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Try It Out: Adding a Column
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1. First of all, open up the Query Editor and ensure that you are pointing to the ApressFinancial database. Then write the code to alter the TransactionDetails.TransactionTypes table to add the new column. The format is very simple. We specify the table prefixed by the schema name we want to alter after the ALTER TABLE command. Next we use a comma-delimited list of the columns we wish to add. We define the name, the data type, the length if required, and finally whether we allow NULLs or not. As we don t want the existing data to have any default values, we will have to define the column to allow NULL values.
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CHAPTER 5 DEFINING TABLES
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ALTER TABLE TransactionDetails.TransactionTypes ADD AffectCashBalance bit NULL GO 2. Once we ve altered the data as required, we then want to remove the ability for further rows of data to have a NULL value. This new column will take a value of 0 or 1. Again, we use the ALTER TABLE command, but this time we ll add the ALTER COLUMN statement with the name of the column we wish to alter. After this statement are the alterations we wish to make. Although we are not altering the data type, it is a mandatory requirement to redefine the data type and data length. After this, we can inform SQL Server that the column will not allow NULL values. ALTER TABLE TransactionDetails.TransactionTypes ALTER COLUMN AffectCashBalance bit NOT NULL GO 3. Execute the preceding code to make the TransactionDetails.TransactionTypes table correct.
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Defining the Remaining Tables
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Now that three of the tables have been created, we need to create the remaining four tables. We will do this as code placed in Query Editor. There is nothing specifically new to cover in this next section, and therefore only the code is listed. Enter the following code and then execute it as before. You can then move into SQL Server Management Studio and refresh it, after which you should be able to see the new tables. USE ApressFinancial GO CREATE TABLE CustomerDetails.CustomerProducts( CustomerFinancialProductId bigint NOT NULL, CustomerId bigint NOT NULL, FinancialProductId bigint NOT NULL, AmountToCollect money NOT NULL, Frequency smallint NOT NULL, LastCollected datetime NOT NULL, LastCollection datetime NOT NULL, Renewable bit NOT NULL ) ON [PRIMARY] GO CREATE TABLE CustomerDetails.FinancialProducts( ProductId bigint NOT NULL, ProductName nvarchar(50) NOT NULL ) ON [PRIMARY]
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CHAPTER 5 DEFINING TABLES
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GO CREATE TABLE ShareDetails.SharePrices( SharePriceId bigint IDENTITY(1,1) NOT NULL, ShareId bigint NOT NULL, Price numeric(18, 5) NOT NULL, PriceDate datetime NOT NULL ) ON [PRIMARY] GO CREATE TABLE ShareDetails.Shares( ShareId bigint IDENTITY(1,1) NOT NULL, ShareDesc nvarchar(50) NOT NULL, ShareTickerId nvarchar(50) NULL, CurrentPrice numeric(18, 5) NOT NULL ) ON [PRIMARY] GO
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Setting a Primary Key
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Setting a primary key can be completed in SQL Server Management Studio with just a couple of mouse clicks. This section will demonstrate how easy this actually is. For more on keys, see 3.
Try It Out: Setting a Primary Key
1. Ensure that SQL Server Management Studio is running and that you have navigated to the ApressFinancial database. Find the ShareDetails.Shares table, and right-click and select Modify. Once in the Table Designer, select the ShareId column. This will be the column we are setting the primary key for. Right-click to bring up the pop-up menu shown in Figure 5-15.
Figure 5-15. Defining a primary key
CHAPTER 5 DEFINING TABLES
2. Select the Set Primary Key option from the pop-up menu. This will then change the display to place a small key in the leftmost column details. Only one column has been defined as the primary key, as you see in Figure 5-16.
Figure 5-16. Primary key defined 3. However, this is not all that happens, as you will see. Save the table modifications by clicking the Save button. Click the Manage Indexes/Keys button on the toolbar. This brings up the dialog box shown in Figure 5-17. Look at the Type, the third option down in the General section. It says Primary Key. Notice that a key definition has been created for you, with a name and the selected column, informing you that the index is unique and clustered (more on indexes and their relation to primary keys in 6).
Figure 5-17. Indexes/Keys dialog box That s all there is to creating and setting a primary key. A primary key has now been set up on the ShareDetails.Shares table. In this instance, any record added to this table will ensure that the data will be kept in ShareId ascending order (this is to do with the index, which you will see in 6), and it is impossible to insert a duplicate row of data. This key can then be used to link to other tables within the database at a later stage.
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