First, it might be worth getting an understanding of what SIC and NAICS codes are. So here's a Library Guide that can help define and understand NASICS or SIC codes.
Note that one of the boxes on the guide links you to sites where you can look up the codes for an industry. And another allows you to look up a target company and identify their primary SIC.
Here's another Library Guide that talks about SIC and links to databases that have industry information in them:
A database that might be helpful is First Research which allows you to search by SIC or NAICS, as well as by keyword. This resource gives you overarching industry information.
And many databases--ones you probably use a lot--have the option of searching by SIC or NAICS, too. For example, in Business Source Complete, our best general business database, that is a searchable field. So you can search for 312111 (which is the NAICS for products like fruit drinks and soft drinks) and find items such as Industry Reports.
I hope this gets you started. Please stop in and visit us at the Reference Desk for more help.