外文翻譯---access2000關(guān)系型數(shù)據(jù)庫(kù)-數(shù)據(jù)庫(kù)-文庫(kù)吧
2025-04-17 11:17 本頁(yè)面
【正文】 no longer limited to text data and other simple data types. And the description and the need to preserve a lot of plex unstr uctured multimedia data, and the relationship between the data. Furthermore, in the wake of popular websites surge in the number of visits to its own database storage mechanism, a large number of concurrent users to the demand, storage efficiency in the use of space, and data integrity and security, and other aspects of higher demand. These are not traditional relational database, the use of a simple twodimensional table structure of the meet. Access2020 is the relational database development tools, database pooling information for the inquiry, Storage and retrieval. Access2020 the advantage lies in its ability to use data map or custom windows to collect information. Data provides a map similar to the Excel spreadsheet, database transparent. In addition, the Access2020 allows creation of custom statements to print or export the information in the database. Access2020 also provides a data repository. Can use desktop database file to extend the database file at the work file server and other work users to share databases? Access2020 is a relational database tools, database development, is the most mon databases. As noted above, as an Access2020 database development possesses many advantages, in a data packet available at the same time facilitate the desktop database and a powerful relational database functions. In Access2020, with the user database access permissions are two types: Explicit and implicit powers authority. Explicit authority is granted a direct user account petence, which is the exclusive use of user accounts, has nothing to do with other users. Implicit authority is delegated the authority group account, the user added to the group was given by the group39。s mandate. If a user with the same time these two powers, the right set of user security database for a visit, then He had such authority is the intersection of the two powers. The Access20202020database, the group of users’ access to the database and the authority set up work, pleted only through the administrator. Set up the authority include: Open/Run, read design, design modifications, management, read data, update data insertion and deletion of data. Relational database management system inherent limitations in the following three aspects: Relational database used in the twodimensional table data model, can not effectively handle the majority of business applications, Typical of multidimensional data. Its inevitable result is that in plex ways, the interaction of the dramatic increase in the number of tables, not very good but also to provide
畢業(yè)設(shè)計(jì)相關(guān)推薦
鄂ICP備17016276號(hào)-1