inventory database design

Tags: blog http io using data SP C on logThe main functions we need in terms of database are as follows: The contact has a name and e-mail address. A contact can have more than one address. Contacts can have multiple phones. In order to achieve the goal, we need to create the following tables in the database.The table-to-table relationship is as follows:The database script can be downloaded di

If we want to migrate an old database system to a new database system, it is a great challenge to understand the data structure in the old database system, especially when we have to use early databases on other DBMS platforms, it is even more difficult. The tools provided by visio enableProgramSmoother, it uses a powerful reverse engineering Wizard to retrieve

Here is a preliminary design with PowerDesigner, which may be modified later.1. Start PowerDesigner New physical data model2. Tool bar3. New Table Model4, add the first table, you can double-click the table or the right-click menu to open the following windowDon't forget to select the owner of dbo and switch to the Columns tabUpon completion, the form of the table was of this virtue.Follow this procedure to add additional tables in turn6. Add Table re

way to handle. For example, often to edit or modify the picture, then stored in the database is a good choice.Second, the solution uses BLOB types when neededWhen stored, use a binary blob to store the file.Pictures are stored in the database and do not require additional loading, and there is no risk of incorrect file paths.Deleting a record also deletes the picture.When the record is updated, locks are a

Label:Three products of demand analysis: Business concept map, business flowchart, use case.Two inputs for database analysis: Business concept map, business flowchart.There are two types of business Modeling: Business Architecture modeling and business behavior modeling.Business Structure Modeling: The data structure is mainly analyzed;Business Behavior Modeling: The process, process and so on are mainly analyzed.Learn e-p diagram (entity diagram) and

relationships. So its data structure is simple, clear, user-friendly access path transparent: With higher data independence, better security confidentiality, simplifying the programmer's work, improve the software development and maintenance efficiency The main disadvantages are: Because the access path is transparent to the user, the query efficiency is often inferior to the non relational data model in order to improve the performance, the DBMS must query and optimize the user's quer

Introduction If you are not clear about the "three paradigms", please click here (FQ) to learn step-by-step what is "three normal". It is said that standard specification is an important guideline and is doing so, but remembering it as a mark on a stone can still cause trouble. The following 11 points are my top priority in database design. Rule 1: Figure out what the nature of the application will be devel

As a project analysis, database design is a very important and difficult problem, Completely in accordance with the paradigm may not meet user needs, not conducive to programming, It seems to be a concrete analysis of specific problems, database design is a compromise between paradigm and demand. When I was at school,

Tags: style color os strong data SP on C lineIntroduction to the three paradigmsThe paradigm of the table: only the first normal paradigm can satisfy the second paradigm, and the third paradigm can be satisfied further.1. The first paradigm :The columns of the table are atomic and can no longer be decomposed. As long as the relational database is automatically satisfied with the first normal form.Classification of databases:Relational

I. Database Design Process Database technology is the most effective means of information resource management. Database Design refers to constructing the optimal database mode for a given application environment, establishing a

　　I. Database Design ProcessDatabase technology is the most effective means of information resource management. Database Design refers to constructing the optimal database mode for a given application environment, establishing a database