单项选择题
A.where customer =‘LESLIE’;
B.where customer =‘LESLIE’and order_amt <2700;
C.where customer =‘LESLIE’or order_amt >2700;
D.where customer =‘LESLIE’and order_amt >2700;
单项选择题 DTEST表包含两个列,TESTCOL定义为数据类型NUMBER(10),TESTCOL_2定义为数据类型VARCHAR2(10)。在Oracle中发出下列语句:insert into test(testcol,testcol_2)values (null,‘FRANCIS’),然后对表进行下列查询:select nvl(testcol,‘EMPTY’)as testcol from test where testcol_2=‘FRANCIS’。下列选项哪个是得到的结果?()
多项选择题 以下选项中哪个是发出下列查询后Oracle返回的值:select *from emp where hiredate >’23-JAN-82’?()
单项选择题 以下选项中哪个是发出下列查询后Oracle返回的值:select trunc(months_between(min(hiredate),max(hiredate)))from emp ?()