Difference between revisions of "LOOKUP()"
From Lianjapedia
Yvonne.milne (Talk | contribs) m (1 revision) |
Yvonne.milne (Talk | contribs) |
||
| Line 1: | Line 1: | ||
==Purpose== | ==Purpose== | ||
Function to perform a cross-table lookup | Function to perform a cross-table lookup | ||
| − | |||
==Syntax== | ==Syntax== | ||
LOOKUP(<exp>, <key expression>, <workarea | alias>) | LOOKUP(<exp>, <key expression>, <workarea | alias>) | ||
| − | |||
==See Also== | ==See Also== | ||
| − | + | [[RLOOKUP()]], [[SEEK()]], [[SET RELATION]] | |
| − | + | ||
==Description== | ==Description== | ||
| − | The LOOKUP() function looks up the specified index <key expression> in the master index of specified <workarea | alias>. The LOOKUP() function then evaluates the expression <exp>, and returns the value of the <exp> if the <key expression> is found. The LOOKUP() function returns a null string if the <key expression> is not found. | + | The LOOKUP() function looks up the specified index <key expression> in the master index of specified <workarea | alias>. The LOOKUP() function then evaluates the expression <exp>, and returns the value of the <exp> if the <key expression> is found. The LOOKUP() function returns a null string if the <key expression> is not found. |
| − | + | ||
==Example== | ==Example== | ||
| Line 23: | Line 19: | ||
</code> | </code> | ||
| − | |||
| − | |||
| − | |||
[[Category:Documentation]] | [[Category:Documentation]] | ||
[[Category:Functions]] | [[Category:Functions]] | ||
Revision as of 10:29, 9 February 2012
Contents
Purpose
Function to perform a cross-table lookup
Syntax
LOOKUP(<exp>, <key expression>, <workarea | alias>)
See Also
RLOOKUP(), SEEK(), SET RELATION
Description
The LOOKUP() function looks up the specified index <key expression> in the master index of specified <workarea | alias>. The LOOKUP() function then evaluates the expression <exp>, and returns the value of the <exp> if the <key expression> is found. The LOOKUP() function returns a null string if the <key expression> is not found.
Example
use depts in 2 index dnum use funcs in 1 index funcno ? lookup(depts->dname,funcs->dnum,depts) Research and Development
