查找区分大小写的记录

Question

我需要从表的一列中获取区分大小写的记录。

即他们是一个列email_address，我必须从中找到相同的电子邮件地址，但它们在不同的情况下。

例如：

email_ address
---------------
abc@gmail.com
hef@gmail.com
ABC@gmail.com
hrf@gmail.com

从上面的例子给出。我需要一个查询来从email_address列中只获取记录abc@gmail.com和ABC@gmail.com 。

Answer 1

我个人不喜欢这种方法，但它似乎是我现在唯一的解决方案，它也适用于混合情况：

select * from test t 
    where   
    email_address in 
    (
    select email_address from test group by email_address having count(email_address)> 1        
    )
    and left(email_address, charindex('@', email_address) -1 ) collate SQL_Latin1_General_CP1_CS_AS
        not in (select left(email_address, charindex('@', email_address) -1 ) from test 
                        where email_address collate SQL_Latin1_General_CP1_CS_AS <> t.email_address )

p / s：你需要用你的实际表名替换“test”

Answer 2

试试这段代码

SELECT  *
FROM    table T 
JOIN    tALBE T2 
ON      T.EMAIL             =   T2.EMAIL
AND  CONVERT(varbinary,T.EMAIL)    <>       CONVERT(varbinary,T2.EMAIL)

Answer 3

假设您的数据库不区分大小写，但您需要查找相同的值，但在不同的情况下，这可能有效 -

WITH CTE AS(
SELECT
email_address 
FROM TEST
GROUP BY email_address
Having count(1) > 1
)
SELECT TEST.email_address 
FROM TEST
INNER JOIN CTE ON
TEST.email_address=CTE.email_address

SQL FIDDLE

Answer 4

使用以下条件

Where [email_ address] COLLATE Latin1_General_100_CI_AI = 'abc@gmail.com'

Answer 5

试试这个，

Select * from TableName where email_ address COLLATE Latin1_General_CS_AS = 'Your I/p Values'

Answer 6

试试这个：

SELECT *
FROM
( VALUES ('abc'), ('ABC'), ('AbC')
) x(name)
WHERE name COLLATE Latin1_General_100_CS_AI = 'abc'

Answer 7

我们可以通过两种方式查找区分大小写的记录1.使用COLLATE Latin1_General_CS_AI 2.使用BINARY_CHECKSUM

create table EmailDetails(EID int identity(1,1),EmailAddress varchar(100))
insert into EmailDetails values('abc@gmail.com')
insert into EmailDetails values('ABC@gmail.com')
select EmailAddress from EmailDetails 
where EmailAddress COLLATE Latin1_General_CS_AI=LOWER(EmailAddress)
select EmailAddress from EmailDetails 
  where EmailAddress COLLATE Latin1_General_CS_AI='abc@gmail.com'
select EmailAddress from EmailDetails 
where BINARY_CHECKSUM(EmailAddress)=BINARY_CHECKSUM('abc@gmail.com')

Answer 8

这是答案，

declare @t table(email varchar(100))

insert into @t values('abc@gmail.com'),('hef@gmail.com'),('ABC@gmail.com'),('hrf@gmail.com')

declare @searchEmail varchar(100 )= 'ABC@gmail.com'

---1st approach 
SELECT *
FROM @t
WHERE   
    email = @searchEmail COLLATE SQL_Latin1_General_CP1_CS_AS

---2nd approach to convert in binary
select * from @t where CAST(email  as varbinary(100))  =  CAST(@searchEmail as varbinary(100))  

可以通过更改排序规则来完成，默认情况下它不区分大小写。

通过使用排序规则或转换为二进制，如下所示：

检查相同的答案问这里..

如何在WHERE子句中进行区分大小写的搜索（我使用的是SQL Server）？

SQL Server检查区分大小写？

Answer 9

使用通配符sql查询运算符或命令..我不知道它叫什么我忘了..你通过在WHERE变量的左右部分添加“ % ”符号来使用它，如：

SELECT * FROM TABLE WHERE COLUMN = %@VARIABLE% 

希望这可以帮助

Answer 10

只是在SQL中使用“LIKE”:)

SELECT email_address FROM <tablename> WHERE email_address like 'abc@gmail.com'

它会显示忽略大小写的所有电子邮件地址:)

或者你可以使用更多的进步，如开始，结束，包含

SELECT email_address FROM <tablename> WHERE email_address like '%abc%' //contains with
SELECT email_address FROM <tablename> WHERE email_address like 'abc%' //Begin with
SELECT email_address FROM <tablename> WHERE email_address like '%abc' //Ends with