题目内容
（请给出正确答案）
关系代数表达式：![关系代数表达式： [图] ...关系代数表](http://static.jiandati.com/dc852df-chaoxing2016-323490.jpeg)
其对应的SQL语句为（）。
A、SELECT * FROM examinee;
B、SELECT DISTINCT eename,eeage,eesex FROM examinee;
C、SELECT * FROM examinee(eename,eeage,eesex);
D、SELECT eename,eeage,eesex ;
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第2题
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;
第3题
关系代数表达式：
其对应的SQL语句为（ ）。
A、SELECT eename,eeage,eesex FROM examinee WHERE eeage>=18 AND eeage<=23;<br> B、SELECT * FROM examinee WHERE eeage>=18 AND eeage<=23;<br> C、SELECT eename,eeage,eesex FROM examiner WHERE eeage>=18 AND eeage<=23;<br> D、SELECT eename,eeage,eesex FROM examinee WHERE 18<=eeage<=23;<br> E、SELECT eename,eeage,eesex FROM examinee WHERE eeage>=18 HAVING eeage<=23;<br> F、SELECT eename,eeage,eesex FROM examinee HAVING eeage>=18 AND eeage<=23;<br> G、SELECT eename,eeage,eesex FROM examinee HAVING eeage>=18 OR eeage<=23;<br> H、SELECT eename,eeage,eesex FROM examinee WHERE eeage>=18 OR eeage<=23;<br>
第4题
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;
第5题
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;
第6题
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;
第7题
关系代数表达式：其对应的SQL语句为（ ）。
A、SELECT * FROM examinee;
B、SELECT DISTINCT eename,eeage,eesex FROM examinee;
C、SELECT * FROM examinee(eename,eeage,eesex);
D、SELECT eename,eeage,eesex ;
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