关于模式分解,有下述说法:
①若要求分解保持函数依赖,那么分解后的关系模式总可以达到3NF,但不一定能达到BCNF。
②若要求分解既保持函数依赖又具有无损连接性,则可以达到3NF,但不一定能达到 BCNF。
③若要求分解具有无损连接性,那么一定可以达到4NF。
其中,正确的说法有(30)。
(72)
(70)
(71)
XP is (71) of interesting twists that encourage one to think--for example, how about "Test and then code"? I've worked with software companies and a few IT organizations in (72) programmer performance was measured on lines of code delivered and testing was measured on defects found-- (73) side was motivated to reduce the number of defects prior to testing. XP uses two types of testing: unit and functional. (74) , the practice for unit testing involves developing the test for the feature prior to writing the code and further states that the tests should be automated. Once the code is written, it is immediately (75) to the test suite bringing instant feedback.
(69)
(66)
(67)
MPEG-4是(53),MPEG-4主要由音频编码、视频编码、数据平面、(54)、缓冲区管理和实时识别等部分构成,其中数据平面包括(55)两部分。
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