Which four statements correctly describe functions that are available in SQL? （） INSTR returns the numeric position of a named character.。 NVL2 returns the first non-null expression in the expression list.。 TRUNCATE rounds the column, expression, or value to n decimal places.。 DECODE translates an expression after comparing it to each search value.。 TRIM trims the heading of trailing characters (or both) from a character string.。 NVL compares two expressions and returns null if they are equal, or the first expression of they are not equal.。 NULLIF compares twp expressions and returns null if they are equal, or the first expression if they are not equal.。
HTTP的会话有多个过程，包括（） 建立连接。 发出请求信息。 发出响应信息。 传输数据。
Which command will allow the creation of a 10-character login user name？（） A.chlogin -a log_name=10。 B.chdev -l sys0 -a max_logname=10。 C.chusr extended_logname=true [userid]。 D.chuser login_name=10 extended_logname=true [userid]。
A banking customer orders three IBM BladeCenter E chassis and thirty-four HS22 blades. Theustomer wants to fully populate the chassis with blades where possible. Which of the following is the minimum number of power cables required to provide redundancy? （） 12 。 10 。 8 。 6。
在房地产评估中应用收益法的适用范围是（） 租赁性房地产。 企业自用房地产。 销售性房地产。 居住性房地产。
A customer’s server is experiencing slow application response due to lack of processor power. In which one of the following systems would the addition of the Expand On Demand processor upgrade feature benefit future expansion？（）
