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SQL Server 2000 introduces the table datatype. A statement declaring a table variable initializes the variable as an empty table with a specified structure. As a table definition, such a statement includes definitions of columns with their datatype, size, precision, optional primary key, unique and check constraints, and indexes. All elements have to be defined during the declaration. It is not possible to alter or add them later. The following batch declares a table variable, inserts rows in it, and returns them to the user:

Declare @MyTableVar table (Id int primary key, Lookup varchar(15)) Insert @MyTableVar values (1, '1Q2000') Insert @MyTableVar values (2, '2Q2000') Insert @MyTableVar values (3, '3Q2000') Select * from @MyTableVar Go

Because of their nature, table variables have certain limitations:

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Views based on multiple instances of the same table are called partitioned views. A horizontal partitioning occurs when different subsets of records are stored in different table instances (as in the preceding example). It is also possible to do vertical partitioning to put columns in separate tables based on the frequency with which they are needed. On wide tables, each record occupies a substantial amount of space. Since each data page is limited to 8KB, a smaller number of records can fit onto a single data page. As a result, the number of IO operations needed to access a large number of records is much higher. To reduce it, we can put frequently used fields in one table and other fields in a second table. The tables will have a one-to-one relationship. In the following example, the InventorySum table has been split into InventoryPrim and InventorySec tables:

Table variables can only be part of the Select, Update, Delete, Insert, and Declare Cursor statements. Table variables can be used as a part of the Select statement everywhere tables are acceptable, except as the destination in a Select...Into statement:

Table variables can be used in Insert statements except when the Insert statement collects values from a stored procedure:

Unlike temporary tables, table variables always have a local scope. They can be used only in the batch, stored procedure, or function in which they are declared. The scope of cursors based on table variables is limited to the scope of the variable (the batch, stored procedure, or function in which they are defined). Table variables are considered to be nonpersistent objects, and therefore they will not be rolled back after a Rollback Transaction statement.

Flow control statements from TSQL are rather rudimentary as compared with similar commands in other modern programming languages such as Visual Basic or C++. Their use requires knowledge and some skill to overcome their lack of user friendliness. However, on a positive note, they allow the creation of very complex procedures. This section covers the use of the following Transact-SQL statements and programming constructs:

4:

Developers can mark comments inside the source code of a batch or a stored procedure so that they are ignored during compilation and execution by SQL Server. It is a common practice to accompany source code with remarks that will help readers to understand the programmer s intentions. Comments can also be a piece of Transact-SQL source code that the developer does not want to execute for a particular reason (usually while developing or debugging). Such a process is usually referred to as commenting out the code.

CREATE TABLE [dbo].[InventoryPrim] ( [Inventoryid] [int] NOT NULL , [Make] [varchar] (50) NULL , [Model] [varchar] (50) NULL ,

There are two methods to indicate a comment. A complete line or part of the line can be marked as a comment if the user places two hyphens (- -) at the beginning. The remainder of the line will become a comment. The comment will be finished at the end of line:

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