oracle 使用 ALTER 操作列

使用 ALTER TABLE 语句追加, 修改, 或删除列的语法

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" alt="" />

 SQL> desc testtable;
 Name     Type         Nullable Default Comments
 -------- ------------ -------- ------- --------
 EMPNO    NUMBER(4)    Y
 ENAME    VARCHAR2(10) Y
 JOB      VARCHAR2(9)  Y
 MGR      NUMBER(4)    Y
 HIREDATE DATE         Y
 SAL      NUMBER(7,2)  Y
 COMM     NUMBER(7,2)  Y
 DEPTNO   NUMBER(2)    Y                         

 SQL>--增加列
 SQL> alter table testtable
   2  add photo blob
   3  ;
 Table altered

 SQL> desc testtable;
 Name     Type         Nullable Default Comments
 -------- ------------ -------- ------- --------
 EMPNO    NUMBER(4)    Y
 ENAME    VARCHAR2(10) Y
 JOB      VARCHAR2(9)  Y
 MGR      NUMBER(4)    Y
 HIREDATE DATE         Y
 SAL      NUMBER(7,2)  Y
 COMM     NUMBER(7,2)  Y
 DEPTNO   NUMBER(2)    Y
 PHOTO    BLOB         Y                         

 SQL>--修改列类型
 SQL> alter table testtable
   2  modify deptno number(3);
 Table altered

 SQL> desc testtable;
 Name     Type         Nullable Default Comments
 -------- ------------ -------- ------- --------
 EMPNO    NUMBER(4)    Y
 ENAME    VARCHAR2(10) Y
 JOB      VARCHAR2(9)  Y
 MGR      NUMBER(4)    Y
 HIREDATE DATE         Y
 SAL      NUMBER(7,2)  Y
 COMM     NUMBER(7,2)  Y
 DEPTNO   NUMBER(3)    Y
 PHOTO    BLOB         Y                         

 SQL>--删除列
 SQL> alter table testtable
   2  drop column photo;
 Table altered

 SQL> desc testtable;
 Name     Type         Nullable Default Comments
 -------- ------------ -------- ------- --------
 EMPNO    NUMBER(4)    Y
 ENAME    VARCHAR2(10) Y
 JOB      VARCHAR2(9)  Y
 MGR      NUMBER(4)    Y
 HIREDATE DATE         Y
 SAL      NUMBER(7,2)  Y
 COMM     NUMBER(7,2)  Y
 DEPTNO   NUMBER(3)    Y                         

 SQL>--修改列名
 SQL> alter table testtable
   2  rename column
   3  deptno to dno;
 Table altered

 SQL> desc testtable;
 Name     Type         Nullable Default Comments
 -------- ------------ -------- ------- --------
 EMPNO    NUMBER(4)    Y
 ENAME    VARCHAR2(10) Y
 JOB      VARCHAR2(9)  Y
 MGR      NUMBER(4)    Y
 HIREDATE DATE         Y
 SAL      NUMBER(7,2)  Y
 COMM     NUMBER(7,2)  Y
 DNO      NUMBER(3)    Y