Enable/disable SQL DISTINCT optimization.
The value n
may be 1 or 0:
When 1 (true) SQL queries involving DISTINCT and GROUP BY run more efficiently by making better use of indices (if available).
The values returned by such queries are collated in the same way they are stored within the index. This means the results of such queries may be uppercase. This may have an effect on case-sensitive applications.
When 0 (false) optimization of DISTINCT queries is disabled.
Range of Values
0 or 1. The default is 1.