试题详情
- 多项选择题 Examine the description of the STUDENTS table: STD_ID NUMBER(4) COURSE_ID VARCHAR2(10) START_DATE DATE END_DATE DATE Which two aggregate functions are valid on the START_DATE column? （ ）
A、SUM（start_date）
B、AVG（start_date）
C、COUNT（start_date）
D、AVG（start_date，end_date）
E、MIN（start_date）
F、MAXIMUM（start_date）
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