When we use the NULL-safe operator in row comparison, such as (A, B) <=> (C, D), its performance is equivalent to ( A <=> C) AND (B <=> D). The following example will illustrate −
mysql> Select (100,50) <=> (50,100); +-----------------------+ | (100,50) <=> (50,100) | +-----------------------+ | 0 | +-----------------------+ 1 row in set (0.00 sec) mysql> Select (100,50) <=> (100,50); +-----------------------+ | (100,50) <=> (100,50) | +-----------------------+ | 1 | +-----------------------+ 1 row in set (0.00 sec)
The above result set shows how to use the NULL safe operator for row comparison.
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