我什么时候对postgres sql使用嵌套查询?
是什么区别..
select a.value1
from apple a, banana b, oranges o
where a.value1 = b.value1 and o.value1 = a.value1 and o.value2 = 'oranges';
compared to
select a.value1
from apple a
where a.value1 in (
select b.value1
from banana b, oranges o
where b.value1 = o.value1 and o.value2 = 'oranges';
);
真的有区别吗?
没有找到相关结果
已邀请:
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