JS demo calculate how many days are left in this year

stay MySQL Default engine InnoDB in , Indexes can be roughly divided into two categories ： Clustered index and non clustered index , Their differences are also common interview questions , So let's dish them today .

Cluster index （Clustered Index） Generally refers to the primary key index （ If there is a primary key index ）, A clustered index is also called a clustered index .

Cluster index is in InnoDB Is used in B+ Trees achieve , For example, we create a student surface , Its construction SQL

above student There is a clustered index in the table （ That's the primary key index ）id, And a non clustered index class_id.

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