MySQL basic statement

//  modify SQL Middle table name 
	alter table < The original table name > rename to < The new name of the table >;

//  Add a new field to the table 
	alter table < Table name > add < Add field name > < Field type >

//  Update a field in the table 
	update < Table name > set  < Update field name > = < value >

//  Update a column in a row in the table 
	update < Table name > set < Update field name >=< value > where < Conditions >

//  Delete data in table 
	delete from < Table name > where < Conditions >

//  Modify the name of the table 
	alter table < Table name > rename to < The new name of the table >;

// sql  Find custom sort order 
	select * from < Table name > 
	order by case
		when id = 102 then 1
		when id = 99  then 2
		when id = 100 then 3
		when id = 101 then 4
		else id end asc
//  The final data obtained is in  id (102, 99, 100, 101)  The order