The SQL Server POWER()
function returns the value of a number raised to the power of another number. This function is useful for performing exponential calculations.
SELECT POWER(base, exponent);
The POWER()
function takes two arguments:
base
: The base number to be raised to a power.exponent
: The exponent to which the base number is raised.Let's look at some examples of SQL Server POWER()
function queries:
SELECT POWER(2, 3) AS result;
This query returns the value of 2 raised to the power of 3. The result will be:
result
------
8
SELECT POWER(5, -2) AS result;
This query returns the value of 5 raised to the power of -2. The result will be:
result
------
0.04
SELECT base, exponent, POWER(base, exponent) AS power_value
FROM calculations;
This query returns the value of the base
column raised to the power of the exponent
column for each record in the calculations
table. The result will show the original base
, exponent
, and power_value
for each calculation.
DECLARE @base FLOAT, @exponent FLOAT;
SET @base = 10;
SET @exponent = 2;
SELECT POWER(@base, @exponent) AS result;
This query uses variables to store the base and exponent values and then returns the result of raising the base to the power of the exponent. The result will be:
result
------
100
Let's go through a complete example that includes creating a table, inserting data, and using the POWER()
function.
This step involves creating a new table named calculations
to store some sample data.
CREATE TABLE calculations (
id INT PRIMARY KEY,
base FLOAT,
exponent FLOAT
);
In this example, we create a table named calculations
with columns for id
, base
, and exponent
.
This step involves inserting some sample data into the calculations
table.
INSERT INTO calculations (id, base, exponent) VALUES (1, 2, 3);
INSERT INTO calculations (id, base, exponent) VALUES (2, 5, -2);
INSERT INTO calculations (id, base, exponent) VALUES (3, 10, 2);
INSERT INTO calculations (id, base, exponent) VALUES (4, 7, 0.5);
Here, we insert data into the calculations
table.
This step involves using the POWER()
function to return the result of raising the base
column to the power of the exponent
column.
SELECT id, base, exponent, POWER(base, exponent) AS power_value
FROM calculations;
This query retrieves the id
, base
, exponent
, and the calculated power_value
for each row in the calculations
table. The result will be:
id base exponent power_value
--- ----- --------- ------------
1 2 3 8
2 5 -2 0.04
3 10 2 100
4 7 0.5 2.6457513110645906
The SQL Server POWER()
function is a powerful tool for returning the value of a number raised to the power of another number. Understanding how to use the POWER()
function and its syntax is essential for effective exponential calculations and data processing in SQL Server.