Commonly used basic operation syntax of mysql (2)~~Add, delete and modify operations on tables [command line mode]

1. Modify the table name: alert table oldtablename rename newtablename; or alert table oldtablename rename to newtablename;

[graphical interface If you use it too much, alter will always be typed into alert]

2. Add a field column at the end of the table: alter table tablename add attribute name attribute type;

3. Add fields in the first column of the table: alter table tablename add attribute name attribute type first;

4. Specify fields in the table Add fields later: alter table tablename add attribute name attribute type after attribute name;

##5. Delete fields: alter table tablename drop attribute name;

6. Modify the data type of the field: alter table tablename modify attribute name new data type;

7. Modify the field name: alter table tablename change old attribute name new attribute name old data type;

Note: If the data type is not the old one but replaced with a new data type, the field name and data type will be changed at the same time.

8. Modify the position of the field: alter table tablename modify attribute name 1 data type first or after attribute name 2;

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