设字符串S1=″ABCDEFG″,S2=″PQRST″,则运算S=CON
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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: