sql - double quotes at end of concatenated TSQL string -


in following concatenated tsql string, apparent single quotes separate literal part of string variables, double quotes @ end of string perplexes me since pattern seems n' denote literal pieces. don't see explanation although know there one?

set @ntsql = n'select * sdmembership '     + @backupname     + @backupdate     + n' fiscalyear = '     + cast(@fiscalyear varchar(4))     + n''

it nchar empty string @ end
pretty sure nothing
null show empty string not same null 

select null [dbnull], n'ldkjf' [string], len(n'ldkjf') [len]  select null [dbnull], n'' [empty_string], len(n'') [len]

and clarity don't use term double quote character.
2 single quotes.


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