如何分配一個匿名變量到plsql中的列？

Question

我想分配一個輸入變量到pl/sql中。

我想通過讓用戶輸入department_id並輸出名字，姓氏和薪水來查詢數據庫。表中的工資是第二高的工資。

declare 
v_dept_id int; 

Begin 
Select emp1.first_name, emp1.last_name, emp1.salary, emp1.department_id 
From employees emp1 
Where (1) = 
(select count(distinct(emp1.salary)) 
    From employees emp2 
     Where emp2.salary > emp1.salary) ; 
End; 

澄清 編輯：我編輯的代碼以包括V_dept_id但是它並不運行 聲明
v_dept_id INT;

Begin 
Select emp1.first_name, emp1.last_name, emp1.salary, emp1.department_id 
into v_dept_id 
From employees emp1 
Where ((1) = 
(select count(distinct(emp1.salary)) 
    From employees emp2 
     Where emp2.salary > emp1.salary)) and v_dept_id = '&Enter_dept_id' ; 
End; 

錯誤：

Error starting at line : 4 in command - 
declare 
v_dept_id int; 

Begin 
Select emp1.first_name, emp1.last_name, emp1.salary, emp1.department_id 
into v_dept_id 
From employees emp1 
Where ((1) = 
(select count(distinct(emp1.salary)) 
    From employees emp2 
     Where emp2.salary > emp1.salary)) and v_dept_id = '&Enter_dept_id' ; 
End; 
Error report - 
ORA-06550: line 6, column 16: 
PL/SQL: ORA-00947: not enough values 
ORA-06550: line 5, column 1: 
PL/SQL: SQL Statement ignored 
06550. 00000 - "line %s, column %s:\n%s" 
*Cause: Usually a PL/SQL compilation error. 
*Action: 

EDIT2基於以下反饋的答案與錯誤 我不知道如何讓輸入一個數字正確

declare 
v_dept_id number; 
v_fname varchar(50); 
v_lname varchar(50); 
v_salary NUMBER(8,2); 

Begin 
Select emp1.department_id, emp1.first_name, emp1.last_name, emp1.salary 
into v_dept_id, v_fname, v_lname, v_salary 
From employees emp1 
Where ((1) = 
(select count(distinct(emp1.salary)) 
    From employees emp2 
     Where emp2.salary > emp1.salary)) and v_dept_id = '&Enter_dept_id' ; 
End; 

提示

Error starting at line : 1 in command - 
declare 
v_dept_id number; 
v_fname varchar(50); 
v_lname varchar(50); 
v_salary NUMBER(8,2); 

Begin 
Select emp1.department_id, emp1.first_name, emp1.last_name, emp1.salary 
into v_dept_id, v_fname, v_lname, v_salary 
From employees emp1 
Where ((1) = 
(select count(distinct(emp1.salary)) 
    From employees emp2 
     Where emp2.salary > emp1.salary)) and v_dept_id = '&Enter_dept_id' ; 
End; 
Error report - 
ORA-01403: no data found 
ORA-06512: at line 8 
01403. 00000 - "no data found" 
*Cause: No data was found from the objects. 
*Action: There was no data from the objects which may be due to end of fetch. 

Answer 1

Raj_Te解釋爲什麼你的代碼不能編譯。但我不太喜歡你的方法來檢索第二高的薪水。我猜你的方法可行，但不清楚該代碼段試圖達到什麼目的。

在下面的代碼中，DENSE_RANK函數將返回每一行的工資排名。具有相同的薪水任何行會得到同樣的排名：

SELECT 
emp.first_name 
,emp.last_name 
,emp.salary 
,emp.department_id 
FROM 
(SELECT 
    emp1.first_name 
    ,emp1.last_name 
    ,emp1.salary 
    ,emp1.department_id 
    ,DENSE_RANK() OVER (PARTITION BY emp1.department_id ORDER BY emp1.salary DESC) dr 
    FROM 
    employees  emp1 
    WHERE emp1.department_id = &dept_id 
) emp 
WHERE 1=1 
AND emp.dr = 2 
; 

通過聲明emp.dr = 2，我們說，我們要在工資排名第二高的所有行。

Answer 2

您在單個變量中選擇4個字段。這就是爲什麼它沒有足夠的價值。您必須decalre 4個變量或創建4列記錄，然後捕獲值。

Select emp1.first_name, emp1.last_name, emp1.salary, emp1.department_id 
into v_dept_id <--- trying to fetch 4 columns values to a single varibale. 

可以decalre相同的數據類型的新變量作爲您的選擇，並做到這一點：

Select emp1.first_name, emp1.last_name, emp1.salary, emp1.department_id 
into v_emp_first_nm,v_emp_last_nm ,v_emp_sal,v_dept_id