某数据库中有供应商关系S和零件关系P,其中:供应商关系模式S(Sno,Sname,Szip,City)中的属性分别表示:供应商代码、供应商名、邮编、供应商所在城市;零件关系模式P(Pno,Pname,Color, Weisht,City)中的属性分别表示:零件号、零件名、颜色、重量、产地。要求一个供应商可以供应多种零件,而一种零件可以由多个供应商供应。请将以下(62)空缺处的SQL语句补充完整。 CREATE TABLE SP(Sno CHAR(5), Pno CHAR(6), Status CHAR(8), QLy NUMERIC(9), PRIMARY KEY(Sno,Pno) (62);
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By using MP3, a 600M-byte music CD can be(70)to 50M bytes or less. It can be streamed(downloaded in chunks)so that you can begin listening to the opening bars while the(71)of the file arrives in the background. And, most important, MP3 music files retain good listening(72)that(73)compression schemes lacked. That(74)of features makes accessing and distributing music on the Web practical for the first time.
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The following suggestions increase program's(73)and make them easier to(74):
Use a standard indention technique, blank lines, form. feeds, and spaces.
Insert plenty of comments into your code.
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In C language,(70)variables have to be defined outside of any function, this(71)actual storage for it.
when a string constant is written in C program, the eompiler creates(75)of characters containing the characters of the string, and terminating it with "\0".
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