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Any functions to mimic SOUNDEX?

Is it possible to use another function that gives the same functionality as SOUNDEX for an index?
I don't know of any other that mimics SOUNDEX unless you try to write your own (yikes!). But any function can be used in creating an index. For example: CREATE INDEX my_idx ON mytable(UPPER(column))

Also remember that function-based indexes require query_rewrite_enabled be set to true and query_rewrite_integrity be set to trusted.
QUERY_REWRITE_INTEGRITY = TRUSTED
QUERY_REWRITE_ENABLED = TRUE
COMPATIBLE = 8.1.0.0.0 (or higher)

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