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BRAINDUMP

All About SQL Functions
By: James Payne
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    2007-12-17


    Table of Contents:
  • All About SQL Functions
  • More Aggregate Functions
  • STDEV
  • Scalar Functions
  • Mid(c,start[,end]
  • Round(c,decimals)

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    All About SQL Functions - Scalar Functions
    ( Page 4 of 6 )

    Scalar functions work against one value and return one value based on the input. Aggregate functions work on a bunch of data and return one result. I understand if you fell asleep during that; I did just writing it.

    Here is a table of scalar functions.

     

    Function Name

    What it does

    UCASE(c)

    Changes a field to Uppercase

    LCASE(c)

    Changes a field to lowercase

    MID(c,start[,end])

    Extracts characters from a text field

    LEN(c)

    Returns the length of a text field

    INSTR(c,char)

    Returns the position of a character in a field

    LEFT(c,number_of_char)

    Returns the left part of text

    RIGHT(c,number_of_char)

    Returns the right part of text

    ROUND(c,decimals)

    Rounds a numeric field to a number of decimals

    MOD(x,y)

    Gives the remainder in division

    NOW()

    Returns the present system date

    FORMAT(c,format)

    Formats a field

    DATEDIFF(d,date1,date2)

    For date calculation

    UCASE(c)

    If you want make all the characters of a selected item uppercase, you can use the UCASE function, like so:


    Select UCASE('darth ladel') from Employees;

    This will return the following: DARTH LADEL

    LCASE(c)

    Likewise, you may also wish to force all of the characters to be lowercase.


    Select LCASE('Darth Brooks') from Employees;



     
     
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