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1. The first example will create a local temporary table based on the CREATE TABLE statement. We will then populate the table with some data, and retrieve the data. We will then open up a different Query Editor pane and try and retrieve data from the table to show that it is local. Also of interest here is how we can use a SELECT statement in conjunction with an INSERT statement to add the values. Providing that the number of columns returned in the SELECT match either the number of columns within the table or the number of columns in the INSERT column list, using a SELECT statement is a great way of populating a table, especially temporary tables. First, create the temporary table. For the moment, just enter the code, don t execute it.
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CHAPTER 11 T-SQL ESSENTIALS
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CREATE TABLE #SharesTmp (ShareDesc varchar(50), Price numeric(18,5), PriceDate datetime) 2. Next we want to populate the temporary table with information from the ShareDetails.Shares and the ShareDetails.SharePrices tables. Because we are populating every column within the table, we don t need to list the columns in the INSERT INTO table part of the query. Then we use the results from a SELECT statement to populate many rows in one set of T-SQL. You can execute the code now if you want, but when we get to the third part in a moment, run the SELECT * from the same Query Editor window. INSERT SELECT FROM JOIN INTO #SharesTmp s.ShareDesc,sp.Price,sp.PriceDate ShareDetails.Shares s ShareDetails.SharePrices sp ON sp.ShareId = s.ShareId
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3. The final part is to prove that there is data in the table. SELECT * FROM #SharesTmp 4. When the code is executed, you should see the output that appears in Figure 11-10.
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Figure 11-10. Temporary table 5. Open up a fresh Query Editor and then try and execute the following code: SELECT * FROM #SharesTmp 6. Now instead of returning a set of results like those in Figure 11-10, you will get an error message: Msg 208, Level 16, State 0, Line 1 Invalid object name '#SharesTmp'. 7. If we change the whole query to now work with a global temporary variable, you will see a different end result. To ensure we are starting afresh, clear all the Query Editors, or execute the following DROP TABLE command in the first Query Editor. DROP TABLE #SharesTmp
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CHAPTER 11 T-SQL ESSENTIALS
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8. Enter the following code, taking note of the double hash marks, in one of the Query Editors. CREATE TABLE ##SharesTmp (ShareDesc varchar(50), Price numeric(18,5), PriceDate datetime) INSERT INTO ##SharesTmp SELECT s.ShareDesc,sp.Price,sp.PriceDate FROM ShareDetails.Shares s JOIN ShareDetails.SharePrices sp ON sp.ShareId = s.ShareId SELECT * FROM ##SharesTmp 9. When you execute the code, you should see the same results as you did with the first query (refer back to Figure 11-10). 10. Move to a new Query Editor, ensuring that you leave the previous Query Editor pane still open. Then enter the following SELECT statement: SELECT * FROM ##SharesTmp 11. When this is executed, you see the same results again, as shown originally in Figure 11-10. It is not until the first Query Editor pane that defined the global table is closed or until a DROP TABLE ##SharesTmp is executed that the table will disappear.
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An aggregation is where SQL Server performs a function on a set of data to return one aggregated value per grouping of data. This will vary from counting the number of rows returned from a SELECT statement through to figuring out maximum and minimum values. Combining some of these functions with the DISTINCT function, discussed later in the section Distinct Values, can provide some very useful functionality. An example might be when you want to show the highest value for each distinct share to demonstrate when the share was worth the greatest amount. Let s dive straight in by looking at different aggregation types and working through examples of each.
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