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The recent discovery of bulk superconductivity in trilayer nickelate ${\mathrm{La}}_{4}{\mathrm{Ni}}_{3}{\mathrm{O}}_{10}$ under high pressure is attracting a new wave of research interest. In this Letter, we study its electronic band structure and construct a minimal trilayer tight-binding model in terms of the nickel $3{d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ and $3{d}_{3{z}^{2}\ensuremath{-}{r}^{2}}$ orbitals, and investigate the superconducting …