步驟一：創建測試表

CREATE TABLE EMP

(

EMPNO NUMBER(4),

ENAME VARCHAR2(10),

JOB VARCHAR2(9),

MGR NUMBER(4),

HIREDATE DATE,

SAL NUMBER(7,2),

COMM NUMBER(7,

DEPTNO NUMBER(2)

);

步驟二：插入測試數據

INSERT INTO EMP VALUES

(7369,'SMITH','CLERK',7902,to_date('17-12-1980','dd-mm-yyyy'),800,NULL,20);

INSERT INTO EMP VALUES

(7499,'ALLEN','SALESMAN',7698,to_date('20-2-1981',1600,300,30);

INSERT INTO EMP VALUES

(7521,'WARD',to_date('22-2-1981',1250,500,30);

INSERT INTO EMP VALUES

(7566,'JONES','MANAGER',7839,to_date('2-4-1981',2975,20);

INSERT INTO EMP VALUES

(7654,'MARTIN',to_date('28-9-1981',1400,30);

INSERT INTO EMP VALUES

(7698,'BLAKE',to_date('1-5-1981',2850,30);

INSERT INTO EMP VALUES

(7782,'CLARK',to_date('9-6-1981',2450,10);

INSERT INTO EMP VALUES

(7788,'SCOTT','ANALYST',7566,to_date('13-7-1987','dd-mm-yyyy')-85,3000,20);

INSERT INTO EMP VALUES

(7839,'KING','PRESIDENT',to_date('17-11-1981',5000,10);

INSERT INTO EMP VALUES

(7844,'TURNER',to_date('8-9-1981',1500,30);

INSERT INTO EMP VALUES

(7876,'ADAMS',7788,to_date('13-7-87','dd-mm-yyyy')-51,1100,20);

INSERT INTO EMP VALUES

(7900,'JAMES',to_date('3-12-1981',950,30);

INSERT INTO EMP VALUES

(7902,'FORD',20);

INSERT INTO EMP VALUES

(7934,'MILLER',7782,to_date('23-1-1982',1300,10);

commit;

步驟三：實現列值轉換為列標題(這里以JOB列進行轉換)

declare

c1 sys_refcursor;

v_job emp.job%type;

v_sql varchar2(1024):='';

begin

v_sql:='select deptno';

open c1 for select distinct job from emp;

loop

fetch c1 into v_job;

exit when c1%notfound;

v_sql:=v_sql||',count(case job when '''||v_job||''' then job else null end) as '||v_job;

end loop;

close c1;

v_sql:=v_sql||' from emp group by deptno';

dbms_output.put_line(v_sql);--這條語句的輸出，就是我們想要的sql語句

end;

/

--輸出語句如下

select deptno,

count(case job when 'CLERK' then job else null end) as CLERK,

count(case job when 'SALESMAN' then job else null end) as SALESMAN,

count(case job when 'PRESIDENT' then job else null end) as PRESIDENT,

count(case job when 'MANAGER' then job else null end) as MANAGER,

count(case job when 'ANALYST' then job else null end) as ANALYST

from emp group by deptno

--對應的執行結果如下：

總結

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