database table field

In the course of doing the project today, I encountered a problem with the title, such as:The database uses the SQL Server2012 version, and the script to create the table is as follows:CREATE TABLE [dbo]. [Type]([TypeId] INT not NULL PRIMARY

Original: SQL Server garbled after inserting Chinese dataIn the course of doing the project today, I encountered a problem with the title, such as:The database uses the SQL Server2012 version, and the script to create the table is as follows:CREATE

short and not cut1NF: field is not divided;2NF: Primary key, non-primary key field depends on primary key;3NF: Non-primary key fields cannot depend on each other;Explain:1NF: Atomic field can not be re-divided, otherwise it is not a relational

What is a database? A database is a warehouse that organizes, stores, and manages data according to its structure, and each database has one or more different APIs for creatingTo build, access, manage, search, and replicate saved data.We can also

In order to build a database with small redundancy and reasonable structure, we must follow certain rules when designing database. In a relational database, this rule is called a paradigm. A paradigm is a summary of a design requirement. In order to

First paradigm: Ensure the atomicity of each column.if each column (or each attribute) is the smallest data unit (also known as the smallest atomic unit) that is not re-divided, the first normal form is satisfied. For example: Customer table (name,

In order to build a database with small redundancy and reasonable structure, we must follow certain rules when designing database. In a relational database, this rule is called a paradigm. A paradigm is a summary of a design requirement. In order to

In order to build a database with small redundancy and reasonable structure, we must follow certain rules when designing database. In a relational database, this rule is called a paradigm. A paradigm is a summary of a design requirement. In order to

The most recent mistake in making a project is a rather odd question:The code was directly checkout from SVN, and the database was directly dump from someone else's machine. After the environment is properly configured, it is not possible to place

Http://www.cnblogs.com/linjiqin/archive/2012/04/01/2428695.htmlIn order to build a database with small redundancy and reasonable structure, we must follow certain rules when designing database. In a relational database, this rule is called a

Three paradigms of database designIn order to build a database with small redundancy and reasonable structure, we must follow certain rules when designing database. In a relational database, this rule is called a paradigm. A paradigm is a summary of

In the classic JDBC usage, is the SQL parameter used as a placeholder? and is subject to location restrictions. The problem with locating parameters is that once the order of the parameters changes, the parameter bindings must be changed. In the

In order to build a database with small redundancy and reasonable structure, we must follow certain rules when designing database. In a relational database, this rule is called a paradigm. A paradigm is a summary of a design requirement. In order to

Note: This article as a learning material, only for reference!Why do I need an indexThe data is stored as a block on disk. To ensure atomicity of the disk operation, all data blocks are accessed when the data is accessed. These blocks of data on

When a database is logged using Adoquery in Delphi, it is sometimes reported that the row cannot be positioned for updates. Some values may have been changed since the last read "this error." This error is usually the record of your operation has

MySQL table and field encoding format errorFirst, database, table, field encoding format are Latin1 (iso-8859-1). When the data is saved to the database, the Chinese display is garbled.Workaround:1. Add the encoding format to the Access database

1. List the number of employees and department numbers in each department with wages higher than the department's average salary, sorted by department numberSelect A.deptid, COUNT (*) from employee921 as a INNER JOIN(Select DeptID, AVG (Salary) as

In order to build a database with small redundancy and reasonable structure, we must follow certain rules when designing database. In a relational database, this rule is called a paradigm. A paradigm is a summary of a design requirement. In order to

General installation of the MySQL program process, there is a step to choose MySQL default encoding format, Cheng think Latin1 encoding format, of course, you can choose the third option, manually select GBK or UTF8 encoding format to support

SQL statements can be divided into three categories: DDL, DML, DCL, subdivision can also be divided into six categories: DDL, DML, DQL, TPL, DCL, DCL, CCL. Different distributions are just different granularity of the classification.Here's a