select floor(5.5),floor(-5.5);
floor(5.5)	floor(-5.5)
5	-6
select ceiling(5.5),ceiling(-5.5);
ceiling(5.5)	ceiling(-5.5)
6	-5
select truncate(52.64,1),truncate(52.64,2),truncate(52.64,-1),truncate(52.64,-2), truncate(-52.64,1),truncate(-52.64,-1);
truncate(52.64,1)	truncate(52.64,2)	truncate(52.64,-1)	truncate(52.64,-2)	truncate(-52.64,1)	truncate(-52.64,-1)
52.6	52.64	50	0	-52.6	-50
select round(5.5),round(-5.5);
round(5.5)	round(-5.5)
6	-6
select round(5.64,1),round(5.64,2),round(5.64,-1),round(5.64,-2);
round(5.64,1)	round(5.64,2)	round(5.64,-1)	round(5.64,-2)
5.6	5.64	10	0
select abs(-10), sign(-5), sign(5), sign(0);
abs(-10)	sign(-5)	sign(5)	sign(0)
10	-1	1	0
select log(exp(10)),exp(log(sqrt(10))*2),log(-1),log(NULL),log(1,1),log(3,9),log(-1,2),log(NULL,2);
log(exp(10))	exp(log(sqrt(10))*2)	log(-1)	log(NULL)	log(1,1)	log(3,9)	log(-1,2)	log(NULL,2)
10.000000	10.000000	NULL	NULL	NULL	2.000000	NULL	NULL
select ln(exp(10)),exp(ln(sqrt(10))*2),ln(-1),ln(0),ln(NULL);
ln(exp(10))	exp(ln(sqrt(10))*2)	ln(-1)	ln(0)	ln(NULL)
10.000000	10.000000	NULL	NULL	NULL
select log2(8),log2(15),log2(-2),log2(0),log2(NULL);
log2(8)	log2(15)	log2(-2)	log2(0)	log2(NULL)
3.000000	3.906891	NULL	NULL	NULL
select log10(100),log10(18),log10(-4),log10(0),log10(NULL);
log10(100)	log10(18)	log10(-4)	log10(0)	log10(NULL)
2.000000	1.255273	NULL	NULL	NULL
select pow(10,log10(10)),power(2,4);
pow(10,log10(10))	power(2,4)
10.000000	16.000000
select rand(999999),rand();
rand(999999)	rand()
0.014231365187309	0.8078568166195
select pi(),sin(pi()/2),cos(pi()/2),abs(tan(pi())),cot(1),asin(1),acos(0),atan(1);
PI()	sin(pi()/2)	cos(pi()/2)	abs(tan(pi()))	cot(1)	asin(1)	acos(0)	atan(1)
3.141593	1.000000	0.000000	0.000000	0.64209262	1.570796	1.570796	0.785398
select degrees(pi()),radians(360);
degrees(pi())	radians(360)
180	6.2831853071796