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多选题
Which two statements are true regarding the execution of the correlated subqueries？（）
A
The nested query executes after the outer query returns the row.
B
The nested query executes first and then the outer query executes.
C
The outer query executes only once for the result returned by the inner query.
D
Each row returned by the outer query is evaluated for the results returned by the inner query.
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更多 “多选题Which two statements are true regarding the execution of the correlated subqueries？（）AThe nested query executes after the outer query returns the row.BThe nested query executes first and then the outer query executes.CThe outer query executes only once for the result returned by the inner query.DEach row returned by the outer query is evaluated for the results returned by the inner query.” 相关考题
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The optimizer used re-optimization cardinality feedback for the query.D
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单选题What is true regarding subqueries?（）A
The inner query always sorts the results of the outer query.B
The outer query always sorts the results of the inner query.C
The outer query must return a value to the inner query.D
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The inner query must always return a value or the outer query will give an error.
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The main query executes with the first value returned by the subquery.B
The main query executes with the last value returned by the subquery.C
The main query executes with all the values returned by the subquery.D
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Exhibit AB
Exhibit BC
The query returns no rowsD
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多选题Which three statements are true regarding subqueries?（）ASubqueries can contain GROUP BY and ORDER BY clausesBMain query and subquery can get data from different tablesCMain query and subquery must get data from the same tablesDSubqueries can contain ORDER BY but not the GROUP BY clauseEOnly one column or expression can be compared between the main query and subqueryFMultiple columns or expressions can be compared between the main query and subquery
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单选题What is true regarding subqueries?（）A
The inner query always sorts the results of the outer queryB
The outer query always sorts the results of the inner queryC
The outer query must return a value to the outer queryD
The inner query returns a value to the outer queryE
The inner query must always return a value or the outer query will give an error
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多选题Top N analysis requires （） and （）.Athe use of rowidBa GROUP BY clauseCan ORDER BY clauseDonly an inline viewEan inline view and an outer query
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