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 column

A main query can have more than one subquery.

A subquery can have more than one main query.

The subquery and main query must retrieve data from the same table.

The subquery and main query can retrieve data from different tables.

Only one column or expression can be compared between the subquery and main query.

Multiple columns or expression can be compared between the subquery and main query.

You can use aggregate functions in any clause of a SELECT statement.

You can use aggregate functions only in the column list of the SELECT clause and in the WHERE clause of a SELECT statement.

You can mix single row columns with aggregate functions in the column list of a SELECT statement by grouping on the single row columns.

You can pass column names, expressions, constants, or functions as parameters to an aggregate function.

You can use aggregate functions on a table, only by grouping the whole table as one single group.

You cannot group the rows of a table by more than one column while using aggregate functions.

A single row subquery can retrieve data from only one table.

A 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.

A SQL query statement can display data from table B that is referred to in its subquery, without including B in its own FROM clause.

A single row subquery can retrieve data from more than one table.

A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.

A multiple-row subquery cannot be used in an INSERT statement to insert multiple rows at a time.

A subquery should retrieve only one row.

A subquery can retrieve zero or more rows.

A subquery can be used only in SQL query statements.

Subqueries CANNOT be nested by more than two levels.

A subquery CANNOT be used in an SQL query statement that uses group functions.

When 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.

They can accept only one argument.

They can be nested up to only two levels.

They can return multiple values of more than one data type.

They can be used in SELECT， WHERE， and ORDER BY clauses.

They can modify the data type of the argument that is referenced.

They can accept a column name， expression， variable name， or a user-supplied constant as arguments.

A subquery can retrieve zero or more rows

Only two subqueries can be placed atone level

A subquery can be used only in SQL query statements

A subquery can appear on either side of a comparison operator

There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement

A single row subquery can retrieve data from only one table.

A 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.

A 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.

A single row subquery can retrieve data from more than one table.

A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.

A multiple-row subquery cannot be used in a condition where the LIKE operator is used for comparison.

The LIKE operator cannot be used with single-row subqueries 

The NOT IN operator is equivalent to IS NULL with single-row subqueries 

=ANY and =ALL operators have the same functionality in multiple-row subqueries 

The NOT operator can be used with IN, ANY, and ALL operators in multiple-row subqueries 

cannot be nested

manipulate data items

act on each row returned

return one result per row

accept only one argument and return only one value

accept arguments which can be a column or an expression

They accept only a single argument

They can be nested only to two levels

Arguments can only be column values or constants

They always return a single result row for every row of a queried table

They can return a data type value different from the one that is referenced