- Select Database In Mysql Workbench
- Mysql Workbench Select Database Sql
- Mysql Workbench No Database Selected
DDL AND DML
SQL statements are divided into two major categories: data definition language (DDL) and data manipulation language (DML).
Data definition language (DDL)
If you connect to a MySQL Server via the MySQL Workbench application, you can select a database when you create the database connection as shown in the screenshot below: Once you logged in, you can select another database by issuing the USE statement or use the Set As Default Schema feature provided by MySQL Workbench. Query MySQL Data. Open the connection you just created (CData SQL Gateway for MySQL). Click File - New Query Tab. Write a SQL query to retrieve MySQL data, like SELECT. FROM `CData MySQL Sys`.Orders; With access to live MySQL data from MySQL Workbench, you can easily query and update MySQL, just like you would a MySQL database.
DDL statements are used to build and modify the structure of your tables and other objects in the database.
- CREATE - to create objects in the database
- ALTER - alters the structure of the database
- DROP - delete objects from the database
- TRUNCATE - remove all records from a table, including all spaces allocated for the records are removed
Data Manipulation Language (DML)
![Select Select](https://static.macupdate.com/screenshots/240410/m/mysql-workbench-screenshot.png?v=1594813284)
Select Database In Mysql Workbench
Data Manipulation Language (DML) statements are used for managing data within schema objects. Some examples:
- SELECT - retrieve data from the a database
- INSERT - insert data into a table
- UPDATE - updates existing data within a table
- DELETE - deletes all records from a table, the space for the records remain
- MERGE - UPSERT operation (insert or update)
The SQL SELECT Statement
The SELECT statement is used to select data from a database.
The result is stored in a result table, called the result-set. Steermouse 5 3 77.
SQL SELECT Syntax 1
SELECT Example
In the following example we ask for the 'title', 'author' and 'isbn' of all the registers of the table 'books'. Notice that SQL is not case sensitive. We can write SQL both in upper case or lower case.
SQL SELECT Syntax 2
and
The * means we are asking for all the columns of the table.
SELECT * FROM Clause Example
Below we can see the result of the SELECT * FROM eli.publisher; all the information of the table 'publisher';
Notice we are using indistinctly the command line interface and the workbench. It is important you get familiar with the command line interface, so that you can use it if you need to.
The SQL WHERE Clause
The WHERE clause is used to extract only those records that fulfill a specified criterion. It works as a filter.
SQL WHERE Syntax
WHERE Clause Example
In this example we are asking for all the registers of the table 'books' which have as an 'idpublisher'=1. Only if this condition is true we are getting a result;
The SQL ORDER BY Keyword
The ORDER BY keyword is used to sort the result-set by one or more columns.
The ORDER BY keyword sorts the records in ascending order by default. To sort the records in a descending order, you can use the DESC keyword.
SQL ORDER BY Syntax
ORDER BY Clause Example
![Mysql Workbench Select Database Mysql Workbench Select Database](https://dev.mysql.com/doc/workbench/en/images/wb-navigator-data-export-object.png)
In this example we are organizing the table 'books' by the 'title' in alphabetical order;
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This artcle will show you how to create a diagram for existing MySQL or MariaDB database using MySQL Workbench.
Reverse engineer a database
To create a diagram from existing database you need to use reverse engineering functionality to create a model.
Mysql Workbench Select Database Sql
To reverse engineer database go to menu Database and choose Reverse Engineer.. option.
Provide connection details to your database and click Next. Wait for the connection and click Next again.
When successfully connected wizard will show you list of available schemas on the server. Select the ones you want to reverse engineer.
Wait for the schemas being read and continue with Next. On next screen you have an option to select object types and filter specific objects. Let's ignore it and import all objects. Click Execute >.
Wait for reverse engineering to take place and when done continue with Next. Final screen shows you a summary of the import. Close with Finish.
Default diagram
When the process ends with success you get a new model (more about models here) with default diagram with all tables and views.
Clean out diagram
What you probably want to do right after you created a default diagram is to remove unnecessary tables and views and arrange tables to make it easier to grasp.
To remove table from diagram select it, right click and choose Remove Figure option. Menutab for facebook 6 4.
Be careful not to choose Delete option as it will remove table not only form diagram but also your model catalog. Without a warning!
Arrange tables
To arrange tables you can try autoarrange option, but you'll need some manual work on top of that.
To use autoarrange go to menu, select Arrange and Autolayout.
To manually arrange tables simply select them and move around when you feel they fit best. Good luck.
Save model
Once you have completed your diagram make sure to save it. It is saved in a MySQL Workbench model in a .mwb file in Documents folder.
Export diagram
When your diagram is complete and safe it you can export it to png, pdf, ps or svg.
To export diagram go to menu, select File, then Export, select one of the available formats and provide folder and filename.
Here is my diagram:
See it in other formats:
A better way to share diagrams: Dataedo
There is a better way to create and share diagrams for existing databases - Dataedo. Here is a sample export of complete database documentation with diagrams:
A few of the benefits:
Mysql Workbench No Database Selected
- Easy and convenient sharing in interactive HTML
- Draw diagrams for databases with no FK constraints
- Attach complete data dicionary