Question

这是我的代码，我该如何制作它所以它只显示名字的第一个首字母？

    SELECT *
    FROM HR.Employees E
    WHERE LEFT(E.firstname,1) BETWEEN 'R' AND 'Z'
    ORDER BY E.lastname, E.firstname

Answer 1

正如评论中所说，你的谓词是错误的。我用一些垃圾数据构建了一个临时表，下面的查询按你的意愿工作。

create table #employees  (
    firstname varchar(20),
    lastname varchar(20))

insert into #employees (firstname, lastname) values ('tom', 'jones')
insert into #employees (firstname, lastname) values ('jane', 'smith')
insert into #employees (firstname, lastname) values ('bob', 'roberts')
insert into #employees (firstname, lastname) values ('jon', 'doe')

SELECT
    firstname_firstinitial = LEFT(LTRIM(firstname), 1),
    lastname
FROM #employees E
WHERE LEFT(LTRIM(lastname),1) BETWEEN 'R' AND 'Z' -- change this to lastname
ORDER BY E.lastname, E.firstname

Answer 2

使用left function返回第一个字符，就像在where子句中一样。

SELECT LEFT(E.firstname, 1)
FROM HR.Employees E
WHERE LEFT(E.firstname, 1) BETWEEN 'R' AND 'Z'
ORDER BY E.lastname, E.firstname

什么是在R-Z之间显示姓氏的SQL查询，它只能显示第一个名字的第一个首字母

2 个答案: