If your application does not use TableAdapters, call the ExecuteReader method on a command object, setting its CommandType property to Text.
Additionally, a column heading is added. The first example returns total sales and the discounts for each product. In the second example, the total revenue is calculated for each product.
Using correlated subqueries The following example shows queries that are semantically equivalent and illustrates the difference between using the EXISTS keyword and the IN keyword.
Both are examples of a valid subquery that retrieves one instance of each product name for which the product model is a long sleeve logo jersey, and the ProductModelID numbers match between the Product and ProductModel tables. This is a query that depends on the outer query for its values.
The query is executed repeatedly, one time for each row that may be selected by the outer query. This query retrieves one instance of the first and last name of each employee for which the bonus in the SalesPerson table is Employee AS e ON e.
It requires a value for Employee. This example finds the product models for which the maximum list price is more than twice the average for the model. ProductModelID ; GO This example uses two correlated subqueries to find the names of employees who have sold a particular product.
Employee e ON e.
You can group by an expression if the expression does not include aggregate functions. It groups the rows in the SalesOrderDetail table by product ID and eliminates products whose average order quantities are five or less. It also organizes the results by ProductID. The query looks like this: The first example shows how to force the optimizer to use a nonclustered index to retrieve rows from a table, and the second example forces a table scan by using an index of 0.
Person AS pp on e. Person AS pp ON e. Gloves; GO -- Create Gloves table. The second UNION is processed first because it is in parentheses, and returns 5 rows because the ALL option is not used and the duplicates are removed. This does not remove the duplicates between the two sets of 5 rows.
The final result has 10 rows.Adding a Model (C#) 01/12/; 3 minutes to read Contributors.
The goal of these articles is to help guide you through the process of writing SQL queries. The focus of the articles isn’t to teach you SQL, rather it is to help you understand how to properly pose questions into the form the database can understand. In this article I plan to demonstrate how to insert and read data from a SQL Server or MSDE database. This code should work on both SQL Server, I am using , and MSDE. I am using Visual Studio , but this should work with Visual Studio , Web Matrix, and the command line SDK. This code. Creating a Connection String and Working with SQL Server LocalDB The MovieDBContext class you created handles the task of connecting to the database and mapping Movie objects to database records. One question you might ask, though, is how to specify which database it will connect to.
In this article. by Rick Anderson. This tutorial will teach you the basics of building an barnweddingvt.com MVC Web application using Microsoft Visual Web Developer Express Service Pack 1, which is a free version of Microsoft Visual Studio. The SQL SELECT Statement.
The SELECT statement is used to select data from a database. The data returned is stored in a result table, called the result-set. In Visual Studio, on the File menu, point to New, and then select Project.. In the Project Types list of the New Project dialog box, expand the programming language you will use and select Visual C# or Visual Basic..
In the Templates list, select Console Application.. Provide a name (such as SQLCompactEDMProject) and location for your project, and then click OK.
Aug 30, · Writing efficient and high-quality SQL is hard to do. Sometimes it comes down to trialling different types of queries to get one that gives you the results you want and has good performance. There are a range of ‘best practices’ or tips that are recommended for working with SQL/5(24).
In this article I plan to demonstrate how to insert and read data from a SQL Server or MSDE database. This code should work on both SQL Server, I am using , and MSDE. I am using Visual Studio , but this should work with Visual Studio , Web Matrix, and the command line SDK.
This code. Procedure Call. Use this query type to call a database procedure. For example, Oracle PL/SQL statements start with barnweddingvt.com you use this SQL data type, no metadata is displayed on the data model structure tab, therefore you cannot modify the data structure or data fields.