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Try It Out: Defining a Table Through Query Editor
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1. Ensure that you are pointing to the ApressFinancial database in Query Editor, as shown in Figure 5-12.
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Figure 5-12. Selecting the database from the toolbar 2. In the Query Editor, enter the following code: CREATE TABLE TransactionDetails.Transactions (TransactionId bigint IDENTITY(1,1) NOT NULL, CustomerId bigint NOT NULL, TransactionType int NOT NULL, DateEntered datetime NOT NULL, Amount numeric(18, 5) NOT NULL, ReferenceDetails nvarchar(50) NULL, Notes nvarchar(max) NULL, RelatedShareId bigint NULL, RelatedProductId bigint NOT NULL)
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Note Notice that when you type this code into the Query Editor, the keywords are colored. For example,
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CREATE TABLE is in blue and NOT NULL is in gray. This helps you to avoid typing mistakes.
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3. Execute the code by either pressing Ctrl+E or F5 or clicking the toolbar Execute button. 4. You should now see the following message in the Results pane: The command(s) completed successfully.
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CHAPTER 5 DEFINING TABLES
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5. However, you may have received an error message instead. This could be for a number of reasons, from a typing mistake through to not having the authority to create tables. I could list every message that you could receive at this point, but I would be doing so for many pages. Taking one example here, as you can see, the error messages generated are usually self-explanatory. This is informing me that I have a typing error on line 5. Msg 102, Level 15, State 1, Line 5 Incorrect syntax near 'NUL'. 6. Now move to the Object Explorer. If it is already open, you will have to refresh the Details pane (by rightclicking the Tables node and selecting Refresh). You should then see the TransactionDetails. Transactions table alongside the CustomerDetails.Customers table created previously.
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How It Works: Defining a Table Though the Query Pane
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Using the Query pane to define a table works very much like SQL Server Management Studio without the graphical aids. Recall that SQL Server Management Studio has prompts for column name, data type, and so on, but here you have to type in every detail. All of the code will be discussed in a moment. However, many people prefer to create a table this way. Having to switch between cursor and keyboard when using the graphical designer can be slower than keying in the details in Query Editor. There is not a lot of time required to create a table this way, and we can build up the table creation as we go along. The query can be saved to a file until it is time to run it and build the table in the database. Let s now take a look at the T-SQL code that we used to create the table. This code does not include all the options available for creating a table, as there are a large number not used within this book. If you need to use more options or discover what they are, then check in Books Online. When it comes to putting a database solution into a production environment, you should consider these options, although some of them will be for larger enterprise production solutions. The basic syntax for creating a table is as follows: CREATE TABLE [database_name].[schema_name].table_name (column_name data_type [length] [IDENTITY(seed, increment)] [NULL/NOT NULL]) There are a greater number of possible options, but for the moment let s just concentrate on the ones mentioned previously. You should be able to create most tables using this syntax. The items listed in square brackets in the CREATE TABLE syntax are optional; however, there are times when we will require them. Let me explain. Take the first option, database_name: if you are in the master database and you wish to create a table in the ApressFinancial database, you would have to either switch to that database with the USE command or use the database_name option. Usually you will be in the database where you want to create the table, but this option is ideal when creating code that will be executed unattended. It will ensure that the table is built for the correct database rather than trusting that you are in the right area. The schema_name option allows us to assign the table to the correct and relevant schema, rather than in the default schema of the user connected. Next we define the columns. Column name and data type are mandatory. However, depending on the data type, the length is optional. You must prefix the first column with an opening parenthesis (and once you have defined the last column, close the list with a closing parenthesis). Each column should be separated from the previous column by a comma. There is a limit of 1,024 columns for a table. If you get anywhere close to that number, you should sit back and reevaluate your table design, because chances are the design needs to be revised.
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