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When you initially create a database, your new database includes several built-in schemas. You can also add schemas and assign ownership for the new schemas in multiple ways. This section traces the schemas in a database from its initial creation and through various actions for creating a schema and transferring the ownership of the schema among database users and a database role. The sample scripts covered in this section appear in OwningSchemas.sql. The following script creates a new database (NewDB2), as well as the schemas in the database, which will set up a baseline that will help you track the ownership of schemas in a database. After changing the database context to the new database, a SELECT statement returns the schema_id, schema name, and owning principal_id of each schema in the database from sys.schemas along with the name of the principal owning a schema from sys.database_principals. USE master GO IF EXISTS(SELECT * FROM sys.databases WHERE name = 'NewDB2') DROP DATABASE NewDB2 GO CREATE DATABASE NewDB2 GO USE NewDB2 GO SELECT s.schema_id, s.name 'Schema name', s.principal_id, dp.name 'Principal name' FROM sys.schemas s RIGHT JOIN sys.database_principals dp ON s.principal_id = dp.principal_id WHERE dp.is_fixed_role = 0 AND dp.name <> 'public' The following listing shows the result set from the preceding SELECT statement. The four rows in this result set document the four built-in schemas for a new database. The Schema name column shows the names of the built-in schemas, and the Principal name column shows the principal that owns each built-in schema. The principal_id column is an identification number for the principal owner.

Figure 11-43. Checking whether a value is a number and finding out it is not 2. This second example places numbers and spaces into a char field. The ISNUMERIC() test ignores the spaces, provided that there are no further alphanumeric characters. DECLARE @IsNum char(10) SET @IsNum = '1234 ' SELECT ISNUMERIC(@IsNum) Figure 11-44 shows the results of running this code.

USE AdventureWorks GO SELECT ROW_NUMBER() OVER(PARTITION BY SUBSTRING(LastName,1,1) ORDER BY LastName) AS RowNum, FirstName + ' ' + LastName FROM HumanResources.vEmployee WHERE JobTitle = 'Production Technician - WC60' ORDER BY LastName When we execute the code, as the first letter of the last name alters, we see the RowNum column, which contains the value for ROW_NUMBER() alter, as shown in Figure 12-7.

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The INFORMATION_SCHEMA and sys schemas make available built-in views of system data. The Processing Meta Data with System Views section in 7 introduces you to using these views. Although the dbo and guest users own the schemas named after them, these schemas are available for use by any database user. For example, you can even designate the guest schema as the default schema for a new user (see Creating Users for a sample demonstrating this). schema_id ----------1 2 3 4 Schema name -----------------dbo guest INFORMATION_SCHEMA sys principal_id -----------1 2 3 4 Principal name -------------------dbo guest INFORMATION_SCHEMA sys

Before we look at handling errors, you need to be aware of what an error is, how it is generated, the information it generates, and how to generate your own errors when something is wrong. The T-SQL command RAISERROR allows us as developers to have the ability to produce our own SQL Server error messages when running queries or stored procedures. We are not tied to just using error messages that come with SQL Server; we can set up our own messages and our own level of severity for those messages. It is also possible to determine whether the message is recorded in the Windows error log or not. However, whether we wish to use our own error message or a system error message, we can still generate an error message from SQL Server as if SQL Server itself raised it. Enterprise environments typically experience the same errors on repeated occasions, since they employ SQL Server in very specific ways depending on their business model. With this in mind, attention to employing RAISERROR can have big benefits by providing more meaningful feedback as well as suggested solutions for users.

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