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There are three sets of topics that you need to grasp when working with permissions. You have to learn about the different kinds of permissions. These can range from granular ones, such as permission to read an individual table, to coarse ones, such as permissions to perform any task on a database server. Next, you have to learn how to assign permissions to a principal. There are different approaches depending on the type of principal and granularity of the permission that you want to assign. Finally, it is very helpful to be able to explore the permissions that belong to principals. This helps you to assess whether existing permissions meet your current and likely future database security requirements.

To find the difference between two dates, you would use the function DATEDIFF(). The syntax for this function is DATEDIFF(datepart, startdate, enddate) The first option contains the same options as for DATEADD(), and startdate and enddate are the two days you wish to compare. A negative number shows that the enddate is before the startdate.

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1. The first example will try and divide 100 by zero, which is an error. We will then list out the error number, and then again list out the error number. Enter the following code and execute it: SELECT 100/0 SELECT @@ERROR SELECT @@ERROR 2. It is necessary in this instance to check both the Results and Messages tab. The first tab is the Messages tab, which will show you the error that encountered. As expected, we see the Divide by zero error. Msg 8134, Level 16, State 1, Line 1 Divide by zero error encountered. (1 row(s) affected) (1 row(s) affected) 3. Moving to the Results tab, you should see three result sets, as shown in Figure 11-45. The first, showing no information, would be where SQL Server would have put the division results, had it succeeded. The second result set is the number from the first SELECT @@ERROR. Notice the number corresponds to the msg number found in the messages tab. The third result set shows a value of 0. This is because the first SELECT @@ERROR worked successfully and therefore set the system variable to 0. This demonstrates the lifetime of the value within @@ERROR.

There are two popular ways to assign permissions to principals One way is to assign permissions directly to principals This technique works best for a small group of users that require distinctly different permissions In addition, the administrative burden of this approach is least when there is relatively little turnover among group members, and the number of permissions you need to manage per principal is relatively small Another approach to managing permissions is to assign a principal to a role You can use either fixed roles, such as fixed server roles and fixed database roles, or custom roles In either case, the principal inherits the permissions of the role to which you assign it.

Try It Out: DATEDIFF()

Figure 11-45. Showing @@ERROR in multiple statements 4. When we use the RAISERROR function, it will also set the @@ERROR variable, as we can see in the following code. However, the value will be set to 0 using our preceding example. This is because the severity level was below 11. RAISERROR (50001,1,1,243) SELECT @@ERROR 5. When the code is executed, you can see that @@ERROR is set to 0, as shown in Figure 11-46.

This second approach is easier to administer than the first approach as the number of users grows large, turnover among users grows large, and the number and types of permissions you are managing per principal becomes either large or complex Just as with principals and securables, there is a permission hierarchy One especially useful source for exploring the permission hierarchy is the sysfn_builtin_permissions system catalog view This view can return a description for any individual permission in the permission hierarchy, which is the set of all permissions that you can assign to a principal with T-SQL When you run a SELECT statement for the view, you must specify a securable class as an argument See ShowingPermissionssql for samples demonstrating the use of sysfn_builtin_permissions When you run a SELECT statement for sys.

We will set two local variables to a date and time. After that, we find the difference in milliseconds. DECLARE @FirstTime datetime, @SecondTime datetime SET @FirstTime = '24 March 2008 3:00 PM' SET @SecondTime = '24 March 2008 3:33PM' SELECT DATEDIFF(ms,@FirstTime,@SecondTime)

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