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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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Which two statements are true regarding single row functions?（）

A.They accept only a single argument
B.They can be nested only to two levels
C.Arguments can only be column values or constants
D.They always return a single result row for every row of a queried table
E.They can return a data type value different from the one that is referenced

多項(xiàng)選擇題

You need to generate a list of all customer last names with their credit limits from the CUSTOMERS table. Those customers who do not have a credit limit should appear last in the list. Which two queries would achieve the required result?（）

A.SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit DESC
B.SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit
C.SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit NULLS LAST
D.SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_last_name, cust_credit_limit NULLSLAST

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Which two statements are true regarding subqueries? （）

你可能感興趣的試題

Which two statements are true regarding single row functions?（）

You need to generate a list of all customer last names with their credit limits from the CUSTOMERS table. Those customers who do not have a credit limit should appear last in the list. Which two queries would achieve the required result?（）

97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久