On 03 Dec 2012 10:53, Richard Schoen wrote:
I don't know if I stated it, but my assumption would be to only use
this technique for unique fields.
If I understand correctly... Care must still be taken, as I alluded.
The assumption that the predicate will be used only on a UNIQUE
protected column may be irrelevant, given any failure to ensure the
situation that I had presented will never transpire. That is to
suggest... The example I gave does have unique\distinct values. A LIKE
[or equivalent LOCATE] predicate by itself, can not guarantee just one
matching result amongst those distinct values; instead, either an
equivalence [equal] predicate must be used, or some constraints on the
data would be required to prevent those other predicates from ever
yielding more than one matching row.
