JOIN 和 INNER JOIN 的区别

Difference between JOIN and INNER JOIN(JOIN 和 INNER JOIN 的区别)

问题描述

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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