Question: 1. Using the following data, write relational algebra expressions to answer the following ques- tions. MessierCatalog Type SNR Tau Nebula SgT ame Constellation CId Name

1. Using the following data, write relational algebra expressions to answer

1. Using the following data, write relational algebra expressions to answer the following ques- tions. MessierCatalog Type SNR Tau Nebula SgT ame Constellation CId Name M1 Crab Nebula M8 Lagoon Nebula M13 Hercules Cluster Glob M27 Dumbbell Nebula Nebula Vul M31 Andromeda Galaxy Gy And M42 Orion Nebula M45 Pleiades rea Andromeda 722.278 1225.148 594.120 Sgr Sagittarius 264.235 242.856 Her Her Hercules Ori Orion Nebula Ori Open Tau Tau Taurus (a) How many Messier objects are there of each type. E.g., there's 1 SNR and 2 nebulae. (b) Which constellation has the most objects of each type. E.., Taurus has the most SNRs

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