Ta老师题库
设字符串S1=″ABCDEFG″，S2=″PQRST″，则运算S=CONCAT(SUBSTR(S1,2,LENGTH(S2)),SUBSTR(S1,LENGTH(S2),2))后S的结果为()【单选题
13 查阅
设字符串S1=″ABCDEFG″，S2=″PQRST″，则运算S=CONCAT(SUBSTR(S1,2,LENGTH(S2)),SUBSTR(S1,LENGTH(S2),2))后S的结果为()
A. ″BCQR ″
B. ″BCDEF ″
C. ″ BCDEFG ″
D. ″BCDEFEF ″
参考答案: