語法

ALTER TABLE <tablename> 
ADD <columnname> <column attributes> 
DROP <columnname>;

例子

以下示例刪除列DOB并添加新列BirthDate。

ALTER TABLE employee 
ADD BirthDate DATE FORMAT 'YYYY-MM-DD', 
DROP DOB;

您可以運行SHOW TABLE命令查看對表的更改。 在以下輸出中，您可以看到刪除列employee_dob并添加BirthDate。

SHOW table employee;
*** Text of DDL statement returned.
*** Total elapsed time was 1 second.
---------------------
CREATE SET TABLE Employee ,FALLBACK, 
   NO BEFORE JOURNAL, 
   NO AFTER JOURNAL, 
   CHECKSUM = DEFAULT, 
   
   DEFAULT MERGEBLOCKRATIO ( 
      EmployeeNo INTEGER, 
      FirstName VARCHAR(30) CHARACTER SET LATIN NOT CASESPECIFIC, 
      LastName VARCHAR(30) CHARACTER SET LATIN NOT CASESPECIFIC, 
      JoinedDate DATE FORMAT 'YYYY-MM-DD', 
      DepartmentNo BYTEINT,
      BirthDate DATE FORMAT 'YYYY-MM-DD'
   ) 
UNIQUE PRIMARY INDEX ( EmployeeNo );