source code to generate barcode in vb.net 10: Basic Data-Access Techniques in C#.NET

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10: Basic Data-Access Techniques
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The ORDER BY clause lets us request that the result be returned in specific sorted order The following example requests that the result be sorted on the LastName column:
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/* Retrieve the First Name, Last Name, City and Country for all the staff and sort on the LastName column*/ USE Northwind SELECT FirstName, LastName, City, Country FROM Employees ORDER BY LastName
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The preceding query returns the following result:
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FirstName ---------Steven Laura Nancy Anne Andrew Robert Janet Margaret Michael LastName -------------------Buchanan Callahan Davolio Dodsworth Fuller King Leverling Peacock Suyama City --------------London Seattle Seattle London Tacoma London Kirkland Redmond London Country --------------UK USA USA UK USA UK USA USA UK
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You can combine these SELECT clauses as you need them Here are some recommendations for working with SELECT statements: Never use the column name wildcard (*) in the SELECT statement; list all the columns you need instead Always include a WHERE clause to limit the number of rows returned If you need the data sorted, use the ORDER BY clause JOIN You will often need to combine data from two or more tables, and the JOIN clause allows you to perform this task JOIN statements are used to query any number of tables and return a single result set that contains merged data from these tables Joins are a central part of relational database theory and are used in the real world to implement relations between entities in a normalized data model There are three types of joins in SQL: inner joins, outer joins, and cross joins These joins are described in Table 10-7 The syntax for an inner join is as follows:
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SELECT select_list FROM first_table_name [INNER] JOIN join_table_name ON join_condition
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The ON keyword defines the comparison that must be true for the inner join to return the row The INNER keyword is optional, as it is the default join in the ANSI92 SQL standard
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Join Type Description
Inner join
Outer join
Cross join
The inner join combines tables based on the equality comparison of data values in common columns in the two tables Only rows that match the comparison are returned in the result set The outer join combines rows from two tables based on the equality comparison of data values in common columns in the tables The outer join returns all matching rows plus all the unmatched rows from one of the tables The LEFT OUTER JOIN returns all the rows from the table that is named first, plus all the rows in the last named table that match the comparison The RIGHT OUTER JOIN returns all the rows from the table that is named last, plus all rows from the first table that match the comparison A cross join produces a Cartesian product of the rows in both tables it returns all possible combinations of rows You do not specify any condition, as no comparison is used The cross join is used to generate test data for databases
The Different Join Types
Table 10-7
Let s look at an example Figure 10-7 shows the relationships between three tables The relationship is set up to enable us to join the three tables together The EmployeeID column is used to connect the Employees and EmployeeTerritories tables, and the TerritoryID column is used to connect the EmployeeTerritories and Territories tables If we needed to query this database and return TerritoryDescription, FirstName, and LastName for an employee with a last name of Buchanan, we could use the following query:
USE Northwind SELECT TerritoryDescription, FirstName, LastName FROM Employees JOIN EmployeeTerritories ON EmployeesEmployeeID = EmployeeTerritoriesEmployeeID JOIN Territories ON EmployeeTerritoriesTerritoryID = TerritoriesTerritoryID WHERE LastName = 'Buchanan'
This query will return all records for employees named Buchanan where there is an entry for a territory
TerritoryDescription ---------------------------------------Providence Morristown Edison New York New York Mellvile Fairport FirstName ---------Steven Steven Steven Steven Steven Steven Steven LastName -------------------Buchanan Buchanan Buchanan Buchanan Buchanan Buchanan Buchanan
Let us take a look at what happened The SELECT line specifies the columns that we need; notice that we used the name of the column from the Territories table without
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