freeCodeCamp/guide/english/sql/sql-server-convert-function/index.md

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SQL Server Convert Function

SQL Server Convert Function

Converts from one data type to another data type.

Covered in this guide :

• Convert a decimal number to an integer
• Convert a string to date
• Convert a decimal number into string
• Convert an integer number to decimal
• convert a string to date in usa format style

Convert command Syntax

CONVERT (_New Data Type, Expression, Style_)

New Data Type: New data type to be converted too. For example: nvarchar, integer, decimal, date
Expression: Data to be converted.
Style: Format. For example: The style 110 is USA Date format mm-dd-yyyy\

• Convert a Decimal Number to An Integer :

  SELECT  CONVERT(INT, 23.456) as IntegerNumber
  
  

  Result :

  +---+---------------+
  |   | IntegerNumber |
  +---+---------------+
  | 1 | 23            |
  +---+---------------+
  
  

  Note: The result is truncated.

• Convert a String to a Date :

  SELECT CONVERT(DATE, '20161030') as Date
  
  

  Result :

  +---+---------------+
  |   | Date          |
  +---+---------------+
  | 1 | 2016-10-30    |
  +---+---------------+
  
  

• Convert a Decimal to a String :

  SELECT CONVERT(nvarchar, 20.123) as StringData
  
  

  Result :

  +---+---------------+
  |   | StringData    |
  +---+---------------+
  | 1 | 20.123        |
  +---+---------------+
  
  

• Convert an Integer Number to a Decimal Number :

  SELECT  CONVERT(DECIMAL (15,3), 13) as DecimalNumber
  
  

  Result :

  +---+---------------+
  |   | DecimalNumber |
  +---+---------------+
  | 1 | 13.000        |
  +---+---------------+
  
  

• Convert a String to Date Format in USA Date Style :

  SELECT  CONVERT(DATE, '20171030' , 110) To_USA_DateFormat
  
  

  Result :

  +---+-------------------+
  |   | To_USA_DateFormat |
  +---+-------------------+
  | 1 | 2017-10-30        |
  +---+-------------------+
  
  

More Information:

• Information on Convert function: Microsoft