qr code generator c# Lesson 5: Applying Built-in Scalar Functions in Visual C#

Drawer QR Code 2d barcode in Visual C# Lesson 5: Applying Built-in Scalar Functions

Lesson 5: Applying Built-in Scalar Functions
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String Functions
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String functions perform an operation on string expressions. Listed here are several of the more common string functions:
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LEFT, RIGHT Returns the specified number of characters from the specified side (left or right) of the expression. UPPER, LOWER
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Returns the specified case (uppercase or lowercase) for all characters
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in the expression.
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Receives an expression as input and returns a certain number of characters after a starting point. For example, SUBSTRING(FirstName,1,3) starts at the first character of the value in the FirstName column and returns the next three characters.
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SUBSTRING REPLACE
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Replaces one string with another within a defined string.
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LEN Returns the number of characters within a defined string. If you would like the number of bytes rather than characters, you should use the DATALENGTH function.
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Additional Functions
The following functions are also commonly required:
DATALENGTH Returns the number of bytes required to represent an expression. Can be used with any data type, but is especially useful with varchar, varbinary, and nvarchar, binary, and image data types. PATINDEX
Returns the starting position of the first occurrence of a specified pattern within a defined string.
Returns the starting position, if found, of a defined string within another defined string. The function also accepts an optional input of start_location, which defines the point within the second expression at which the comparisons should begin.
CHARINDEX
Pr actice
Using built-in Scalar Functions
In this practice session, you use a variety of built-in scalar functions to add meaning and formatting to your result sets.
e xercise
Write Queries That Include Built-in Functions
In this exercise, you use the DATENAME, DATEPART, DATEDIFF, LEFT, REPLACE, and CONVERT functions.
1. 2.
Open a new query window in SSMS. In the existing query window, type and execute the following code to retrieve the day of the week on which each order was placed, arranged by the day of the week:
USE AdventureWorks2008; SELECT SalesOrderID, DATENAME(DW, orderdate) AS 'Day of Week' FROM Sales.SalesOrderHeader ORDER BY DATEPart(DW, orderdate);
Data Retrieval
In the existing query window, below the existing code, type, highlight, and execute the following code to retrieve the number of days that passed between when an order was placed and when it was shipped:
SELECT SalesOrderID, DATEDIFF(DD, Orderdate, ShipDate ) AS 'Days lapsed' FROM Sales.SalesOrderHeader;
In the existing query window, below the existing code, type, highlight, and execute the following code to return a column named Employee Code that is made up of the first three characters of each employee s first name and first three characters of their last name:
SELECT LEFT(FirstName, 3) + LEFT(LastName, 3)AS 'Employee Code' FROM Person.Person;
In the existing query window, below the existing code, type, highlight, and execute the following code to replace the word bike with the word bicycle in all product descriptions:
SELECT REPLACE(Description, 'bike', 'bicycle') FROM Production.ProductDescription;
In the existing query window, below the existing code, type, highlight, and execute the following code to return each employee s name and employee number in a single column. To accomplish this, you must convert the BusinessEntityID (which represents the employee number) column to a character data type:
SELECT FirstName + ' ' + Lastname + ' Employee Number: ' + CONVERT(char, E.BusinessEntityID) FROM HumanResources.Employee AS E JOIN Person.Person AS P ON P.BusinessEntityID = E.BusinessEntityID;
In the existing query window, below the existing code, type, highlight, and execute the following code to return the order number and order date. Format the date so that the time information is not included:
SELECT SalesOrderNumber, CONVERT(varchar(30), OrderDate, 107) FROM Sales.SalesOrderHeader;
Modify the date style to additional formats such as 11, 03, 111, 114, and 103. Notice that 114 does not provide the required information, while 03 and 11 would be confusing to any user not familiar with those formats. Save the script and close SSMS.
Lesson Summary
n n n
Use built-in functions to provide more meaningful result sets. Use date and time functions to manipulate and return date information. Use string functions to format or return information about string expressions.
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