我需要确定MySQL中<=> operator的SQLite的等价物.
任何的想法？
解决方法:
The IS and IS NOT operators work like = and != except when one or both
of the operands are NULL. In this case, if both operands are NULL,
then the IS operator evaluates to 1 (true) and the IS NOT operator
evaluates to 0 (false)
http://www.sqlite.org/lang_expr.html#isisnot
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