?? 1.2.30.sql
字號:
SELECT TID
FROM CHOICES
WHERE CHOICES.CID=
(
SELECT COURSES.CID
FROM COURSES
WHERE COURSES.CNAME='c++'
)
UNION
SELECT TID
FROM CHOICES
WHERE CHOICES.CID=
(
SELECT CID
FROM COURSES
WHERE COURSES.CNAME='java'
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