Difference between revisions of "REFERENCES()"

Revision as of 12:41, 9 June 2009

Class

Indexing

Purpose

Function to perform a cross-table lookup for a specified key expression

Syntax

REFERENCES(<key expression>, <workarea | alias> [,<tag name>])

See Also

ALIAS(), FIND, INDEX, KEY(), LOOKUP(), RLOOKUP(), SEEK, SEEK(), SET RELATION, TAG(), TAGCOUNT(), TAGNO()

Description

The REFERENCES() function looks up the specified <key expression> in the master tag index of the specified <workarea | alias>. The <workarea | alias> is the workarea or alias name of an open table. To search in a tag index which is not the current master index, the optional <tag name> parameter can be used. The tag name must be specified as a string.

The REFERENCES() function returns True (.T.) or False (.F.), depending on the success of the lookup operation.

Please see the RLOOKUP() function for cross-table lookups using single indexes (.ndx).

Example

use customer.rdb
index on account_no tag account_no
index on upper(last_name) tag uplast
index on zip tag zip
? references("STEREK",customer,"uplast")
.T.

Products

Recital Database Server, Recital Mirage Server, Recital Terminal Developer