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| - | ====== Omnidex SQL Function: $SOUNDEX ====== | ||
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| - | ===== Description ===== | ||
| - | Returns the Soundex equivalent to a character string ("string" may be a CHARACTER or C STRING column, or a string literal). The algorithm used by this function is identical to that applied to keywords in MDK index using the ;SX option. The routine only pays attention to the first 24 characters of the input; the return value is C STRING length 25. | ||
| - | Note that the $SOUNDEX function does not parse fields, and therefore returns the Soundex equivalent of the entire string. For example, the Soundex equivalent of "Dynamic Information Systems Corporation" is "DNMKNFRMTNSSTMSKRP". | ||
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| - | Also note that when processing a predicate of "column = $SOUNDEX("string"), if "column" can be satisfied with an MDK index using the ;SX option, then the query will do so, even though the $SOUNDEX function is not applied to the left operand, and keywording may be involved. If an MDK index using the ;SX option cannot be used, then either the column must contain the Soundex equivalent, or the $SOUNDEX function must be used on the left operand as well. | ||
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| - | For more information on Soundex searches, also known as Phonetic searches, see Omnidex Text and Phonetic Searches. | ||
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| - | ===== Syntax ===== | ||
| - | ===== Example ===== | ||
| - | ==== Example 1 ==== | ||
| - | <code SQL> | ||
| - | > select $soundex('williams') from $omnidex | ||
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| - | $SOU | ||
| - | ---- | ||
| - | WLMS | ||
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| - | </code> | ||
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