Question

例如，我有一个带有FirstName和LastName列的Customers表 - 我假设必须连接这两列才能找到最长的客户名称。我该怎么做呢？

Answer 1

这将为您提供DB中最长的名称：

SELECT MAX(LEN(FirstName) + LEN(LastName)) AS MaxLen 
from Customers

Answer 2

这将告诉您每个客户姓名的长度：

SELECT LEN(FirstName) + LEN(LastName) as TotalLength from Customers

Answer 3

SELECT TOP 1 ID, FirstName, LastName, LEN(FirstName + LastName)
FROM Customers
ORDER BY LEN(FirstName + LastName) DESC;

ID是您的主键。这将为您提供最长连接名称的id，名字，姓氏和长度。

Answer 4

SELECT * FROM names by order（length（first_name）+ length（last_name））desc limit 1;

Answer 5

SELECT firstName, lastName 
FROM Customers t1
INNER JOIN (SELECT MAX(Len(firstName) + Len(lastName)) longest FROM Customers) t2
ON Len(t1.firstName) + Len(t1.lastName) = longest

找到两列合并的最大长度

5 个答案: