How to remove invisible characters in t-sql?

问题:

I tried

UPDATE TABLENAME SET COLUMNNAME = REPLACE(COLUMNNAME, '\t', '')

But I don't know how to write the TAB in t-sql

回答1:

The ASCII code for tab is 9; you could try

update tablename set columnname = replace(columnname, char(9), '')

回答2:

For TAB and ENTER

SELECT
    -- TRIM
    LTRIM(RTRIM(REPLACE(REPLACE(REPLACE(columnname, CHAR(9), ' '), CHAR(13), ' '), CHAR(10), ' ')))

回答3:

In the beginning of my TSql sProcs, I often put

   Declare @nl Char(2) = char(13) + char(10)
   Declare @tab Char(1) = char(9)
   etc...

Then you can use those declared variables anywhere in the rest of the proc without loss of clarity...

回答4:

You can put a tab character in the string, just press the tab key.

That will work, but it's not very readable.

回答5:

I found the solution:

In T-SQL you do not escape characters, you paste or type them directly into the quotes. It works even for \r\n (carriage return, new line = you press enter)