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A、let “s=4|3”;echo $s
B、((s=4|3));echo $s
C、echo “$(( 4|3))”
D、echo s=4|3
A、let “s=4|3”;echo $s
B、((s=4|3));echo $s
C、echo “$(( 4|3))”
D、echo s=4|3
此题为判断题(对,错)。
A、先求表达式1的值,如果为真,则执行表达式2,并返回表达式2的结果
B、先求表达式1的值,如果为真,则执行表达式3,并返回表达式3的结果
C、如果表达式1的值为假,则执行表达式2,并返回表达式2的结果
D、如果表达式1的值为真,则执行表达式2和3,并返回表达式2和3的结果
A.2
B.3
C.4
D.编译时有错,无结果
A.1,1
B.2,2
C.3,3
D.4,4
E.6
F.3 G. 死循环 H. 0 I. 15 J. 14 K. 不确定 L. 0 M. P的值不等于12345并且n的值小于3 N. P的值等于12345并且n的值大于等于3 O. P的值不等于12345或者n的值小于3 P. P的值等于12345或者n的值大于等于3 Q. 20 R. 31 S. 321 T. 210 U. i=10,sum=9 V. i=9,sum=9 W. i=2,sum=1 X. 运行出现错误 Y. 20 Z. 19 [. 10 . 9 ]. 0 ^. 1 _. true `. 非0 A.0
B.1
C.true
D.非0
E.while循环执行10次
F.循环是无限循环 g. 循环体语句一次也不执行 h. 循环体语句执行一次 i. for
有关系代数表达式:与其执行结果等价的pgSQL语句为( )。
A、SELECT * FROM eeexam,examinee WHERE examinee.eeid=eeexam.eeid;
B、SELECT * FROM eeexam CROSS JOIN examinee WHERE examinee.eeid=eeexam.eeid;
C、SELECT * FROM eeexam NATURAL JOIN examinee;
D、SELECT * FROM eeexam JOIN examinee ON examinee.eeid=eeexam.eeid;
E、SELECT * FROM eeexam JOIN examinee USING(eeid);
F、SELECT * FROM eeexam CROSS JOIN examinee;
G、SELECT * FROM eeexam NATURAL JOIN examinee WHERE examinee.eeid=eeexam.eeid;
H、SELECT * FROM eeexam JOIN examinee WHERE examinee.eeid=eeexam.eeid;
A、int i=0,j=1; i=3, (j++)+i;
B、int i=1,j=0; j=i=(i*3)*2;
C、int i=0,j=1; (j==1)(i=1):(i=3);
D、int i=1,j=1; i+=j+=2;
有关系代数表达式:与其执行结果等价的pgSQL语句为( )。
A、SELECT * FROM eeexam,examinee WHERE examinee.eeid=eeexam.eeid;
B、SELECT * FROM eeexam CROSS JOIN examinee WHERE examinee.eeid=eeexam.eeid;
C、SELECT * FROM eeexam NATURAL JOIN examinee;
D、SELECT * FROM eeexam JOIN examinee ON examinee.eeid=eeexam.eeid;
E、SELECT * FROM eeexam JOIN examinee USING(eeid);
F、SELECT * FROM eeexam,examinee;
G、SELECT * FROM eeexam CROSS JOIN examinee;
H、SELECT * FROM eeexam NATURAL JOIN examinee WHERE examinee.eeid=eeexam.eeid;
I、SELECT * FROM eeexam JOIN examinee WHERE examinee.eeid=eeexam.eeid;
有关系代数表达式:与其执行结果等价的pgSQL语句为( )。
A、SELECT DISTINCT examinee.eeid,eename,eid FROM eeexam,examinee WHERE examinee.eeid=eeexam.eeid;
B、SELECT DISTINCT examinee.eeid,eename,eid FROM eeexam CROSS JOIN examinee WHERE examinee.eeid=eeexam.eeid;
C、SELECT DISTINCT eeid,eename,eid FROM eeexam NATURAL JOIN examinee;
D、SELECT DISTINCT examinee.eeid,eename,eid FROM eeexam JOIN examinee ON examinee.eeid=eeexam.eeid;
E、SELECT DISTINCT eeid,eename,eid FROM eeexam JOIN examinee USING(eeid);
F、SELECT DISTINCT examinee.eeid,eename,eid FROM eeexam,examinee;
G、SELECT DISTINCT examinee.eeid,eename,eid FROM eeexam CROSS JOIN examinee;
H、SELECT DISTINCT eeid,eename,eid FROM eeexam NATURAL JOIN examinee WHERE examinee.eeid=eeexam.eeid;
I、SELECT DISTINCT examinee.eeid,eename,eid FROM eeexam JOIN examinee WHERE examinee.eeid=eeexam.eeid;
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