mysql alter modify the name of the table structure to increase the column

Alter alter the name of the table alter the name of the table structure to increase the column

alter table statement
The alter table statement is used to add, modify, or delete columns from an existing table.

sql alter table syntax To add columns to the table, use the following syntax:

alter table table_name
add column_name datatype
To delete a column in a table, use the following syntax:

alter table table_name
drop column column_name
Note: Some database tutorial systems do not allow this way of dropping columns in database tables (drop column column_name).

To change the data type of a column in a table, use the following syntax:

alter table table_name
alter column column_name datatype

Look at the alert detailed syntax

alter_specification:
add [column] create_definition [first | after column_name]
or add index [index_name] (index_col_name, ...)
or add primary key (index_col_name, ...)
or add unique [index_name] (index_col_name, ...)
or alter [column] col_name {set default literal | drop default}
or change [column] old_col_name create_definition
or modify [column] create_definition
or drop [column] col_name
or drop primary key
or drop index index_name
or rename [as] new_tbl_name
or table_options
eg:

Modify the database structure:
Increase the field:

Modify fields:

Delete field:
alter table dbname drop column <field name>

Example operation:

query ok, 0 rows affected (0.01 sec)

Take a look at the examples