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Dimensions provide context for facts Without context, facts are impossible to interpret For example, I might tell you, Order dollars are $40,000 This statement is of no use to you It presents a fact (order dollars) without any explanation Is this orders for one product or all products Is it one day s worth of orders or one year s To understand what $40,000 means, you need more information Order dollars were $40,000 for electronic products in January 2009 By adding dimensional context a product category, a month, and a year the fact has been made useful As you saw in 1, dimensions and their values add meaning in many ways: They are used to filter queries or reports They are used to control the scope of aggregation for facts They are used to order or sort information They accompany facts to provide context on reports.

to the database server. To create a SQL Server login based on a Windows NT user or group in Enterprise Manager, do the following: 1. Select the server for which you want to create a login. Expand the Security folder. Right-click Logins and select New Login. You will see this dialog box:

Here is an example of a valid query using DB2 dates, assuming that the HIREDATE column contains DATE data: SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE >= '05/30/1989' + 15 DAYS SQL Server provides a single date/time data type, called DATETIME, which closely resembles the DB2 TIMESTAMP data type If HIRE_DATE contained DATETIME data, SQL Server could accept this version of the query (without the date arithmetic): SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE >= '06/14/1989' Since no specific time on June 14, 1989, is specified in the query, SQL Server defaults to midnight on that date.

They are used to define master detail organization, grouping, subtotaling, and summarization Put to these uses, dimensions unlock the value of facts Dimensions can be added to queries in different combinations to answer a wide variety of questions The larger the set of dimension attributes, the more ways that facts can be analyzed TIP Provide a rich and comprehensive set of dimension attributes Each new attribute dramatically increases the number of analytic possibilities Dimension tables with a large number of attributes maximize analytic value They can be thought of as wide If you listed their contents, each row would be quite long In addition to storing common attributes, dimension tables store commonly used combinations of attributes Codes may be supplemented with corresponding description values Flags are translated from Boolean values into descriptive text, and multi-part fields are both preserved and broken down into constituent pieces.

2. In the Name field, specify a unique name for the new login. This is the name a user must use to connect to the database server. 3. For Authentication, select SQL Server Authentication and enter a password to be used by a user or application to log in to the database. 4. Specify a default database to which the user will connect. Note that you may need to grant database permissions (described later) separately. 5. Click OK and then verify the password to create the new login. You can optionally specify server roles and database roles using the other tabs in this dialog box (described later). SQL Server login information is stored in the syslogins system table (located in the master database). Password information stored in this table is encrypted. When a user attempts to authenticate, SQL Server verifies whether a login and password are present in this table, and if so, allows the login.

It is also important not to overlook numeric attributes that can serve as dimensions..

The SQL Server query thus really means: SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE >= '06/14/1989 12:00AM' If a salesperson's hire date was stored in the database as midday on June 14, 1989, the salesperson would not be included in the SQL Server query results but would have been included in the DB2 results (because only the date would be stored) SQL Server also supports date arithmetic through a set of built-in functions Thus the DB2-style query can also be specified in this way: SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE >= DATEADD(DAY, 15, '05/30/1989') which, of course, is considerably different from the DB2 syntax Oracle also supports date/time data, with a single data type called DATE Like SQL Server's DATETIME type, an Oracle DATE is, in fact, a timestamp.

When administering user permissions in a network environment, maintaining logins at both the network operating system level and at the database level can be tedious, time-consuming, and error-prone. Windows NT accounts (groups and users) can be directly granted permissions to access a Microsoft SQL Server database if you re using