You should identify the industry that your target company operates in by using a standard industry classification code such as NAICS.
What is NAICS?
You should first look up the NAICS Canada code, which is used mainly in Statistics Canada databases and publications.
As some Business Library Databases use the US version of the NAICS manual, it is also helpful to be able to cross-reference your NAICS code there, as the numbers can be slightly different. In addition, as the US economy is vastly larger than the Canadian, they have a more comprehensive classification system.