题目内容
（45 ）数据库中数据项 A 和数据项 B 的当前值分别为 1000 和 2000 ， T 1 和 T 2 为两个事务，
调度一和调度二是事务 T 1 和 T 2 的两个调度。
下列说法正确的是
A ）调度一是串行调度，调度二是并发调度，它们等价
B ）调度一和调度二都是并发调度，它们等价
C ）调度二执行后，数据项 A 和 B 的值分别为 950 和 2100
D ）调度一执行后，数据项 A 和 B 的值分别为 950 和 2050
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