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出现以下错误：ORA-01422：精确提取返回的行数超过了请求的行数 ORA-6512

PL/SQL 的新手，虽然我知道这个查询应该通过标准 SQL 进行，但我试图弄清楚如何使用 PL/SQL 来完成这个。

我需要查询返回邮政编码为“20636”的客户的销售总数

这是表格/输入：

CREATE TABLE CUSTOMERS
(customerID     INT     PRIMARY KEY,
customerZip     VARCHAR(15) NOT NULL); 

CREATE TABLE SALES
(saleID         INT     PRIMARY KEY,
customerID      INT,
CONSTRAINT SALES_FK1 FOREIGN KEY (customerID) REFERENCES CUSTOMERS(customerID));

INSERT INTO CUSTOMERS (customerID, customerZIP) VALUES (1, '20636');
INSERT INTO CUSTOMERS (customerID, customerZIP) VALUES (2, '20619');
INSERT INTO CUSTOMERS (customerID, customerZIP) VALUES (3, '20650');
INSERT INTO CUSTOMERS (customerID, customerZIP) VALUES (4, '20670');
INSERT INTO CUSTOMERS (customerID, customerZIP) VALUES (5, '20636');

INSERT INTO SALES (saleID, customerID) VALUES (1, 1);
INSERT INTO SALES (saleID, customerID) VALUES (2, 2);
INSERT INTO SALES (saleID, customerID) VALUES (3, 3);
INSERT INTO SALES (saleID, customerID) VALUES (4, 4);
INSERT INTO SALES (saleID, customerID) VALUES (5, 5);

这是我为 PL/SQL 匿名块编写的代码：

DECLARE
customerZip INTEGER;
totalSales INTEGER;
BEGIN
SELECT customerID INTO customerZip from CUSTOMERS where customerZip = '20636';
SELECT COUNT(*) INTO totalSales from SALES where customerID = customerZip;
DBMS_OUTPUT.put_line('We sold ' || totalSales || ' Cars to customers in Zip Code ' || customerZip ||'.');
END;
/

如果我在没有将两个 customerZIP 属性设置为“20636”的情况下运行它，它可以正常工作。一旦我输入多个邮政编码为“20636”的客户记录，我就会收到错误消息。

您能否解释一下我在这里做错了什么以及如何解决？谢谢！

SQL Fiddle 链接（如果有帮助）：http ://sqlfiddle.com/#!4/10fc1

4

1 回答 1

2

您可以使用这样的声明：

SQL> set serveroutput on;
SQL> DECLARE
  v_customerZip CUSTOMERS.customerZip%type:='20636';
  v_customerID  CUSTOMERS.customerID%type;
  totalSales    INTEGER:=0;
  Sales         INTEGER;
BEGIN
 for c in ( SELECT customerID from CUSTOMERS where customerZip = v_customerZip )
 loop
  v_customerID := c.customerID;
  SELECT COUNT(1) INTO Sales from SALES where customerID = v_customerID;
  totalSales := totalSales + Sales;
 end loop; 
  dbms_output.put_line('We sold ' || totalSales || ' Cars to customers in Zip Code ' || v_customerZip ||'.');
END;
/
We sold 2 Cars to customers in Zip Code 20636.

并从声明部分更改变量 v_customerZip 的值。

或者您可以创建一个过程来完成此任务：

SQL> CREATE OR REPLACE PROCEDURE GET_SALES( v_customerZip CUSTOMERS.customerZip%type ) IS
  v_customerID  CUSTOMERS.customerID%type;
  totalSales    INTEGER:=0;
  Sales         INTEGER;
BEGIN
 for c in ( SELECT customerID from CUSTOMERS where customerZip = v_customerZip )
 loop
  v_customerID := c.customerID;
  SELECT COUNT(1) INTO Sales from SALES where customerID = v_customerID;
  totalSales := totalSales + Sales;
 end loop; 
  dbms_output.put_line('We sold ' || totalSales || ' Cars to customers in Zip Code ' || v_customerZip ||'.');
END;
/
SQL> exec get_sales('&cZ');
Enter value for cz: 20636
We sold 2 Cars to customers in Zip Code 20636.
于 2018-02-07T19:36:37.167 回答