Database Knowledge Review

1. Http://www.newasp.net/soft/30867.html#downloads Win7 64-bit. sqlserver2008

2. Installation

   Http://www.cnblogs.com/lyhabc/articles/3536047.html

3. Open it

4. Landing

   Super User: sa password: 123456

   The following diagram is a database separation.

5. Database knowledge

High efficiency of XML database query

Integrity constraints: Constraints on data.

User-defined integrity: Male, female or female. Referential integrity: Reference. Referential entity integrity between relationships and relationships: identifiers cannot be empty, and so on.

Semantics-based requirements.

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Relationship operation: Adding and deleting changes

Select projection (check)

Connect the equivalent connection (on the basis of the Cartesian product (behavior multiplication, column plus) to select the operation)

Natural connection (projection operation on the basis of equivalent connections)

General Connection

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Data type

Do not calculate, varchar (variable)

To calculate, int float, etc.

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Select * Form stu,major + where xxx.xx = xxx.xx

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We can add scripts to our newly created files, or we can create tables, databases, etc. through scripting.

General database files can be saved in the default place of the system

Native database File save location: C:\Program Files\Microsoft SQL Server\mssql10_50.sqlexpress\mssql\data

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Transactions: A number of operations are bundled together.

The operation of the die.

Transfer operation: One fetch, one deposit. Two operations are performed simultaneously.

Rollback mechanism. You need to spit it out in the food.

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Paradigm: The first paradigm must be a relationship. The following is a supplement to the first paradigm.

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1. Java Object-oriented programming

   Virtual machines: Cross-platform

   Javase: Desktop application development

   Java EE: server-side enterprise-level development

   Induction "Abstract" "Class

Database Knowledge Review