create er diagram from sql

in both tables as foreign keys. As shown in the following: using Visio to draw the ER diagram basic steps have been introduced, in the use of Visio modeling must be careful, in the pre-drawing must be analyzed for each entity and entity attributes of the naming conventions. The above method is the use of graphical tools to create their own

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 computer record, can view the status of the c

1. Enter Tools-->execute commands-->edit/run script, execute the following scripts to achieve all the fields to capitalize;Option ExplicitValidationmode = TrueInteractivemode = Im_batchDim MDL ' current model' Get current modelSet mdl = ActivemodelIf (MDL is Nothing) thenMsgBox "Not open a model"ElseIf not MDL. IsKindOf (Pdpdm.cls_model) ThenMsgBox "The current model is not a PDM"Else' Call handlerProcessFolder MDLEnd If' handler calledPrivate Sub ProcessFolder (folder)Dim Tab ' table to be proc

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

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

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

Tags: des http io ar os for SP Strong onError:When click 'New Database Diagram', a error popped up and said 'attempted to read or write protected memory. This is often a indication that other memory is corrupt. (Microsoft.VisualStudio.OLE.Interop)"Related Link:https://social.msdn.microsoft.com/Forums/en-US/fa9df00f-49ba-4345-b036-423ae30a5d47/ problem-to-create-new-database-

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

break the column by using the database properties----definition----Check the columns associated with each other in the two tables----disconnect, or use this method to join the columns in both tables as foreign keys. As shown in the following: Using Visio to draw the ER diagram basic steps have been introduced, in the use of Visio modeling must be careful, in the pre-drawing must be analyzed for each enti

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

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

%.] 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

, credits), and make a second differential backup of the Student database, back up to the backup device bk_Student In 2.(2) Delete Student Database(3) Recovering a database① Restore the Student database from the backup device bk_ Student0 and see if the table Temp1 and Temp2 exist?② Delete the database Studentagain, and then restore the Student database to the state after the first differential backup, andSee if tables Temp1 and Temp2 exist?③ Delete the database Studentagain, then restore the St

Objective: To explain in detail how to create a SSIS package I have bought a Pirated Windows 2003 operating system CD, which comes with a very detailed graphic introduction, that is, the system installation diagram of the dumb version. Therefore, this article is intended to be explained in that way. In this way, you will have an overall understanding of how to make your own SSIS package according to the fol

The scheduling task of using SQL can handle some special environment data, in addition to using the Windows system scheduled tasks to handle the time, but to cooperate with the program, some things can directly use the SQL itself to schedule tasks, more convenient, so this article illustrates the SQL2005 planning task creation use. The specific steps for creating a scheduled task in

Rose was first used, and EA was used for UML design, which was very convenient. EA, that is, sparx systems enterprise effecect. EA provides users with a high-performance and intuitive working interface, and works with the latest UML 2.0 specifications to create advanced software modeling solutions for desktop computer staff, Development and Application teams. This product is rich in features and highly cost-effective. It can be used to equip your enti

box: In Data source, select the Third radio button, Connection profile: Then click Configure. The following window will pop up: Select Add Data Source in the upper-left corner to bring up the following window: And then started to set up, basic press to set, the first is the name, random take, the second is to save the location of the configuration file, put the work space on the line; The third is a description, no tube; the fourth is the connection type; The fifth is the database type; si

The key to performance optimization is to find the right direction, for example, for a PL/SQL code, we think it is slow to execute, but in the end it needs a measurable tool to analyze, and we sometimes like to leave debug code in it, like using dbms_utility.get_ Time is spent on the execution of the statement, which can be cumbersome if the code is large.PL/SQL Developer provides this functionality, as des

]#!PDP ')];To create a table for the user, and permissions, but partial authorization, can also be fully authorized, here all authorized to the tableMysql> CREATE DATABASE Tb_newusrtb;mysql> grant all privileges on tb_newusrtb.* to [e-mail protected] identified by ' [Email PROTECTED]#!PDP ';mysql> flush privileges;At this point, the task is complete, log in to the database with the new userUse the command t

I've known for a long time that Microsoft's PetShop is very classic, yesterday took time to learn, at first really did not adapt to, what membership, really do not understand, run PetShop want to learn from the landing, but the user name and password are not known, and later found that there are more registered pages, I registered a page, only to find out from the database. It took so much time to finally go back to the database, but a table in the database of one of the tables can not find the