执行匿名PL/SQL块

Question

的问题是要求匿名的PL/SQL块：
         宣布，在计算Products表
         所有产品的变量有一个如果 -

：这取决于计数是否> =或

我尝试到目前为止else语句个

SET SERVEROUTPUT ON; DECLARE number_of_products NUMBER; BEGIN SELECT SUM(product_id) INTO number_of_products FROM products IF number_of_products >= 7 THEN --Syntax error on this line, not sure why DBMS_OUTPUT.PUT_LINE('The number of products is greater than or equal to 7'); ELSE DBMS_OUTPUT.PUT_LINE('The number of products is less than 7'); END IF; EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('An error occurred'); END; 

错误消息：
PL/SQL：ORA-00933：SQL命令未正确结束
ORA-06550：行4，列3：
PL/SQL：SQL语句忽略
ORA -06550：第9行第3列：
PLS-00103：在期待以下某项时遇到符号“ELSE”： （开始case如果循环mod声明结束异常退出 null pragma raise return select update with ORA-06550：第12行，colu MN 1：
PLS-00103：出现符号 “EXCEPTION”
06550. 00000 - “行％S，列％S：\ n％S”

我缺少什么？

Answer 1

SET SERVEROUTPUT ON; 
DECLARE 
    number_of_products NUMBER; 
BEGIN 
    SELECT SUM(product_id) 
    INTO number_of_products 
    FROM products; 
    IF number_of_products >= 7 THEN --Syntax error on this line, not sure why 
    DBMS_OUTPUT.PUT_LINE('The number of products is greater than or equal to 7'); 
    ELSE 
    DBMS_OUTPUT.PUT_LINE('The number of products is less than 7'); 
    END IF; 
EXCEPTION 
    WHEN OTHERS THEN 
    DBMS_OUTPUT.PUT_LINE('An error occurred'); 
END;