A Guide to the SQL Standard by C. J. Date

By C. J. Date

The former version of this e-book validated itself because the so much whole and comprehensible therapy of the SQL typical commonly to be had. Many alterations have happened within the SQL criteria international seeing that that version used to be released, in spite of the fact that: a huge new part, the Call-Level Interface (SQL/CLI), was once further in 1995. one other significant new part, the continual saved Modules function (SQL/PSM), is nearing finishing touch and is because of be additional to the traditional in overdue 1996 or early 1997. the unique 1992 normal itself has been considerably replaced and corrected throughout the e-book of 2 large Technical Corrigenda, one in 1994 and one in 1996. All of those adjustments are mirrored during this Fourth version. previous variants of this ebook tested a practice of cautious, transparent, and actual clarification of complicated technical fabric. This re-creation keeps that culture.

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The T-SQL object you choose to create will depend on how you intend to use it. A common question revolves around when to use a stored procedure and when to use a user-defined function. There are several things to consider, but you can boil them down to these few issues: 26 ❑ Are you going to perform any Data Manipulation Language (DML actions like UPDATE, DELETE, or SELECT INTO? What about Data Definition Language (DDL) statements? If so, use stored procedures, because these actions are not allowed in user-defined functions.

Click the link titled Surface Area Configuration for Features. The tool will examine any SQL Server instances on the local host or a selected remote host to determine which features are available within each instance. If you have installed SQLEXPRESS, Navigate to this instance, find the feature named CLR integration, and click the check box to Enable CLR Integration. If you are using a server installation of SQL Server, navigate to that server instance instead. While you are here, notice the other features in the Surface Area tool that are not activated by default, most notably xp_CmdShell, which we will discuss later.

There are three default permission sets you can assign to your assemblies upon loading them into SQL Server (see Chapter 8 for more details): ❑ SAFE indicates that computational or string algorithms as well as local data access is permitted. ❑ EXTERNAL_ACCESS inherits all permissions from SAFE plus the ability to access files, networks, registry, and environmental variables. ❑ UNSAFE is the same as EXTERNAL_ACCESS without some of its restrictions and includes the ability to call unmanaged code.

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