连接SQServer数据库-毕业论文外文文献翻译.docxVIP

To connect SQL Server databaseFirst we introduce the basic knowledge of the database,be regarded as the warm-up exercise that study database weave distance front!1.warm-up exerciseNeeding first avowal is relation database that database knowledge that we here introduce all point. The so-called relation database is to mean data as that the form gather, passing to establish simple form an a kind of database for of relation to defining construction.I ignore the watch at how saving way in physics in the document in database is,it can see to make an a line for with row, with electronics form is similar with the row.In relation database, the line were called the record, but the row then is called word segment.This form inside each an all in formations for is a record, it including particular customer, but each record then included the same type with the word segment of the quantity:Customers number, name etc.Form is logic set that a kind of related information that press a line of arranging with row, similar in single form in work.Each row of the word a database form inside calls a word segment. Watch is from every kind of word a definition of its containment of, each word a data for describing its implying. While creating to set up a database, the beard assign for each word segment a the piece belongs to the sex with the other according to the type,biggest length.The word segment can include every kind of word sign,arithmetic figure even sketch.An information of relevant customer deposits in the line of the form, is called record.By any large, arbitrarily two records for database form to create set up cant be same.Key be a certain word segment( or several words segment) of the form inside, it() for fast inspect but drive index. The key can be unique, and also can then the right and wrong is unique, being decided by it() whether admission repetition. Unique key can specify for main key, using each one that come to unique marking form.The norm turns the database design of m