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

$$2Na^+_{(aq)} + SO_4^{2-}_{(aq)} + Ca^{2+}_{(aq)} + 2Cl^-_{(aq)} \longrightarrow CaSO_{4(s)} + 2Na^+_{(aq)} + 2Cl^-_{(aq)}$$

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

$$Ca^{2+}_{(aq)} + SO_4^{2-}_{(aq)} \longrightarrow CaSO_{4(s)}$$