Most of the articles that I presented so far for database development have been centered around the exact Microsoft T-SQL syntax to perform a certain operation. At the University of Rhode Island, I learnt how to program in Pascal before typing in my first ANSI SQL statement. In short, I will always be some type of developer in my heart. However, many people do not come from a computer science and math background. The SQL Server Management Studio (SSMS) has menus and dialog boxes to achieve many of the same…
Category: Database Developer
Articles related to developing TSQL code for SQL Server 2008 R2.
Instead of Update
Today, I will be looking at how INSTEAD OF TRIGGERS can be used to make our VIEW correctly work with a UPDATE statement. I will be using the [AUTOS] sample database for this demonstration. The [VW_JOIN_MAKES_2_MODELS] view will be enhanced with a instead of trigger so that update action can be perform on two tables at the same time. The enclosed script has code to perform the following actions in the AUTOS database. 5A – Remove aggregate view 5B – Reload tables with good data 5C – Create a instead…
Instead of Delete
Today, I will be looking at how INSTEAD OF TRIGGERS can be used to make our VIEW correctly work with a DELETE statement. I will be using the [AUTOS] sample database for this demonstration. The [VW_JOIN_MAKES_2_MODELS] view will be enhanced with a instead of trigger so that delete action can be perform on two tables at the same time. The enclosed script has code to perform the following actions in the AUTOS database. 5A – Remove aggregate view 5B – Reload tables with good data 5C – Create a instead…
Instead of Insert
Most information technology professionals do not know that data can be modified via a VIEW. The INSERT, UPDATE, and DELETE statements of the Data Manipulation Language (DML) can be executed on a view as long as the following set of rules are adhered to. Modifications must reference columns from only one base table. The columns must directly reference the underlying data table. I am going to continue my exploration of updatable views. Last time, we were using the [AUTOS] sample database and discovered that DELETE statements were not working the…
User Defined Views – Part 4
Most information technology professionals do not know that data can be modified thru a VIEW. The insert, update, and delete statements, Data Manipulation Language (DML), can be executed on a view as long as the following set of rules are adhered to. Modifications must reference columns from only one base table. The columns must directly reference the underlying data table. Today, I am going to explore how to modify data in a view using the [AUTOS] sample database. Enclosed is the complete TSQL for this article including the…
Finding Table Info
Just the other day I was asked by a Business Line Manager about the usage patterns of tables in a database that I never seen before. I was lucky that the version of the database was 2005 and Dynamic Management Views existed that stored the requirement information. Today, I am going to review a simple SELECT query that will retrieve the information that we want. The first requirement is to list the schema names that the user tables belong to. We can obtain this information by looking at the sys.schemas…
User Defined Views – Part 3
Today, I want to continue talking about database objects that are associated with stored (compiled) code. A view can be though as a virtual table whose contents are defined by a TSQL query based on one or more tables in the database. Typical uses of a view are the following: To simplify or customize the perception each user has of the database. Security mechanism to grant users access to the view, not the underlying base tables. To provide a backward compatible interface to emulate a table whose schema has…
User Defined Views – Part 2
Today, I want to continue talking about database objects that are associated with stored (compiled) code. A view can be though as a virtual table whose contents are defined by a TSQL query based on one or more tables in the database. Typical uses of a view are the following: To simplify or customize the perception each user has of the database. Security mechanism to grant users access to the view, not the underlying base tables. To provide a backward compatible interface to emulate a table whose schema has…
User Defined Views – Part 1
Today, I want to continue talking about database objects that are associated with stored (compiled) code. A view can be though as a virtual table whose contents are defined by a TSQL query based on one or more tables in the database. Typical uses of a view are the following: To simplify or customize the perception each user has of the database. Security mechanism to grant users access to the view, not the underlying base tables. To provide a backward compatible interface to emulate a table whose schema has…
Outer Apply Operator
The SELECT reserved word is part of the Data Manipulation Language (DML) defined by Codd and is used to query data from the database. Because of its popularity, there are many clauses and functions that can be used to construct a query to retrieve data. Today, I am continuing our exploration of this reserved word by reviewing queries that merge data using the APPLY operator. The APPLY operator come in two flavors: CROSS and OUTER. I am going to concentrate on the later during this discussion. I will be using…