A.SELECT r1 AS retval FROM tab1 INTERSECT SELECT r2 AS retval FROM tab2
B.SELECT r1 AS retval FROM tab1 EXCEPT SELECT r2 AS retval FROM tab2
C.SELECT DISTINCT r1 AS retval FROM tab1, tab2 WHERE r1 <> r2
D.SELECT r1 AS retval FROM tab1 UNION SELECT r2 AS retval FROM tab2
第1题:
Given:11.Stringtest="TestA.TestB.TestC.";12.//insertcodehere13.String[]result=test.split(regex);Whichregularexpression,insertedatline12,correctlysplitstestinto"TestA","TestB",and"TestC"?()
A.Stringregex="";
B.Stringregex="";
C.Stringregex=".*";
D.Stringregex="\\s";
E.Stringregex="\\.\\s*";
第2题:
第3题:
第4题:
[A] set [B] exact [C] given [D] placed
第5题:
第6题:
4、下面的程序是否能够正常执行,若不能,请解释原因;若能,请分析其执行结果。 from random import randint result = set() while True: result.add(randint(1,10)) if len(result)==20: break print(result)