sql 语句解决不了
参考:
SQL > select job,ename from emp;
JOB ENAME
--------- ----------
CLERK SMITH
SALESMAN ALLEN
SALESMAN WARD
MANAGER JONES
SALESMAN MARTIN
MANAGER BLAKE
MANAGER CLARK
ANALYST SCOTT
PRESIDENT KING
SALESMAN TURNER
CLERK ADAMS
JOB ENAME
--------- ----------
CLERK JAMES
ANALYST FORD
CLERK MILLER
已选择14行。
SQL > create or replace function f_ename(jobno in varchar2)
2 return varchar2 is
3
4 str_return varchar2(200);
5 cursor c_ename(v_jobno varchar2) is select ename from emp where job=v_jobno;
6 begin
7 for str_temp in c_ename(jobno) loop
8 str_return:=str_return | |str_temp.ename;
9 end loop;
10 return str_return;
11 end;
12 /
函数已创建。
SQL > select f_ename(job) from (
2 select distinct job from emp);
F_ENAME(JOB)
---------------------------------------
SCOTT FORD
SMITH ADAMS JAMES MILLER
JONES BLAKE CLARK
KING
ALLEN WARD MARTIN TURNER
SQL >
加上job列:
SQL > select job,f_ename(job) from (
2 select distinct job from emp);
JOB F_ENAME(JOB)
-------------------------------------------------------
ANALYST SCOTT FORD
CLERK SMITH ADAMS JAMES MILLER
MANAGER JONES BLAKE CLARK
PRESIDENT KING
SALESMAN ALLEN WARD MARTIN TURNER
参考:
SQL > select job,ename from emp;
JOB ENAME
--------- ----------
CLERK SMITH
SALESMAN ALLEN
SALESMAN WARD
MANAGER JONES
SALESMAN MARTIN
MANAGER BLAKE
MANAGER CLARK
ANALYST SCOTT
PRESIDENT KING
SALESMAN TURNER
CLERK ADAMS
JOB ENAME
--------- ----------
CLERK JAMES
ANALYST FORD
CLERK MILLER
已选择14行。
SQL > create or replace function f_ename(jobno in varchar2)
2 return varchar2 is
3
4 str_return varchar2(200);
5 cursor c_ename(v_jobno varchar2) is select ename from emp where job=v_jobno;
6 begin
7 for str_temp in c_ename(jobno) loop
8 str_return:=str_return | |str_temp.ename;
9 end loop;
10 return str_return;
11 end;
12 /
函数已创建。
SQL > select f_ename(job) from (
2 select distinct job from emp);
F_ENAME(JOB)
---------------------------------------
SCOTT FORD
SMITH ADAMS JAMES MILLER
JONES BLAKE CLARK
KING
ALLEN WARD MARTIN TURNER
SQL >
加上job列:
SQL > select job,f_ename(job) from (
2 select distinct job from emp);
JOB F_ENAME(JOB)
-------------------------------------------------------
ANALYST SCOTT FORD
CLERK SMITH ADAMS JAMES MILLER
MANAGER JONES BLAKE CLARK
PRESIDENT KING
SALESMAN ALLEN WARD MARTIN TURNER
SQL> select * from lindong; ID NAME
---------- ----
1 a
1 b
2 aa
2 bb
2 abc
SQL> create or replace function mypro(id in number)
2 return varchar2 is ll varchar2(20);
3 cursor mycursor(v_id number) is select name from lindong
4 where id=v_id;
5 begin
6 for str_temp in mycursor(id) loop
7 ll:=ll||str_temp.name;
8 end loop;
9 return ll;
10 end;
11 /函数已创建。SQL> select mypro(id) from (select distinct id from lindong);
MYPRO(ID)
----------------------------------------------------------------ab
aabbabcSQL> select id,mypro(id) from (select distinct id from lindong); ID
----------
MYPRO(ID)
--------------------------------------------------------------- 1
ab 2
aabbabc