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多选题
Which two statements are true regarding subqueries? （）
A
A subquery can retrieve zero or more rows
B
Only two subqueries can be placed atone level
C
A subquery can be used only in SQL query statements
D
A subquery can appear on either side of a comparison operator
E
There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement
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更多 “多选题Which two statements are true regarding subqueries? （）AA subquery can retrieve zero or more rowsBOnly two subqueries can be placed atone levelCA subquery can be used only in SQL query statementsDA subquery can appear on either side of a comparison operatorEThere is no limit on the number of subquery levels in the WHERE clause of a SELECT statement” 相关考题
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考题
单选题Which best describes an inline view?（）A
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another name for a view that contains group functionsD
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考题
多选题Which two statements are true about WHERE and HAVING clauses? （）AA WHERE clause can be used to restrict both rows and groups.BA WHERE clause can be used to restrict rows only.CA HAVING clause can be used to restrict both rows and groups.DA HAVING clause can be used to restrict groups only.EA WHERE clause CANNOT be used in a query of the query uses a HAVING clause.FA HAVING clause CANNOT be used in subqueries.
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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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