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Database Management Systems | Alkhabay Bakgeldi
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Which type of join returns all records from the left table and the matched records from the right table?
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If a subquery returns more than one row, which type of operator must be used in the main query?
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Which of the following aggregate functions does the DISTINCT option not have any effects on?
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Which set operator combines result sets of two or more SELECT statements and removes all duplicate rows?
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The EXISTS operator is evaluated to determine what?
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When the GROUP BY clause is used, the aggregate functions calculate a value for what?
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What type of subquery returns a single row and more than one column value?
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When using the AVG() function with GROUP BY, what does the GROUP BY clause do?
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If a scalar subquery is executed and returns no rows, what is the resulting scalar value taken to be?
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In a correlated subquery, the PostgreSQL evaluation typically proceeds in what direction?
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