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CHAPTER 5 DEFINING TABLES
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-- Create table template -- ========================================= USE ApressFinancial GO IF OBJECT_ID('TransactionDetails.TransactionTypes', 'U') IS NOT NULL DROP TABLE TransactionDetails.TransactionTypes GO CREATE TABLE TransactionDetails.TransactionTypes( TransactionTypeId int IDENTITY(1,1) NOT NULL, TransactionDescription nvarchar(30) NOT NULL, CreditType bit NOT NULL ) GO Now that we have our third table, we can look at altering the template of the CREATE TEMPLATE, as it would be better to have the IDENTITY parameter there as well as four or five columns.
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Creating and Altering a Template
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The processes for creating and altering a template follow the same steps. All templates are stored in a central location and are available for every connection to SQL Server on that computer, therefore templates are not database or server restricted. The path to where they reside is C:\Program Files\Microsoft SQL Server\ 90\Tools\Binn\VSShell\Common7\IDE\sqlworkbenchnewitems\Sql It is also possible to create a new node for templates from within the Template Explorer by right clicking and selecting New Folder.
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Note Don t create the folder directly in the Sql folder, as this is not picked up by SQL Server Management
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Studio until you exit and reenter the SQL Server Management Studio.
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You could create different formats of templates for slightly different actions on tables. We saw the CREATE TABLE template previously, but what if we wanted a template that included a CREATE TABLE specification with an IDENTITY column This is possible by taking a current template and upgrading it for a new template.
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CHAPTER 5 DEFINING TABLES
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Try It Out: Creating a Template from an Existing Template
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1. From the Template Explorer, find the CREATE TABLE template, right-click it, and select Edit. This will display the template that we saw earlier. Change the comment and then we can start altering the code. 2. The first change is to add that the first column is an IDENTITY column. We know where this is located from our code earlier: it comes directly after the data type. To add a new parameter, input a set of angle brackets, then create the name of the parameter as the first option. The second option is the type of parameter this is, for example, sysname, defining that the parameter is a system name, which is just an alias for nvarchar(256). The third option is the value for the parameter; in this case we will be including the value of IDENTITY(1,1). The final set of code follows, where you can also see a fourth column has been defined with a bit data type.
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Tip You can check the alias by running the sp_help_sysname T-SQL command.
-- ========================================= -- Create table template with IDENTITY -- ========================================= USE <database, sysname, AdventureWorks> GO IF OBJECT_ID('<schema_name, sysname, dbo>.<table_name, sysname, sample_table>', 'U') IS NOT NULL DROP TABLE <schema_name, sysname, dbo>.<table_name, sysname, sample_table> GO CREATE TABLE <schema_name, sysname, dbo>.<table_name, sysname, sample_table>( <column1_name, sysname, c1> <column1_datatype, , int> <identity,,IDENTITY (1,1)> <column1_nullability,, NOT NULL>, <column2_name, sysname, c2> <column2_datatype, , char(10)> <column2_nullability,, NULL>, <column3_name, sysname, c3> <column3_datatype, , datetime> <column3_nullability,, NULL>, <column4_name, sysname, c4> <column4_datatype, , bit> <column4_nullability,, NOT NULL>, CONSTRAINT <contraint_name, sysname, PK_sample_table> PRIMARY KEY (<columns_in_primary_key, , c1>) ) GO
CHAPTER 5 DEFINING TABLES
3. Now the code is built, but before we test it, we shall save this as a new template called CREATE TABLE with IDENTITY. From the menu, select File Save CREATE TABLE.sql As, and from the Save File As dialog box, save this as CREATE TABLE with IDENTITY.sql. This should update your Template Explorer, but if it doesn t, try exiting and reentering SQL Server Management Studio, after which it will be available to use.
The ALTER TABLE Command
If, when using the original template, we had created the table with only three columns, we would have an error to correct. One solution is to delete the table with DROP TABLE, but if we had placed some test data in the table before we realized we had missed the column, this would not be ideal. There is an alternative: the ALTER TABLE statement, which allows restrictive alterations to a table layout but keeps the contents. SQL Server Management Studio uses this statement when altering a table graphically, but here I will show you how to use it to add the missing fourth column for our TransactionTypes table. Columns can be added, removed, or modified using the ALTER TABLE command. Removing a column will simply remove the data within that column, but careful thought has to take place before adding or altering a column. There are two scenarios when adding a new column to a table: should it contain NULL values for all the existing rows, or should there be a default value instead Any new columns created using the ALTER TABLE statement where a value is expected (or defined as NOT NULL) will take time to implement. This is because any existing data will have NULL values for the new column; after all, SQL Server has no way of knowing what value to enter. When altering a table and using NOT NULL, you need to complete a number of complex processes, which include moving data to an interim table and then moving it back. The easiest solution is to alter the table and define the column to allow NULLs, add in the default data values using the UPDATE T-SQL command, and alter the column to NOT NULL.
Note It is common practice when creating columns to allow NULL values, as the default value may not be
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