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【多选题】
若有“选课”表,其关系模式为:选课 ( 学号 , 课程号 , 成绩 ) ,下列哪些语句可以实现查询选修了“ B01” 或 “B02” 课程的学生学号和所选课程的课程号的功能?
A.
SELECT 学号 , 课程号 FROM 选课 WHERE 课程号 ='B01' UNION SELECT 学号 , 课程号 FROM 选课 WHERE 课程号 ='B02'
B.
SELECT 学号 , 课程号 FROM 选课 WHERE 课程号 ='B01' OR 课程号 ='B02'
C.
SELECT 学号 , 课程号 FROM 选课 WHERE 课程号 IN ('B01','B02')
D.
SELECT 学号 , 课程号 FROM 选课 WHERE 课程号 ='B01' AND 课程号 ='B02'
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