How do you construct a join operation in an sql select
1. How do you construct a Join operation in an SQL SELECT statement?
2. What is a subquery in an SQL SELECT statement?
3. Describe the circumstances in which a subquery must be used.
4. What is a relational query optimizer? Why are they important?
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1 how do you construct a join operation in an sql select statement2 what is a subquery in an sql select statement3
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