Oracle条件更新查询

Question

我有一个要求如下所示:

假设我们有5行的EMP表,deptno = 20 - 这是我将从输入参数得到deptno ie20

EMPNO   ENAME   JOB       MGR   HIREDATE    SAL     COMM    DEPTNO 
--------------------------------------------------------------------------------
7566    JONES   MANAGER   7839  04/02/1981  2975    -   20 
7788    SCOTT   ANALYST   7566  12/09/1982  3000    -   20 
7902    FORD    ANALYST   7566  12/03/1981  3000    -   20 
7369    SMITH   CLERK     7902  12/17/1980  800     -   20 
7876    ADAMS   CLERK     7788  01/12/1983  1100    -   20 

现在我想在程序中写一个UPDATE查询,它将更新EMP表集JOB ='MANAGER',其中empno in(7788,7902); - 这里是empno ie 7788和7902我将从输入参数得到

我的更新查询应该为deptno = 20的2行更新JOB ='MANAGER',而我要更新的3行的其余部分将为Null值.

所以最终输出如下所示:

EMPNO   ENAME   JOB       MGR   HIREDATE    SAL     COMM    DEPTNO 
--------------------------------------------------------------------------------
7566    JONES             7839  04/02/1981  2975    -   20 
7788    SCOTT   MANAGER   7566  12/09/1982  3000    -   20 
7902    FORD    MANAGER   7566  12/03/1981  3000    -   20 
7369    SMITH             7902  12/17/1980  800     -   20 
7876    ADAMS             7788  01/12/1983  1100    -   20 

那么编写此查询的最佳方法是什么

Answer 1

尝试:

UPDATE emp
   SET job = (CASE empno
                 WHEN 7788
                 THEN 'MANAGER'
                 WHEN 7902
                 THEN 'MANAGER'
                 ELSE NULL
               END)
 WHERE deptno = 20;

要么

UPDATE emp
   SET job = (CASE
                 WHEN empno IN (7788, 7902)
                 THEN 'MANAGER'
                 ELSE NULL
               END)
 WHERE deptno = 20;

希望这就是你追求的......

编辑:在您对来自数字表类型的输入的评论后,这样的事情应该工作:

CREATE TYPE number_tab
AS TABLE OF NUMBER
/

类型已创建.

CREATE OR REPLACE
PROCEDURE upd_emp (
   p_deptno    IN emp.deptno%TYPE,
   p_empno_tab IN number_tab
)
IS
BEGIN
   UPDATE emp e
      SET e.job = (SELECT (CASE 
                             WHEN t.column_value IS NULL
                             THEN NULL
                             ELSE 'MANAGER'
                            END)
                     FROM TABLE(p_empno_tab) t
                    WHERE t.column_value(+) = e.empno)
    WHERE deptno = p_deptno;
EXCEPTION
   WHEN others
   THEN
      ...Exception handling code
END upd_emp;
/