DATETIME SELECT SELECT INTO DATE PAD STRING DYNAMIC SQL CURSOR MONEY FORMAT PERCENT STORED PROCEDURE SQL SERVER AGENT JOB OPTIMIZATION WHILE LOOP OVER PARTITION BY UPDATE
 
 
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How to use the DATALENGTH function?

The following Microsoft SQL Server T-SQL code samples demonstrate the usage for the DATALENGTH function and the difference between LEN() and DATALENGTH():

 

-- The LEN function counts characters(ASCII/UNICODE) without trailing spaces (RTRIM)

-- The DATALENGTH function counts bytes allocated including trailing spaces

DECLARE @string char(5) = 'ABC'

SELECT [LEN]=LEN(@string), [DATALENGTH]=DATALENGTH(@string)

/*    LEN DATALENGTH

      3   5    */

------------

DECLARE @nstring nchar(5) = N'ABC'

SELECT [LEN]=LEN(@nstring), [DATALENGTH]=DATALENGTH(@nstring)

/*    LEN   DATALENGTH

      3     10    */

------------

DECLARE @string varchar(5) = 'ABC '

SELECT [LEN]=LEN(@string), [DATALENGTH]=DATALENGTH(@string)

/*    LEN   DATALENGTH

      3     4  */

------------

DECLARE @nstring nvarchar(5) = N'ABC '

SELECT [LEN]=LEN(@nstring), [DATALENGTH]=DATALENGTH(@nstring)

/*    LEN   DATALENGTH

      3     8  */

------------

 

------------

-- LEN/DATALENGTH Application to non-string data types

------------

DECLARE @money money = 123

SELECT [LEN]=LEN(@money), [DATALENGTH]=DATALENGTH(@money)

/*    LEN   DATALENGTH

      6     8  */

------------

DECLARE @varbinary varbinary(max) = 0xFFEEDDCCBBAA2020

SELECT [LEN]=LEN(@varbinary), [DATALENGTH]=DATALENGTH(@varbinary)

/*    LEN   DATALENGTH

      6     8  */

------------

DECLARE @binary binary(12) = 0xFFEEDDCCBBAA2020

SELECT [LEN]=LEN(@binary), [DATALENGTH]=DATALENGTH(@binary)

/*    LEN   DATALENGTH

      12    12  */

------------

 

 

USE Northwind;

 

SELECT ' OrderID,'                                    AS [Column],

       (SELECT MAX(DATALENGTH(OrderID))

        FROM   Orders)                          AS [DATALENGTH]

UNION ALL

SELECT ' ShipName,',

       (SELECT MAX(DATALENGTH(ShipName))

        FROM   Orders)

UNION ALL

SELECT ' ShipAddress,',

       (SELECT MAX(DATALENGTH(ShipAddress))

        FROM   Orders)

UNION ALL

SELECT ' ShipCity,',

       (SELECT MAX(DATALENGTH(ShipCity))

        FROM   Orders)

UNION ALL

SELECT ' ShipRegion,',

       (SELECT MAX(DATALENGTH(ShipRegion))

        FROM   Orders)

/*

Column            DATALENGTH

 OrderID,         4

 ShipName,        68

 ShipAddress,     92

 ShipCity,        30

 ShipRegion,      26

 */

 

Exam Prep 70-461
SQL 2016 DESIGN & PROGRAMMING
 
 
 
DATETIME SELECT SELECT INTO DATE PAD STRING DYNAMIC SQL CURSOR MONEY FORMAT PERCENT STORED PROCEDURE SQL SERVER AGENT JOB OPTIMIZATION WHILE LOOP OVER PARTITION BY UPDATE