The complete ionic equation for the reaction between \(Na_2SO_4\) and \(CaCl_2\) is:

$$2Na^+(aq) + SO_4^{2-}(aq) + Ca^{2+}(aq) + 2Cl^-(aq) → 2Na^+(aq) + 2Cl^-(aq) + CaSO_4(s)$$

The net ionic equation, which shows only the species that participate in the reaction, is:

$$Ca^{2+}(aq) + SO_4^{2-}(aq) → CaSO_4(s)$$