First it is an entity, it is able to keep the data "warehouse", the user can be stored in the warehouse management they want the transaction data, its storage space is very big, can hold one million, article ten million, article hundreds of millions of data,
The second it is also a new method and technology of data management, it can be a more appropriate data organization, more convenient maintenance data, more strict control data and use the data effectively,
In general, the database is according to the data structure to organize, storage and management of data warehouse, is a long-term stored inside a computer, organized, have Shared, certain rules, unified management of data collection,
Is stored in together in a certain way, it can be Shared with multiple users, with as little redundancy as possible, with data collection applications independent of each other, can be considered as electronic filing cabinets, users can to new data in a file, query, update, delete operations, such as
The data table
It is a temporary storage data grid virtual table data in the memory of a table (said), it can be created and used independently, can also by the other. Using.net Framework objects, most commonly used as a member of the DataSet, it is the core object in ADO dot NET library, it can be applied in VB and ASP, it does not need to code can simple binding database, it is the user interface of the Microsoft style,
Field
We put each row in the table is called a "record", each record contains all the information in this line, like a person all of the information in the address book database, but the records in the database and no special records, often with rows said this is what it is in a record field is smaller than the record unit, field collection of records, each field description documents of a particular feature, namely data items, and there are only for computer recognition field identifier,
CodePudding user response:
Learning, thanks for sharing.
CodePudding user response:
CodePudding user response:
Notes class knowledge, however, suggest you still on the blog,