inventory database design

complex database access logic, however, it is a good embodiment of the "80/20 (or 90/10) Law" (also known as the "Pareto Law"), that is: less flowers (10%-20%) the effort can solve most of the problems (80%-90%), while much effort is needed to solve the remaining few problems. At least, the crud operations that occupy the vast majority in the data access layer, by using the ORM framework, we only need to spend a very small amount of time and effort t

, however, it is a good embodiment of the "80/20 (or 90/10) Law" (also known as the "Pareto Law"), that is: less flowers (10%-20%) the effort can solve most of the problems (80%-90%), while much effort is needed to solve the remaining few problems. At least, the crud operations that occupy the vast majority in the data access layer, by using the ORM framework, we only need to spend a very small amount of time and effort to solve them. This undoubtedly shortens the entire project development cycl

Database Structure Design and how to maximize the use of indexes and database Indexes For example, a message table The structure is as follows: Id (auto-incrementing primary key) Content (Content) UserId (speaker Id) IsWonderful (whether it is a brilliant speech) Top (whether it is set to the Top) IsBarrage (whether it is a bullet screen) When the table data i

Three paradigms: 1st specification: there are no repeated groups or multi-value columns, which is the minimum requirement for database design. 2nd specification: each non-Keyword segment must depend on the primary keyword and cannot depend on some components of a combined primary keyword. Eliminate part of the dependency. In most cases, the database

In-depth understanding of database design and database 　　　　　As the saying goes: "Let's review the previous knowledge points. New knowledge can be used as a teacher! 　　　　 01. What are common Aggregate functions?Avg (): calculates the average value.Sum (): SumMax (); returns the maximum value.Min (): Minimum valueCount (): calculates the total number of records. co

Data Center reconstruction-Database Design-Data Center reconstruction Database I. Draw an ERTU A E-R Diagram, also known as an Entity Relationship divisor, provides a way to represent Entity types, attributes, and associations to describe the conceptual models of the real world. Drawing Method: (1) determine all entity sets (2) Select the attributes that the obje

However, in the project I have experienced, some of the database design will have some problems, especially the following will be described in this two points, the individual feel that should be avoided misunderstanding, summed up to discuss with you. One of the pitfalls. Alternate field Description of the phenomenon: In a datasheet, you not only design the fi

Data Engine Tuning Advisor is one of the database performance tuning tools provided by sqlserver. Let's take a look at how to use this tool to optimize database design. Database Engine Tuning Advisor Tuning Recommend the best mix of indexes for databases by using the query optimizer to analyze queries in a worklo

Ylbtech-DatabaseDesgin: Microsoft officially provides-Northwind (e-commerce)-Database Design 1.a, database relationship. b. Database Design script (the remarks for this script are described below according to some materials. If any errors are caused, I hope to correct them.

Label:Do more than the MIS system, a long time ago this idea, want to put the MIS system user rightsManagement and approval flow management stand-alone, separate componentsToday, for the time being, look at the database table design of the Authority management system.subsystem table, because I design here in order to be able to integrate all the internal system o

Data Center reconstruction-database design, data center reconstruction Database Database Design-conceptual design stage This phase mainly draws an erdiagram based on requirements, as shown in the following figure. The diagram sh

Database Table Design for Mysql optimization and database table Optimization for mysql Separation of Fixed Length and Variable Length Separation of common and uncommon Columns For example: This table is not good enough and can be optimized. Analysis: Except the username/intro column, each column in this table is fixed. We may wish to set the length of a

One, the distinction of the concept Some people confuse object-oriented database design (i.e. database schema) with object-oriented database management system (OODBMS) theory. In fact, the former is a database user-defined database