Question

我是SQL的新手，我在家庭作业上有这个问题：＆＃34;列出ID低于100的客户代表的ID以及每个代表在邮政编码中服务的客户总数9或0（合并）＆＃34;

到目前为止我有这段代码：

SELECT cust_rep, count(cust_nbr) as "CustomerCount"
FROM customer
WHERE cust_rep < 100
GROUP BY cust_rep
ORDER BY cust_rep;

但我不知道如何添加邮政编码限制。谢谢你的帮助！

Answer 1

除了makeusre确保邮政编码的第一个字符是0或9

之外，这将执行您的查询正在执行的操作

SELECT cust_rep, count(cust_nbr) as "CustomerCount"
FROM customer
WHERE cust_rep < 100
AND (
    // adding quotes to avoid implicit conversion
    LEFT(ZipCode, 1) = '0'
    OR LEFT(ZipCode, 1) = '9'
)

GROUP BY cust_rep
ORDER BY cust_rep;

Answer 2

试试这个。

SELECT CUST_REP, COUNT(*) as "CustomerCount"
FROM CUSTOMER 
WHERE cust_rep < 100 
   AND (zipCode like '0%' OR zipCode like '9%')
GROUP BY cust_rep
ORDER BY cust_rep;

使用like运算符查询多个字符串

2 个答案: