Difference between revisions of "KEYLOOKUP()"

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(Created page with "==Purpose== Function to perform a cross-table lookup ==Syntax== KEYLOOKUP(<workarea | alias>, <"tagname">, <key expression>, <valueExpr>) ==See Also== LOOKUP(), [[RLOOKU...")
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Revision as of 11:08, 7 December 2012

Purpose

Function to perform a cross-table lookup

Syntax

KEYLOOKUP(<workarea | alias>, <"tagname">, <key expression>, <valueExpr>)

See Also

LOOKUP(), RLOOKUP(), SEEK(), SET RELATION

Description

The KEYLOOKUP() function looks up the specified index <key expression> in the index <tagname> of the specified <workarea | alias>. The KEYLOOKUP() function then evaluates the expression <valueExpr>, and returns the value of the <valueExpr> if the <key expression> is found. The KEYLOOKUP() function returns a null string if the <key expression> is not found.

Example

open database southwind
use employees in 0
use order in 0
? keylookup(employees,"employeeid",orders.employeeid, employees.lastname)