Discussion
Which of the following is the original purpose of SQL?
Answer: D
Correct answer: All of the above.
SQL was designed as a complete language for relational databases, so it covers all three.
The data definition half defines structures - CREATE, ALTER, DROP. The manipulation half queries and changes data - SELECT, INSERT, UPDATE, DELETE. Defining the data structures is what the first half achieves. That combination is what made SQL displace the separate languages the earlier database models required, and it is why one standard covers both syntax and semantics.
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