intervalmatch use

[#1]

Hello guys

I'm trying to find solution with intervalmatch but I think I'm missing something...

I have 2 tables:

ClientsByDates
Month	ClientKey
02-2013	100
03-2013	100
04-2013	100
02-2013	101
03-2013	101
04-2013	101
02-2013	102
03-2013	102
04-2013	102

ClientsLevelels
FromMonth	ToMonth	ClientKey	Level
02-2013	03-2013	100	1
04-2013	07-2013	100	4
02-2013	03-2013	99	1
04-2013	07-2013	99	2

As a result I want to get the Client Level from second table in the first one by month:

ClientsByDates
Month	ClientKey	Level
02-2013	100	1
03-2013	100	1
04-2013	100	4
02-2013	101	-
03-2013	101	-
04-2013	101	-
02-2013	102	-
03-2013	102	-
04-2013	102	-
	99	2
	99	1

Thanks in advance for your help

[#2]

Thanks

I decided not to present client99 (thanks to you) and your solution works great