A . 正确
B . 错误
[单选题]以下各表达式中,运算结果为字符型的是()。A . SUBSTR(’123.45’,5)B . ’IBM’$’Computer’C . AT(’IBM’,’Computer’)D . YEAR=’2000&rsquo
[单选题]运算结果是字符串“home”的表达式是( )。A.LEFT("myhome",4)B.RIGHT("hometown",4)C.SUBSTR("myhometown",4,4)D.SUBSTR("myhometown",3,4)
[单选题]运算结果是字符串“home”的表达式是( )。A.LEFT("myhome",4)B.RIGHT("hometown",4)C.SUBSTR ("myhometown",4,4)D.SUBSTR("myhometown",3,4)
[单选题]运算结果是字符串“home”的表达式是( )。A.LEFT("myhome",4)B.RIGHT("hometown",4)C.SUBSTR("myhometown",4,4)D.SUBSTR("myhometown",3,4)
[单选题]运算结果是字符串"book"的表达式是A.LEFT(″mybook″,4)B.RIGHT(″bookgood″,4)C.SUBSTR(″mybookgood″,4,4)D.SUBSTR(″mybookgood″,3,4)
[判断题] 字符型变量用来存放字符常量,注意只能放2个字符。A . 正确B . 错误
[单选题]下列各表达式中,()是正确的字符型表达式。A .职称="工程师"B .姓名+同志C .{字符串}-"表达式"D ."03"+"1"+"98"
[单选题]在下列表达式中,结果为字符型的是______。A.125-"90"B.abc+"def"="abedef"C.CTOD("99/10/01")D.DTOC(DATE()>"96/08/01"
[单选题]判断字符型变量chr为小写字母的表达式是______。A.'a'<=chr='a')||(chr判断字符型变量chr为小写字母的表达式是______。A.'a'<=chr<='z'B.(chr>='a')||(chr<='z')C.(chr>=A) &&(chr<=z)D.(chr>='a')&&(chr<='z')
[单选题]运算结果是字符串“hao”的表达式是( )。A.)LEFT(”nihao",3)B.)RIGHT(”nihao",3)C.)SUBSTR(”nihao”,3)D.)UPPER(”hao”)