单选题Which operator can be used with a multiple-row subquery? （）A=BLIKECBETWEENDNOT INEISF
单选题
Which operator can be used with a multiple-row subquery? （）
A
=
B
LIKE
C
BETWEEN
D
NOT IN
E
IS
F
<>
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解析：
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You define a multiple-row subquery in the WHERE clause of an SQL query with a comparison operator "=".What happens when the main query is executed?（）A、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、The main query fails because the multiple-row subquery cannot be used with the comparison operator.E、You cannot define a multiple-row subquery in the WHERE clause of a SQL query.
Which statement is true regarding subqueries?（）A、The LIKE operator cannot be used with single-row subqueries B、The NOT IN operator is equivalent to IS NULL with single-row subqueries C、=ANY and =ALL operators have the same functionality in multiple-row subqueries D、The NOT operator can be used with IN, ANY, and ALL operators in multiple-row subqueries
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多选题Which two statements are true regarding views?（）AA subquery that defines a view cannot include the GROUP BY clauseBA view that is created with the subquery having the DISTINCT keyword can be updatedCA view that is created with the subquery having the pseudo column ROWNUM keyword cannot be updatedDA data manipulation language (DML) operation can be performed on a view that is created with the subquery having all the NOT NULL columns of a table
单选题Which statement is true regarding subqueries?（）AThe LIKE operator cannot be used with single-row subqueries BThe NOT IN operator is equivalent to IS NULL with single-row subqueries C=ANY and =ALL operators have the same functionality in multiple-row subqueries DThe NOT operator can be used with IN, ANY, and ALL operators in multiple-row subqueries
多选题Which two statements about subqueries are true? （）AA single row subquery can retrieve data from only one table.BA SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.CA SQL query statement can display data from table B that is referred to in its subquery, without including table B in its own FROM clause.DA single row subquery can retrieve data from more than one table.EA single row subquery cannot be used in a condition where the LIKE operator is used for comparison.FA multiple-row subquery cannot be used in a condition where the LIKE operator is used for comparison.
单选题A subquery can be used to （）.ACreate groups of dataBSort data in a specific orderCConvert data to a different formatDRetrieve data based on an unknown condition
多选题In which four clauses can a subquery be used? （）Ain the INTO clause of an INSERT statementBin the FROM clause of a SELECT statementCin the GROUP BY clause of a SELECT statementDin the WHERE clause of a SELECT statementEin the SET clause of an UPDATE statementFin the VALUES clause of an INSERT statement
单选题You define a multiple-row subquery in the WHERE clause of an SQL query with a comparison operator "=".What happens when the main query is executed?（）AThe main query executes with the first value returned by the subquery.BThe main query executes with the last value returned by the subquery.CThe main query executes with all the values returned by the subquery.DThe main query fails because the multiple-row subquery cannot be used with the comparison operator.EYou cannot define a multiple-row subquery in the WHERE clause of a SQL query.
多选题Which three statements about subqueries are true?（）AA single row subquery can retrieve only one column and one row.BA single row subquery can retrieve only one row but many columns.CA multiple row subquery can retrieve multiple rows and multiple columns.DA multiple row subquery can be compared by using the operator.EA single row subquery can use the IN operator.FA multiple row subquery can use the = operator.
多选题Which three statements about subqueries are true? （）AA main query can have more than one subquery.BA subquery can have more than one main query.CThe subquery and main query must retrieve data from the same table.DThe subquery and main query can retrieve data from different tables.EOnly one column or expression can be compared between the subquery and main query.FMultiple columns or expression can be compared between the subquery and main query.
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
多选题Which two statements about subqueries are true? （）AA subquery should retrieve only one row.BA subquery can retrieve zero or more rows.CA subquery can be used only in SQL query statements.DSubqueries CANNOT be nested by more than two levels.EA subquery CANNOT be used in an SQL query statement that uses group functions.FWhen a subquery is used with an inequality comparison operator in the outer SQL statement, the column list in the SELECT clause of the subquery should contain only one column.
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
多选题Which two statements about subqueries are true? （）AA single row subquery can retrieve data from only one table.BA SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.CA SQL query statement can display data from table B that is referred to in its subquery, without including B in its own FROM clause.DA single row subquery can retrieve data from more than one table.EA single row subquery cannot be used in a condition where the LIKE operator is used for comparison.FA multiple-row subquery cannot be used in an INSERT statement to insert multiple rows at a time.