ISINDEX

ISINDEX

Returns the type of index for a SAS table column

Category: SAS Table

Syntax
Details
Example
See Also

Syntax

index=ISINDEX(table-id,col-name);

index

contains the type of the index:

(blank): No index has been created for the specified column.
BOTH: The column is a member of both simple and composite indexes.
COMP: The column is a member of a composite index.
REG: The column is a regular (simple) index.

Type: Character

table-id

is the identifier that was assigned when the table was opened. If table-id is invalid, the program halts.

Type: Numeric

col-name

is the name of a column in the SAS table. If col-name is not a column in the table, then ISINDEX returns a blank value.

Type: Character

Details

An index is an auxiliary data structure used to assist in the location (that is, selection) of rows that are specified by the value of a column. An index is called a simple index if it contains the value of only one column. A composite index merges the values for more than one column to form a single value. A given SAS table can have multiple simple indexes, composite indexes, or any combination of these.

You can create indexes using

the ICREATE function in SCL
the DATASETS and SQL procedures in base SAS software
SAS/IML software
the CONTENTS function in SCL
the ACCESS procedure of SAS/ACCESS software.

Example

Return the type of index for the FNAME column in the SAS table WORK.DATAONE:

dsid=open('work.dataone','i');
ixtype=isindex(dsid,'fname');

See Also

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