Question

The SQL is:

execute ('delete from HttpRequests where Date < ''2009-08-' + convert(nvarchar(max), 0) + '''')

The error is

Msg 156, Level 15, State 1, Line 1
Incorrect syntax near the keyword 'convert'.

Commenting out the convert part removes the error. Whats wrong?

Answer 1

EXECUTE (@stringvariable) does not allow concatenation more complex than @stringvariable1 + @stringvariable2

You’d have to do this:

DECLARE @sql nvarchar(4000)
SELECT @sql = 'delete from HttpRequests where Date < ''2009-08-' + convert(nvarchar(4000), 0) + '''
EXECUTE (@sql)

However, then you have the invalid date error… and I’ve fixed the quote error too…