MySQL version
show variables like 'version';
Table Structure
desc student;
Modify table
For example: modify the student table name field, the varchar (10) modified to VARCHAR (20 is)
Modify
alter table student modify name varchar(20);
change
alter table student change name name varchar(20);
Modify the column name
Modify the column name change can only be used to modify
, for example: the name of the column name changed to username
From the above it can be found modify and change can modify the definition of the table, but change it takes to write the column name twice, not very convenient. But the advantage is that change can modify the column name, modify can not