使用Postgres函數的語法問題

Question

我在使用我的postgresql函數調試某些語法問題時遇到了問題。這個錯誤並不表示問題出現，我對Postgres來說太新了，不知道哪裏出了問題。我正在使用SQLFiddle進行測試。 SQLFiddle鏈接http://sqlfiddle.com/#!15/266ef

功能，我使用

CREATE OR REPLACE FUNCTION updateSalary() RETURNS VOID AS 
$BODY$ 
    DECLARE 
    sum INTEGER := 0; 
    dep CURSOR FOR SELECT Dno FROM Department; 
    dep_row Department%ROWTYPE; 
    emp CURSOR(dept_Dno) CURSOR FOR 
    SELECT Dno, Salary FROM Employee WHERE Dno = dept_Dno; 
    emp_row Employee%ROWTYPE; 
BEGIN 
    open dep; 
    LOOP 
    FETCH dep into dep_row; 
     exit when NOT FOUND; 
    open emp(dep_row.Dno); 
    LOOP 
     FETCH emp into emp_row; 
     exit when NOT FOUND; 
     SET sum := sum + emp_row.salary; 
    END LOOP; 
    UPDATE department SET total_sal = sum WHERE department.dno = emp_row.dno; 
    close emp; 
    SET sum := 0; 
    END LOOP; 
    close dep; 
END; 
$BODY$ 
    LANGUAGE plpgsql; 

錯誤我收到

Schema Creation Failed: ERROR: missing data type declaration at or near ")": 

Answer 1

光標參數必須聲明的類型（並刪除第二個字 '光標'）：

... 
emp CURSOR(dept_Dno integer) FOR 
    SELECT Dno, Salary FROM Employee WHERE Dno = dept_Dno; 
... 

沒有關鍵字'set'的賦值：

sum := sum + emp_row.salary;