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        JOIN 和 INNER JOIN 的区别

        时间:2023-07-18
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                  本文介绍了JOIN 和 INNER JOIN 的区别的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  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LEFTRIGHTCROSS) 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.

                  这篇关于JOIN 和 INNER JOIN 的区别的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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