er diagram for movie database

Label:er diagram The E-r graph, also known as the entity-contact graph (Entities Relationship Diagram), provides methods for representing entity types, attributes, and connections to describe the conceptual model of the real world. Entity is to see the touch or can be perceived acceptance of the objective existence, the attribute is used to describe the entity, contact nature is the relationship between ent

Label:Today, Azusa brother asked me to first design a database table for the project, it is best to draw an ER diagram out. Er diagram I know what, because before the database and application of the water class,, but now forget al

Visio 2010 Reverse-Engineering The MySQL database build ER Database model diagram1, first need to download from MySQL for database link drive ODBCYes: http://dev.mysql.com/downloads/connector/odbc/Download it according to the appropriate version and install it locally after downloading2, start Visio2010 (other version

directionality, and there is a cardinality in each direction.ExampleThe link between "department" and "student" two entities is a one-to-many connection, in other words the link between "student" and "department" is a multi-pair connection. And a student must belong to a department, and can only belong to a department, can not belong to 0 departments, so from the "student" entity to "department" the base of the entity is "a", from the other side of the contact to consider, a department can have

%.] Sys.columns Cjoin [%catalog%.] Sys.objects o on (o.object_id = c.object_id)join [%catalog%.] Sys.schemas u on (u.schema_id = o.schema_id)join [%catalog%.] Sys.types T on (t.user_type_id = c.system_type_id)Left outer join[%catalog%.] Sys.identity_columns i on (i.object_id = c.object_id andi.column_id = c.column_id)Left outer join[%catalog%.] Sys.default_constraints D on (d.object_id = c.default_object_id)whereO.type in (' U ', ' S ', ' V ')[and U.name =%.q:owner%][and O.name=%.q:table%]ORDER

redundancy, update exception, insert exception, delete exception)3NF: The non-primary attribute is directly dependent on the candidate key. (non-conforming data redundancy, update exception, insert exception, delete exception)BCNF: A non-primary property directly depends entirely on the candidate key, and the primary attribute is directly full function dependent on the key that does not contain it.The database design can be divided into three steps:1

database--the method of transforming from ER diagram to relational mapping Specific steps: 1.For each strong entity type E. Create a new table. Include as its columns, all the simple attributes and easy components of the composite attributes of E. Identify the PRI Mary Key and the alternate keys. Do not include any multi-valued attribute as a key. If The unique

Images cannot be copied directly. You can fill it up later. 1. Open PowerDesigner, select File | Reverse Engineer | Database ..... in the new Physical Data Model dialog box, select the type of database you want to connect to, and click OK. 2. In the Database Reverse Engineering window, select the Using a data source option. Click the

digits ( case when a.isnullable=1Then'√'ELSE"'END) allow null, ISNULL (E.text,"') Default value, ISNULL (G.[value],"'As field description from syscolumns a left JOIN systypes b on A.xtype=b.xusertype INNER JOIN sysobjects D on a.id=D.id and D.xtype='U'and D.name'dtproperties'Left JOIN syscomments e on A.cdefault=E.id left JOIN sys.extended_properties g on a.ID=g.major_id and A.colid=g.major_id ORDER by a.id, A.colorder Next, export the data dictionary: First, click Export in the top right co

the direction of the link, generally with a verb or a dynamic table.For example, the "Students to subject" group box should be filled in with "owning", and "belong" in the "Lessons to student" group box. (Here is just an example, maybe some words are not very reasonable).Vii. Mandatory definition of linkagesMandatory the mandatory relationship between the form and this direction. Select this check box to create a vertical line of contact lines on the contact line. Not selecting this check box i

improved a lot and learning is not as objective as it was before. Thank you! Stick to the tomato template to make your efficiency more and more efficient! Come On! Database optimization (ER Model Design) If you are the boss of your company, this design can quickly query the required information. However, if you manage it yourself, I think, combine the "Contact" and "Contact Unit" into a table and change

How Visio can reverse-connect a database to generate an ER diagram (that is, automatically generate ER diagrams from a database) In the use of the author, there is an automatic generation of ER graph requirements. After a while,

include a master's degree, a doctor, a bachelor's degree, and so on. Operations on the ER model are actually operations on the ER model elements, that is, operations on entities, connections, and properties, the purpose of the operation is to achieve user requirements while reducing data redundancy. 2 conversion from ER model to Relational Model The transfor

Label:we need to consider the relationship between the data when we set up the database, in order to clarify the relationship between the data we need to do a uniform collation of the data. For the more complex database, we need to establish a database model, which can be divided into two steps: first, the structure analysis of the

In the painting ER diagram when looking for a more useful and professional point of the tool, looking for a half-day finally chose the seemingly less professional EA to draw ER diagram Briefly explain how the EA is implemented to draw ER graphs First, the Operation proc

the box. For the primary property name, underline it under its name. Connections: Between entities and attributes, between entities and relationships, between contacts and attributes, and by a straight line, and by marking the type of contact on a line. (For one-to-many connections, write 1 on the two-entity connection direction; On one side write 1, many of the parties write n; for many-to-many relationships, write n,m in the direction of two entity lines. ) First , we want to use the shape o

Tags: c style blog A HTTP extin the design of the database, think of the exact installation EA software, see if I can use it. EA painting ER model. The results show that not only can draw, but also the entire database design (Generate SQL script). below to the computer room toll system users -- students as an example. Students can view the balance, can view the

database. Through the menu bar "Databas" e--> "Connect to Database", enter the corresponding hostname, port, username, password, and connect successfully;After the successful connection, you can see the monitoring information, as well as the database tables;2.2 Through the menu bar "Database", select "Reverse Engineer

To draw an ER diagram with Visio The 3 elements of an ER diagram are entities, attributes, and relationships. When we learn the base of the database, the general ER diagram looks like

workflow of the application unit and develop the project development plan. (2) Demand analysis: Accurate understanding and analysis of user needs. The tasks required in the requirements analysis phase are: A. Analyze user activity and generate business flowchart. B. Determine the system scope and generate a system correlation diagram. C. Analyze the data involved in user activity and generate a streaming diagram