Getting Started with IBM Data Studio for DB2

86 Getting Started with IBM Data Studio for DB2
2.4.4 Creating views
Views provide another way of representing the data that exists in the tables of a database.
Views don’t contain the data, but they allow you to writeSELECT andJOIN statements to
represent data stored in tables without exposing the details of how the data is actually
structured. You can use a view to select an entire table, join together multiple tables, or
omit specific columns as a way to restrict access to the data.
To create a view of columns in a single table or in multiple tables:
1. Right-click the Views folder in the Administration Explorer and select Create View. You
must select the schema in which to create the view. SelectMYSCHEMA and click OK.
The Properties view will display the attributes of the new view, as shown in Figure 2.19.
2.19 – Defining a new view
2. In the General tab, specify the name of the view,MYVIEW.
3. In the SQL tab, define the columns for this view, using an SQL query. Type the
following query in the Expression field to select theEMP_ID andADDRESS columns
fromMYTABLE:
SELECT "EMP_ID", "ADDRESS" FROM "MYSCHEMA"."MYTABLE"
4. Click Update to update your view definition.
In the planned changes bar of the object list editor, you see the count of new and changed
objects updated to include the new view. In the next section, you will deploy the new view
to the database, along with the other objects in the change plan.
2.4.5 Deploying multiple changes with a change plan
In the previous sections, you created a set of changes to a database in a change plan. A
change plan groups multiple related changes together and allows you to deploy them in a
single step. This section will show you how to deploy the changes to the database.
To deploy the change plan to the database:
1. In the object list editor, review the number of new and changed objects by clicking the
delta icon. Then, click the Review and Deploy Changes button, shown in Figure 2.20.
Data Studio opens the Review and Deploy window, with a preview of the commands
that will be used to deploy the changes to the database.