此句中
SELECT min(a.x-b.x) as shortest
FROM point as a,point as b
WHERE a.x-b.x>0;
等于
SELECT min(a.x-b.x) as shortest
FROM point as a cross join point as b
WHERE a.x-b.x>0;
此句中
SELECT min(a.x-b.x) as shortest
FROM point as a,point as b
WHERE a.x-b.x>0;
等于
SELECT min(a.x-b.x) as shortest
FROM point as a cross join point as b
WHERE a.x-b.x>0;
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cross join其实就是共有的
本文标题：cross join
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