JOIN 和 INNER JOIN 的区别
这两种连接都会给我相同的结果:
Both these joins will give me the same results:
SELECT * FROM table JOIN otherTable ON table.ID = otherTable.FK
对比
SELECT * FROM table INNER JOIN otherTable ON table.ID = otherTable.FK
在性能或其他方面的陈述之间有什么区别吗?
Is there any difference between the statements in performance or otherwise?
它在不同的 SQL 实现之间是否有所不同?
Does it differ between different SQL implementations?
推荐答案
它们在功能上是等效的,但是 INNER JOIN
可以更清晰地阅读,特别是如果查询具有其他连接类型(即LEFT
或 RIGHT
或 CROSS
) 包含在其中.
They are functionally equivalent, but INNER JOIN
can be a bit clearer to read, especially if the query has other join types (i.e. LEFT
or RIGHT
or CROSS
) included in it.
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