【071题库】最新OCP-071考试题库解析-第46题
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071题库-第46题、choose two:
Examine the data in the CUST_NAME column of the CUSTOMERS table.
CUST_NAME
----------------------
Lex De Haan
Renske Ladwig
Jose Manuel Urman
Jason Mallin
You want to extract only those customer names that have three names and display the * symbol in
place of the first name as follows:
CUST_NAME
-----------------------
*** De Haan
**** Manuel Urman
Which two queries give the required output?
A) SELECT LPAD(SUBSTR(cust_name,INSTR(cust_name,' ')),LENGTH(cust_name),'*') "CUST NAME" FROM customers
WHERE INSTR(cust_name, ' ',1,2)<>0;
B) SELECT LPAD(SUBSTR(cust_name,INSTR(cust_name,' ')),LENGTH(cust_name)- INSTR(cust_name,' '),'*') "CUST NAME"
FROM customers
WHERE INSTR(cust_name, ' ',1,2)<>0 ;
C) SELECT LPAD(SUBSTR(cust_name,INSTR(cust_name,' ')),LENGTH(cust_name),'*') "CUST NAME"
FROM customers
WHERE INSTR(cust_name, ' ',-1,2)<>0;
D) SELECT LPAD(SUBSTR(cust_name,INSTR(cust_name,' ')),LENGTH(cust_name)- INSTR(cust_name,' '),'*') "CUST NAME"
FROM customers
WHERE INSTR(cust_name, ' ',-1,-2)<>0;
Answer:AC
(解析:题意是:您希望只提取具有三个名称的那些客户名称,并显示*符号来代替名称如下注意条件的用法 INSTR(cust_name, ' ',1,2)<>00,意思是从名字中找空格,从第一个开始,查看第二个空格的位置,如果有,说明名字里面就有三个名称,否则只有两个名称。同时INSTR(cust_name, ' ',-1,-2),从倒数第一个空格开始,不能再用-2 了,要用正数)
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