abs(N)?返回N的絕對(duì)值

mysql> select ABS(2);

-> 2

mysql> select ABS(-32);

-> 32

sign(N)?返回參數(shù)的符號(hào)(為-1、0或1)

mysql> select SIGN(-32);

-> -1

mysql> select SIGN(0);

-> 0

mysql> select SIGN(234);

-> 1

mod(N,M)?取模運(yùn)算,返回N被M除的余數(shù)(同%操作符)

mysql> select MOD(234, 10);

-> 4

mysql> select 234 % 10;

-> 4

mysql> select MOD(29,9);

-> 2

floor(N)?返回不大于N的最大整數(shù)值

mysql> select FLOOR(1.23);

-> 1

mysql> select FLOOR(-1.23);

-> -2

ceiling(N)?返回不小于N的最小整數(shù)值

mysql> select CEILING(1.23);

-> 2

mysql> select CEILING(-1.23);

-> -1

round(N, D)?返回N的四舍五入值,保留D位小數(shù)(D的默認(rèn)值為0)

mysql> select ROUND(-1.23);

-> -1

mysql> select ROUND(-1.58);

-> -2

mysql> select ROUND(1.58);

-> 2

mysql> select ROUND(1.298, 1);

-> 1.3

mysql> select ROUND(1.298, 0);

-> 1

exp(N)返回值e的N次方(自然對(duì)數(shù)的底)

mysql> select EXP(2);

-> 7.389056

mysql> select EXP(-2);

-> 0.135335

log(N)?返回N的自然對(duì)數(shù)

mysql> select LOG(2);

-> 0.693147

mysql> select LOG(-2);

-> NULL

log10(N)?返回N以10為底的對(duì)數(shù)

mysql> select LOG10(2);

-> 0.301030

mysql> select LOG10(100);

-> 2.000000

mysql> select LOG10(-100);

-> NULL

pow(X,Y)或power(X,Y)?返回值X的Y次冪

mysql> select POW(2,2);

-> 4.000000

mysql> select POW(2,-2);

-> 0.250000

sqrt(N)?返回非負(fù)數(shù)N的平方根

mysql> select SQRT(4);

-> 2.000000

mysql> select SQRT(20);

-> 4.472136

pi()?返回圓周率

mysql> select PI();

-> 3.141593

cos(N)?返回N的余弦值

mysql> select COS(PI());

-> -1.000000

sin(N)?返回N的正弦值

mysql> select SIN(PI());

-> 0.000000

tan(N)?返回N的正切值

mysql> select TAN(PI()+1);

-> 1.557408

acos(N)?返回N反余弦(N是余弦值,在-1到1的范圍,否則返回NULL)

mysql> select ACOS(1);

-> 0.000000

mysql> select ACOS(1.0001);

-> NULL

mysql> select ACOS(0);

-> 1.570796

asin(N) ?返回N反正弦值

mysql> select ASIN(0.2);

-> 0.201358

mysql> select ASIN('foo');

-> 0.000000

atan(N)?返回N的反正切值

mysql> select ATAN(2);

-> 1.107149

mysql> select ATAN(-2);

-> -1.107149

atan2(X,Y)?返回2個(gè)變量X和Y的反正切(類(lèi)似Y/X的反正切,符號(hào)決定象限)

mysql> select ATAN(-2,2);

-> -0.785398

mysql> select ATAN(PI(),0);

-> 1.570796

cot(N)?返回X的余切

mysql> select COT(12);

-> -1.57267341

mysql> select COT(0);

-> NULL

RAND()或RAND(N)?返回在范圍0到1.0內(nèi)的隨機(jī)浮點(diǎn)值(可以使用數(shù)字N作為初始值)

mysql> select RAND();

-> 0.5925

mysql> select RAND(20);

-> 0.1811

mysql> select RAND(20);

-> 0.1811

mysql> select RAND();

-> 0.2079

mysql> select RAND();

-> 0.7888

degrees(N)?把N從弧度變換為角度并返回

mysql> select DEGREES(PI());

-> 180.000000

radians(N)?把N從角度變換為弧度并返回

mysql> select RADIANS(90);

-> 1.570796

truncate(N,D)?保留數(shù)字N的D位小數(shù)并返回

mysql> select TRUNCATE(1.223,1);

-> 1.2

mysql> select TRUNCATE(1.999,1);

-> 1.9

mysql> select TRUNCATE(1.999,0);

-> 1

least(X,Y,...) ?返回最小值(如果返回值被用在整數(shù)(實(shí)數(shù)或大小敏感字串)上下文或所有參數(shù)都是整數(shù)(實(shí)數(shù)或大小敏感字串)則他們作為整數(shù)(實(shí)

數(shù)或大小敏感字串)比較,否則按忽略大小寫(xiě)的字符串被比較)

mysql> select LEAST(2,0);

-> 0

mysql> select LEAST(34.0,3.0,5.0,767.0);

-> 3.0

mysql> select LEAST("B","A","C");

-> "A"

greatest(X,Y,...)?返回最大值(其余同LEAST())

mysql> select GREATEST(2,0);

-> 2

mysql> select GREATEST(34.0,3.0,5.0,767.0);

-> 767.0

mysql> select GREATEST("B","A","C");

-> "C"

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