Working with Transact-SQL in .NET

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Working with Transact-SQL
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Create a local temporary table by using the CREATE TABLE command and prefixing the table name with #:
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CREATE TABLE #LocalTempTable ( Column1 INT, Column2 VARCHAR(20) )
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Create global temporary tables by prefixing the table name with ##:
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CREATE TABLE ##GlobalTempTable ( Column1 INT, Column2 VARCHAR(20) )
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Using the SELECT INTO Command
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In many situations, developers need to create tables that have the same column definition as a table that already exists. Or developers might need to create a table based on the results of a query. In either case, you can use the SELECT INTO command to create a new table. By adding the INTO clause to a SELECT statement after the SELECT list, SQL Server creates the table name in the INTO clause, using the results of the SELECT, if the table does not already exist. If the table already exists, SQL Server returns an exception. To create a table that has the same columns and data as another table already in the system, use SELECT INTO with SELECT *. The following query creates a table called Address2 from the data in the Address table:
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SELECT * INTO Address2 FROM Person.Address
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SELECT INTO is commonly used in stored procedures to create local temporary tables. Instead of using the CREATE TABLE syntax and inserting the data into the temporary table, developers can use the SELECT INTO command to do both operations. The following query creates a local temporary table called #FemaleEmployees that contains all employee IDs for female employees in the Employee table:
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SELECT EmployeeId INTO #FemaleEmployees FROM HumanResources.Employee WHERE Gender = 'F'
Lesson 3: Modifying Data
Quick Check
Should you use SELECT INTO to insert data into tables that already exist No. If you use SELECT INTO, and the target table already exists, an error will be returned.
Quick Check Answer
PRACTICE
Create and Use a Temporary Table
In this practice, you will create a temporary table and use it to join to another table. Assume that you need to find all addresses for salaried employees. 1. If necessary, open SSMS and connect to your SQL Server. 2. Open a new query window and select AdventureWorks as the active database. 3. Type the following query and execute it:
SELECT EmployeeId FROM HumanResources.Employee WHERE SalariedFlag = 1
4. This query returns all employee IDs for salaried employees. To create a temporary table with this data, you can use SELECT INTO. Type and execute the following query:
SELECT EmployeeId INTO #SalariedEmployees FROM HumanResources.Employee WHERE SalariedFlag = 1
5. A local temporary table called #SalariedEmployees now exists. You can see the employee IDs in the table by using the following query:
SELECT EmployeeId FROM #SalariedEmployees
6. The following query returns all addresses from the EmployeeAddress table:
SELECT * FROM HumanResources.EmployeeAddress
5
Working with Transact-SQL
7. Add a WHERE clause to the query that includes a noncorrelated subquery using the IN predicate:
SELECT * FROM HumanResources.EmployeeAddress WHERE EmployeeId IN ( SELECT EmployeeId FROM #SalariedEmployees )
8. Execute the query.
Lesson Summary
Use cursors as sparingly as possible, preferably only for administrative tasks. Temporary tables can make it easier to express complex logic in a maintainable way and improve performance, letting you cache intermediate results. SELECT INTO lets you create tables that have the same column definition as a table that already exists or to create a table based on the results of a query.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of this book.
1. What are the three types of cursors available in SQL Server (Choose all that apply.) A. Static B. Firehose C. Dynamic D. Keyset
Lesson 3: Modifying Data
2. Which of the following syntaxes will create a global temporary table A. CREATE TABLE #TableName (Column INT) B. CREATE TABLE ##TableName (Column INT) C. DECLARE @TableName TABLE (Column INT) D. SELECT CONVERT (INT, NULL) INTO #TableName 3. Which situations can you use SELECT INTO for (Choose all that apply.) A. Create a new local temporary table. B. Create a new permanent table. C. Insert data into an existing global temporary table. D. Create a new global temporary table.
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