Built in String Functions in SQL

Built in string functions in sql server 2008
Functions in SQL server can be broadly divided into 2 categories
1. Built-in functions
2. User Defined functions

There are several built-in functions. we will look at the most common string functions available.
ASCII(Character Expression) - Returns the ASCII code of the given character expression.
To find the ACII Code of capital letter 'A'

Example: Select ASCII('A')
Output: 65

CHAR(Integer_Expression) - Converts an int ASCII code to a character. The Integer_Expression, should be between 0 and 255.
The following SQL, prints all the characters for the ASCII values from o thru 255

Declare @Number int
Set @Number = 1
While(@Number <= 255)
Begin
Print CHAR(@Number)
Set @Number = @Number + 1
End

Note: The while loop will become an infinite loop, if you forget to include the following line.
Set @Number = @Number + 1

Printing uppercase alphabets using CHAR() function:
Declare @Number int
Set @Number = 65
While(@Number <= 90)
Begin
Print CHAR(@Number)
Set @Number = @Number + 1
End

Printing lowercase alphabets using CHAR() function:
Declare @Number int
Set @Number = 97
While(@Number <= 122)
Begin
Print CHAR(@Number)
Set @Number = @Number + 1
End

Another way of printing lower case alphabets using CHAR() and LOWER() functions.
Declare @Number int
Set @Number = 65
While(@Number <= 90)
Begin
Print LOWER(CHAR(@Number))
Set @Number = @Number + 1
End

LTRIM(Character_Expression) - Removes blanks on the left handside of the given character expression.

Example: Removing the 3 white spaces on the left hand side of the '   Hello' string using LTRIM() function.
Select LTRIM('   Hello vishal')
Output: Hello vishal

RTRIM(Character_Expression) - Removes blanks on the right hand side of the given character expression.

Example: Removing the 3 white spaces on the left hand side of the 'Hello   ' string using RTRIM() function.
Select RTRIM('Hello Vishal  ')
Output: Hello vishal

Example: To remove white spaces on either sides of the given character expression, use LTRIM() and RTRIM() as shown below.
Select LTRIM(RTRIM('   Hello   '))
Output: Hello

LOWER(Character_Expression) - Converts all the characters in the given Character_Expression, to lowercase letters.

Example: Select LOWER('CONVERT This String Into Lower Case')
Output: convert this string into lower case

UPPER(Character_Expression) - Converts all the characters in the given Character_Expression, to uppercase letters.
Example: Select UPPER('CONVERT This String Into upper Case')
Output: CONVERT THIS STRING INTO UPPER CASE

REVERSE('Any_String_Expression') - Reverses all the characters in the given string expression.
Example: Select REVERSE('ABCDEFGHIJKLMNOPQRSTUVWXYZ')
Output: ZYXWVUTSRQPONMLKJIHGFEDCBA

LEN(String_Expression) - Returns the count of total characters, in the given string expression, excluding the blanks at the end of the expression.

Example: Select LEN('SQL Functions   ')
Output: 13

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