为什么忽略 SQL Server 2014 中的空格文本

Question

When I compared text like this:

'a' = 'a '

the result is True - but I was expecting it to be false.

Do you know why the result is true? And can I do something to solve this issue?

Answer 1

You can use DATALENGTH()

Example

SELECT * FROM TableName WHERE DATALENGT('a') = DATALENGTH('a ')

DATALENGT('a') return the result as 1
and DATALENGTH('a ') return the result as 2, includes the space text.

Please check the db<>fiddle for reference.

Answer 2

The LIKE operator does not pad the trailing spaces:

SELECT * FROM basePath WHERE 'a' LIKE 'a '

More information can be found here: https://dba.stackexchange.com/questions/56876/sql-server-auto-trim-of-varchar-value-in-equal-comparison-but-not-like-compariso