下列选项哪句可以实现显示 id 和 description,条件满足订单时间在 January 1, 1997 以前的,且单价小于 1.00 或者大于 5.00 的, 结果用订单时间降序排列
A. SELECT id_number, description FROM inventory WHERE price IN (1.00, 5.00) OR order_date < '01-JAN-97' ORDER BY order_date DESC;
B. SELECT id_number, description FROM inventory WHERE price BETWEEN 1.00 AND 5.00 OR order_date < '01-JAN-1997' ORDER BY order_date;
C. SELECT id_number, description FROM inventory WHERE price < 1.00 OR price > 5.00 AND order_date < '01 -Jan-97' ORDER BY order_date ASC;
D. SELECT id_number, description FROM inventory WHERE (price <1.00 OR price > 5.00) AND order_date < '01-JAN-1997' ORDER BY order_date DESC;
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下列关于表名称及列名称的定义,正确的有()
A. 123456
B. Abc123
C. abc$123
D. 123abc
为了避免游标出现死锁的情况,可以在创建时使用的子句是()
A. FOR UPDATE
B. FOR UPDATE OF 列名
C. FOR UPDATE WAIT
D. FOR UPDATE NOWAIT
当项目进展到50左右时,CPI处于稳定状态。 ( )
决策树分析方法是定性的评估风险的概率和后果。( )