MySQL-DDL-table structure-query&modify&delete

DDL (table operations)

• Inquire

  • Query all tables in the current database: show tables
    • 
  • Query table structure: desc + table name

     

    • 
  • Query table creation statement: show create table + table name
    • 

• Modify (mainly operated through the graphical interface)

• Add field: alter table table name add field name type (length) [ comment comment ] [constraint] 
• Modify the field type: alter table table name modify field name new data type (length)
• Modify the field name and field type: alter table table name change old field name type (length) [ comment comment ] [constraint]
• Delete field: alter table table name drop column field name
• Modify the table name: rename table table name to new table name

• delete

• Delete table: drop table [ if exists ] table name
  • 
  • When deleting a table, all statements in the table will be deleted