MySQL在指定列之前或之后插入列

To add a column called email to the contacts table created in Create a basic MySQL table with a datatype of VARCHAR(80), use the following SQL statement:

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1. ALTER TABLE contacts ADD email VARCHAR(60);  

ALTER TABLE contacts ADD email VARCHAR(60);

This first statement will add the email column to the end of the table. To insert the new column after a specific column, such as name, use this statement:

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1. ALTER TABLE contacts ADD email VARCHAR(60) AFTER name;  

ALTER TABLE contacts ADD email VARCHAR(60) AFTER name;

If you want the new column to be first, use this statement:

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print ?

1. ALTER TABLE contacts ADD email VARCHAR(60) FIRST;  

ALTER TABLE contacts ADD email VARCHAR(60) FIRST;