Clean the table top with a glass cleaner to remove any grease or dirt. Wipe dry with paper towel.
Mix a 2-part epoxy resin together according to the package instructions. Some adhesives mix automatically when the tube's plunger is depressed, simplifying the task.
Spread a thin line of the adhesive into the crack on both sides of the glass. Ensure the epoxy gets into the crack as far as possible.
Leave the epoxy to cure according to package instructions. This can take several days, depending on the epoxy.
Scrape off any excess epoxy with a razor blade by holding it flat against the glass surface.