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PostgreSQL documentation
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</synopsis>
is equivalent to
<synopsis>
-<replaceable>a</replaceable> >= <replaceable>x</replaceable> AND <replaceable>a</replaceable>able> <= <replaceable>y</replaceable>
+<replaceable>a</replaceable> >= <replaceable>x</replaceable> AND <replaceable>a</replaceable> <= <replaceable>y</replaceable>
</synopsis>
Similarly,
<synopsis>
</synopsis>
is equivalent to
<synopsis>
-<replaceable>a</replaceable> < <replaceable>x</replaceable> OR <replaceable>a</replaceable>able> > <replaceable>y</replaceable>
+<replaceable>a</replaceable> < <replaceable>x</replaceable> OR <replaceable>a</replaceable> > <replaceable>y</replaceable>
</synopsis>
There is no difference between the two respective forms apart from
the <acronym>CPU</acronym> cycles required to rewrite the first one