PI() function: π
Output is 3.141593
This is a mathematical constant (π) and the value displayed by MySQL is for 7 digits after decimal but internaly stores double-precision value of PI.
PI() with DEGREES()DEGREES function converts radian to degree.
PI with SIN() COS()We can get sine of any value in radians by using sin(), note that sin(x) takes input in redian. Value of x is in redian.
SELECT SIN(PI()); // Output is 1.2246467991473532e-16We can use use ROUND Function to rounds to output
SELECT ROUND(SIN(PI())); // Output is 0 SELECT ROUND(SIN(PI()/2)); // Output is 1We will allow some decimal places to be shown as the value of SIN varies between 0 and 1.
SELECT ROUND( SIN( PI( ) /3 ), 3 ) //Output is 0.866 SELECT ROUND( SIN( PI( ) /4 ) , 4 ) // Output is 0.7071We can try COS values
SELECT ROUND( COS( PI( ) /3 ), 3 ) //Output is 0.500 SELECT ROUND( COS( PI( ) /2 ), 3 ) // Output is 0.000
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