix A: System Functions
INDEX_COL
The INDEX_COL function returns the indexed column name. The syntax is as follows:
INDEX_COL(‘’, , )
The table parameter specifies the name of the table, index_id specifies the ID of the index, and
key_id specifies the ID of the key.
INDEXKEY_PROPERTY
This function returns information about the index key.
INDEXKEY_PROPERTY(, , , )
The table_id parameter is the numerical ID of data type int, which defines the table you wish to
inspect. Use OBJECT_ID to find the numerical table_id. index_id specifies the ID of the index, and
is also of data type int. key_id specifies the index column position of the key; for example, with a
key of three columns, setting this value to 2 will determine that you are wishing to inspect the middle
column. Finally, the property is the character string identifier of one of two properties you wish to
find the setting of. The two possible values are ColumnId, which will return the physical column ID,
and IsDescending, which returns the order that the column is sorted (1 is for descending and 0 is
ascending).
INDEXPROPERTY
622
The INDEXPROPERTY function returns the setting of a specified index property, given the table ID, index
name, and property name. The syntax is as follows:
INDEXPROPERTY(, , )
The property parameter specifies the property of the index that is to be queried. The property parameter
can be one of these possible values:
❑ IndexDepth — The depth of the index.
❑ IsAutoStatistic — The index was created by the autocreate statistics option of
sp_dboption.
❑ IsClustered — The index is clustered.
❑ IsStatistics — The index was created by the CREATE STATISTICS statement or by the autocreate
statistics option of sp_dboption.
❑ IsUnique — The index is unique.
❑ IndexFillFactor — The index specifies its own fill factor.
❑ IsPadIndex — The index specifies space to leave open on each interior node.
❑ IsFulltextKey — The index is the full-text key for a table.
❑ IsHypothetical — The index is hypothetical and cannot be used directly as a data access path.