SQL Escape ' '

Question

I am trying to run a query in SQL 2008 by doing:

@query varchar(max)

SET @query = \'SELECT * FROM Table WHERE [Name] = \' \'Karl\' \' \'

EXEC(@query)


        

Answer 1

A double single ('') quote will act like a single single quote when inside a string literal.

Have you tried using a variable?

declare @karl_name varchar(10);
set @karl_name = '''Karl''';

SELECT * FROM Table WHERE [Name] = @karl_name

Answer 2

Simply escape the apostrophes by using the escaping bar \ like this 'SELECT * FROM Table WHERE [Name] = ' \'Karl\' ' '

Hope it helps

Answer 3

This works on my machine from SQL Server Management Studio:

@query varchar(max)

SET @query = 'SELECT * FROM Table WHERE [Name] = ''''''Karl'''''''

EXEC(@query)

Answer 4

This works:

create table #demo([Name] varchar(max))
insert into #demo([Name]) values('''Karl''')
insert into #demo([Name]) values('Karl')
declare @query varchar(max)
set @query = 'SELECT * FROM #demo WHERE [Name] = ''''''Karl'''''''
EXEC(@query)

Output:

'Karl'

But if 'Karl' is variable text, it's highly recommended to use something like this instead:

declare @query nvarchar(max)
declare @param varchar(max)
set @param = N'''Karl'''
set @query = N'SELECT * FROM #demo WHERE [Name] = @param'
exec sp_executesql @query, N'@param varchar(max)', @param

Answer 5

Try:

DECLARE @query varchar(max)

SET @query = 'SELECT * FROM Table WHERE [Name] = ''Karl'''

PRINT 'when in doubt, print the query out: '+ISNULL(@query,'')
EXEC(@query)

To have a single quote appear, you need to have two adjacent single quotes. You escape a single quote with a single quote, for example:

PRINT ''''     --will print a one single quote
PRINT ''''''   --will print two single quotes
PRINT 'can''t' --will print can't

Answer 6

do like this SET @query = 'SELECT * FROM Table WHERE [Name] = ''''Karl'''''