如何删除一个字段

[email protected]>select * from test;        ID        VAL        DDD
---------- ---------- ----------
         1          1          1
         2          2          2
         3          3          3
         4          4          4
         5          5          5
         6          6          6
         7          7          7
         8          8          8
         9          9          9
        10         10         10已选择10行。[email protected]>alter table test drop column ddd;表已更改。[email protected]>select * from test;        ID        VAL
---------- ----------
         1          1
         2          2
         3          3
         4          4
         5          5
         6          6
         7          7
         8          8
         9          9
        10         10已选择10行。