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SQRT() Function in SQL Server

Last Updated : 30 Dec, 2020
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SQRT() function : This function in SQL Server is used to return the square root of a specified positive number. For example, if the specified number is 81, this function will return 9. Features :
  • This function is used to find the square root of a given number.
  • This function accepts only positive numbers.
  • This function also accepts fraction numbers.
  • This function always returns positive number.
  • This function use the formula " (a)1/2 = Returned value ", where a is the specified number.
Syntax :
SQRT(number)
Parameter : This method accepts a parameter as given below :
  • number : Specified positive number whose square root is going to be returned.
Returns : It returns the square root of a specified positive number. Example-1 : Getting the square root of the specified number 4.
SELECT SQRT(4);
Output :
2.0
Example-2 : Getting the square root of the specified number 0.
SELECT SQRT(0);
Output :
0.0
Example-3 : Using SQRT() function with a variable and getting the square root of the specified number 1.
DECLARE @Parameter_Value INT;
SET @Parameter_Value = 1;
SELECT SQRT(@Parameter_Value);
Output :
1.0
Example-4 : Getting the square root of 16 which is the result of "64/4".
SELECT SQRT(64/4);
Output :
4.0
Example-5 : Using SQRT() function with a variable and getting the square root of float value "4.7".
DECLARE @Parameter_Value FLOAT;
SET @Parameter_Value = 4.7;
SELECT SQRT(@Parameter_Value);
Output :
2.16794833886788
Application : This function is used to return the square root of a specified positive number.

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