MySQL uses SQL statements to modify field length and field name

mysql Use sql Statement to modify the length or name of a field

1. Modify the length of the field ：

ALTER TABLE  Table name  MODIFY COLUMN  Field name   data type （ Modified length ）

for example ：
Change the length of the name field of the student table from 5 Modify to 10

ALTER TABLE student MODIFY COLUMN name VARCHAR(10)

2. Change the name of the field ：

ALTER TABLE  Table name  CHANGE  Field name   New field name   data type ( Data length )

for example ：
Put the... Of the student table name It is amended as follows student_name

ALTER TABLE student CHANGE name student_name VARCHAR(10)