The SQL Server COS()
function returns the cosine of a specified angle in radians. This function is useful for performing trigonometric calculations.
SELECT COS(angle);
The COS()
function takes a single argument:
angle
: The angle in radians for which to calculate the cosine.Let's look at some examples of SQL Server COS()
function queries:
SELECT COS(0) AS result;
This query returns the cosine of 0 radians. The result will be:
result
------
1.0
SELECT COS(PI()/2) AS result;
This query returns the cosine of π/2 radians (90 degrees). The result will be:
result
------
0.0
SELECT angle_value, COS(angle_value) AS cos_value
FROM angles;
This query returns the cosine of the angle_value
column for each record in the angles
table. The result will show the original angle_value
and its corresponding cosine as cos_value
.
DECLARE @angle FLOAT;
SET @angle = PI()/3;
SELECT COS(@angle) AS result;
This query uses a variable to store an angle and then returns its cosine. The result will be:
result
------
0.5
Let's go through a complete example that includes creating a table, inserting data, and using the COS()
function.
This step involves creating a new table named example_table
to store some sample data.
CREATE TABLE example_table (
id INT PRIMARY KEY,
angle_value FLOAT
);
In this example, we create a table named example_table
with columns for id
and angle_value
.
This step involves inserting some sample data into the example_table
.
INSERT INTO example_table (id, angle_value) VALUES (1, 0);
INSERT INTO example_table (id, angle_value) VALUES (2, PI()/2);
INSERT INTO example_table (id, angle_value) VALUES (3, PI()/3);
INSERT INTO example_table (id, angle_value) VALUES (4, PI());
Here, we insert data into the example_table
.
This step involves using the COS()
function to return the cosine of the angle_value
column.
SELECT id, angle_value, COS(angle_value) AS cos_value
FROM example_table;
This query retrieves the id
, angle_value
, and the cosine of the angle_value
column for each row in the example_table
. The result will be:
id angle_value cos_value
--- ------------ ---------
1 0 1.0
2 1.5707963268 0.0
3 1.0471975512 0.5
4 3.1415926536 -1.0
The SQL Server COS()
function is a powerful tool for returning the cosine of a specified angle in radians. Understanding how to use the COS()
function and its syntax is essential for effective trigonometric calculations and data processing in SQL Server.