drop table if exists t1; select floor(5.5),floor(-5.5); floor(5.5) floor(-5.5) 5 -6 explain extended select floor(5.5),floor(-5.5); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select floor(5.5) AS `floor(5.5)`,floor(-(5.5)) AS `floor(-5.5)` select ceiling(5.5),ceiling(-5.5); ceiling(5.5) ceiling(-5.5) 6 -5 explain extended select ceiling(5.5),ceiling(-5.5); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select ceiling(5.5) AS `ceiling(5.5)`,ceiling(-(5.5)) AS `ceiling(-5.5)` 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 explain extended 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); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select truncate(52.64,1) AS `truncate(52.64,1)`,truncate(52.64,2) AS `truncate(52.64,2)`,truncate(52.64,-(1)) AS `truncate(52.64,-1)`,truncate(52.64,-(2)) AS `truncate(52.64,-2)`,truncate(-(52.64),1) AS `truncate(-52.64,1)`,truncate(-(52.64),-(1)) AS `truncate(-52.64,-1)` select round(5.5),round(-5.5); round(5.5) round(-5.5) 6 -6 explain extended select round(5.5),round(-5.5); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select round(5.5,0) AS `round(5.5)`,round(-(5.5),0) AS `round(-5.5)` 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 explain extended select abs(-10), sign(-5), sign(5), sign(0); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select abs(-(10)) AS `abs(-10)`,sign(-(5)) AS `sign(-5)`,sign(5) AS `sign(5)`,sign(0) AS `sign(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 10 NULL NULL NULL 2 NULL NULL explain extended 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); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select log(exp(10)) AS `log(exp(10))`,exp((log(sqrt(10)) * 2)) AS `exp(log(sqrt(10))*2)`,log(-(1)) AS `log(-1)`,log(NULL) AS `log(NULL)`,log(1,1) AS `log(1,1)`,log(3,9) AS `log(3,9)`,log(-(1),2) AS `log(-1,2)`,log(NULL,2) AS `log(NULL,2)` 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 10 NULL NULL NULL explain extended select ln(exp(10)),exp(ln(sqrt(10))*2),ln(-1),ln(0),ln(NULL); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select ln(exp(10)) AS `ln(exp(10))`,exp((ln(sqrt(10)) * 2)) AS `exp(ln(sqrt(10))*2)`,ln(-(1)) AS `ln(-1)`,ln(0) AS `ln(0)`,ln(NULL) AS `ln(NULL)` select log2(8),log2(15),log2(-2),log2(0),log2(NULL); log2(8) log2(15) log2(-2) log2(0) log2(NULL) 3 3.9068905956085 NULL NULL NULL explain extended select log2(8),log2(15),log2(-2),log2(0),log2(NULL); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select log2(8) AS `log2(8)`,log2(15) AS `log2(15)`,log2(-(2)) AS `log2(-2)`,log2(0) AS `log2(0)`,log2(NULL) AS `log2(NULL)` select log10(100),log10(18),log10(-4),log10(0),log10(NULL); log10(100) log10(18) log10(-4) log10(0) log10(NULL) 2 1.2552725051033 NULL NULL NULL explain extended select log10(100),log10(18),log10(-4),log10(0),log10(NULL); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select log10(100) AS `log10(100)`,log10(18) AS `log10(18)`,log10(-(4)) AS `log10(-4)`,log10(0) AS `log10(0)`,log10(NULL) AS `log10(NULL)` select pow(10,log10(10)),power(2,4); pow(10,log10(10)) power(2,4) 10 16 explain extended select pow(10,log10(10)),power(2,4); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select pow(10,log10(10)) AS `pow(10,log10(10))`,pow(2,4) AS `power(2,4)` set @@rand_seed1=10000000,@@rand_seed2=1000000; select rand(999999),rand(); rand(999999) rand() 0.014231365187309 0.028870999839968 explain extended select rand(999999),rand(); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select sql_no_cache rand(999999) AS `rand(999999)`,rand() AS `rand()` select pi(),format(sin(pi()/2),6),format(cos(pi()/2),6),format(abs(tan(pi())),6),format(cot(1),6),format(asin(1),6),format(acos(0),6),format(atan(1),6); pi() format(sin(pi()/2),6) format(cos(pi()/2),6) format(abs(tan(pi())),6) format(cot(1),6) format(asin(1),6) format(acos(0),6) format(atan(1),6) 3.141593 1.000000 0.000000 0.000000 0.642093 1.570796 1.570796 0.785398 explain extended select pi(),format(sin(pi()/2),6),format(cos(pi()/2),6),format(abs(tan(pi())),6),format(cot(1),6),format(asin(1),6),format(acos(0),6),format(atan(1),6); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select pi() AS `pi()`,format(sin((pi() / 2)),6) AS `format(sin(pi()/2),6)`,format(cos((pi() / 2)),6) AS `format(cos(pi()/2),6)`,format(abs(tan(pi())),6) AS `format(abs(tan(pi())),6)`,format((1 / tan(1)),6) AS `format(cot(1),6)`,format(asin(1),6) AS `format(asin(1),6)`,format(acos(0),6) AS `format(acos(0),6)`,format(atan(1),6) AS `format(atan(1),6)` select degrees(pi()),radians(360); degrees(pi()) radians(360) 180 6.2831853071796 SELECT ACOS(1.0); ACOS(1.0) 0 SELECT ASIN(1.0); ASIN(1.0) 1.5707963267949 SELECT ACOS(0.2*5.0); ACOS(0.2*5.0) 0 SELECT ACOS(0.5*2.0); ACOS(0.5*2.0) 0 SELECT ASIN(0.8+0.2); ASIN(0.8+0.2) 1.5707963267949 SELECT ASIN(1.2-0.2); ASIN(1.2-0.2) 1.5707963267949 explain extended select degrees(pi()),radians(360); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 select degrees(pi()) AS `degrees(pi())`,radians(360) AS `radians(360)` select rand(rand); ERROR 42S22: Unknown column 'rand' in 'field list'