Sentence arrangement that must be learned by beginners of mysql

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MySQL add columns, modify columns, delete columns ALTER TABLE: add, modify, delete table columns, constraints and other table definitions.

View column: desc table name

Modify the table name: alter table old _ name rename to new_name

Add column: alter table table name add column column name varchar

Delete column: alter table table name drop column column name

Modify column name: alter table table name change old_name new_name character type

Modify column properties: alter table table name modify column name varchar (10)

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