PL/SQL第二课（作业)

作业讲解

1.1、查询语句

SELECT b.first_name

FROM s_emp a,s_emp b

WHERE a.manager_id = b.id--manager_id作为外键，与 b 表里的id 连接

AND a.id = 5;

1.2、存储过程

CREATE OR REPLACE PROCKDURE proc_GetManager(

p_id IN s_emp.id%TYPE,

p_name OUT s_emp.first_name%TYPE

)

BEGIN

/*

SELECT first_name

FROM s_emp

WHERE manager_id = NULL;*/

SELECT b.first_name

INTO p_name

FROM s_emp a, s_emp b

WHERE a.manager_id = b.id

AND a.id = p_id;

END

1.3、调用传递

DECLARE

v_first_name s_emp.first_name%TYPE;

BEGIN

proc_GetManager(3,v_fisrt_name);

DBMS_OUTPUT.PUT_LINE('v_fisrt_name = '||v_first_name)

END

2.1、

SELECT a.id, a.first_name, a.salary

FROM s_emp a, s_dept b

WHERE a.dept_id = b.id

AND b.region_id = 2;

2.2、

CREATE OR REPLACE FUNCTION fun_getDept(

p_rid s_region.id%TYPE

RETURN s_dept.name%TYPE)

AS

v_dept s_dept.name%TYPE

CURSOR cur_emp IS

SELECT name

from s_emp a, s_dept b

where a. dept_id = b.id

and b.region_id = p_ id

ORDERby salary DESC;

BEGIN

OPEN cur_emp;

FETCH cur_emp INTO fun_getDept();

CLOSE cur_emp;

END

2.3

DECLARE

v_dept s_dept.name%TYPE;

begin

v_dept := fun_getDept(2);

DBMS_OUTPUT.PUT_LINE(v_dept);

end