Difference between revisions of "UNIQUE()"
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==Purpose== | ==Purpose== | ||
Function to test for unique indexes | Function to test for unique indexes | ||
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==Syntax== | ==Syntax== | ||
UNIQUE(<expN>) | UNIQUE(<expN>) | ||
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==See Also== | ==See Also== | ||
[[INDEX]], [[INDEXKEY()]], [[INDEXORDER()]], [[KEY()]], [[SET UNIQUE]] | [[INDEX]], [[INDEXKEY()]], [[INDEXORDER()]], [[KEY()]], [[SET UNIQUE]] | ||
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==Description== | ==Description== | ||
The UNIQUE() function returns .T. if the specified index <expN> is unique, and .F. if it is not unique. <expN> is the index number from 0 to 20. If zero is specified then UNIQUE() tests the master index. For tagged multiple indexes, only the master index can be tested. | The UNIQUE() function returns .T. if the specified index <expN> is unique, and .F. if it is not unique. <expN> is the index number from 0 to 20. If zero is specified then UNIQUE() tests the master index. For tagged multiple indexes, only the master index can be tested. | ||
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==Example== | ==Example== | ||
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.T. | .T. | ||
</code> | </code> | ||
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==Products== | ==Products== | ||
Revision as of 11:23, 12 December 2012
Purpose
Function to test for unique indexes
Syntax
UNIQUE(<expN>)
See Also
INDEX, INDEXKEY(), INDEXORDER(), KEY(), SET UNIQUE
Description
The UNIQUE() function returns .T. if the specified index <expN> is unique, and .F. if it is not unique. <expN> is the index number from 0 to 20. If zero is specified then UNIQUE() tests the master index. For tagged multiple indexes, only the master index can be tested.
Example
use accounts index on name to name unique ? unique(0) .T.
Products
Lianja, Lianja Server
