This must have been so obvious to everyone else that nobody bothered to write an article on it... till now.

Situation
I have a report that returns room bookings based on a user and given a date range. The problem is that there are a few thousand users and Microsoft's SQL Server Reporting Services interface isn't the most fun to scroll endlessly down. Advanced users can type the name really fast for it to auto-scroll down to the desired name. Our advanced users are exceptions to the rule.

Problem
Consider the following query:

SELECT
     rb.[GivenDate]
     , rb.[DateStart]
     , rb.[DateFinish]
     , rb.[ContactUsername]
     , rb.[ContactName]
     , rb.[Room]
     , rb.[BookingNotes]
FROM
     roombookings rb
WHERE
    rb.[GivenDate] BETWEEN @GivenDate AND @ToDate
AND
    rb.[ContactName] LIKE '%@GivenName%'   -- WARNING: 0 matching rows
This returns nothing. Took me a while to figure why but it's the parameter that's the issue. You don't enclose it with apostrophes for one thing. So let me rewrite this:
SELECT
     rb.[GivenDate]
     , rb.[DateStart]
     , rb.[DateFinish]
     , rb.[ContactUsername]
     , rb.[ContactName]
     , rb.[Room]
     , rb.[BookingNotes]
FROM
     roombookings rb
WHERE
    rb.[GivenDate] BETWEEN @GivenDate AND @ToDate
AND
    rb.[ContactName] LIKE '%'+@GivenName+'%'  --WORKS! Enclose percent signs as strings.
For anyone that thinks there exists stupid questions, here's a silly answer which I hope helps!

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0 Rudolf Wednesday, 11th November 2015, 3:24 pm
Does this also work with blank or null values?
+1 Trish M Thursday, 12th September 2013, 8:17 pm
Excellent tip. Thanks!