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请问 mysql explain 中的 eq_ref 和 const 有什么区别呢?
cc959798
·
Oct 16, 2018
· 5751 views
This topic created in 2939 days ago, the information mentioned may be changed or developed.
查了很多资料都说是使用主键和唯一索引,但是有区别吗
主键
MySQL
const
explain
2 replies
•
2018-10-17 10:09:25 +08:00
liuhuanting
Oct 17, 2018
1
https://dev.mysql.com/doc/refman/8.0/en/explain-output.html#jointype_const
https://dev.mysql.com/doc/refman/8.0/en/explain-output.html#jointype_eq_ref
cc959798
OP
Oct 17, 2018
2
@
liuhuanting
大佬说实话,英文太渣了我看过的没怎么看懂
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