question archive (a) What is the difference between projecting and joining? (b) How can a data dictionary be useful to database administrators and DBMS software engineers? (c) What is data modeling? What is its purpose? Briefly describe three commonly used data models
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(a) What is the difference between projecting and joining? (b) How can a data dictionary be useful to database administrators and DBMS software engineers? (c) What is data modeling? What is its purpose? Briefly describe three commonly used data models