1.分类导航
一共分为5类函数
1. 字符型函数
2. 数值型函数
3. 日期型函数
4. 统计型函数
5. 其它型函数
2.字符型函数[约48个]
ascii(str) bin(n) bit_length(str) char(n,... [using charset]) character_length(str) char_length(str) compress(string_to_compress) concat_ws(separator,str1,str2,...) conv(n,from_base,to_base) elt(n,str1,str2,str3,...) export_set(bits,on,off[,separator[,number_of_bits]]) field(str,str1,str2,str3,...) find_in_set(str,strlist) hex(n_or_s) insert(str,pos,len,newstr) instr(str,substr) lcase(str) left(str,len) length(str) load_file(file_name) locate(substr,str) , locate(substr,str,pos) lower(str) lpad(str,len,padstr) ltrim(str) make_set(bits,str1,str2,...) mid(str,pos,len) oct(n) octet_length(str) ord(str) position(substr in str) quote(str) repeat(str,count) replace(str,from_str,to_str) reverse(str) right(str,len) rpad(str,len,padstr) rtrim(str) soundex(str) space(n) strcmp(expr1,expr2) substring(str,pos) , substring(str from pos) substring(str,pos,len) , substring(str from pos for len) substring_index(str,delim,count) trim([{both | leading | trailing} [remstr] from] str) trim(remstr from] str) ucase(str) uncompress(string_to_uncompress) uncompressed_length(compressed_string) unhex(str) upper(str)
3.数值型函数[约25个]
abs(x) acos(x) asin(x) atan(x) atan2(y,x) ceiling(x) ceil(x) cos(x) cot(x) crc32(expr) degrees(x) div exp(x) floor(x) log10(x) log2(x) mod(n,m) , n % m n mod m pi() pow(x,y) , power(x,y) radians(x) rand() rand(n) round(x) round(x,d) sign(x) sin(x) sqrt(x) tan(x)
4.日期型函数[约65个]
adddate(date,interval expr type) adddate(expr,days) addtime(expr,expr2) convert_tz(dt,from_tz,to_tz) curdate() current_date() current_time() current_timestamp() curtime() date(expr) datediff(expr,expr2) date_add(date,interval expr type) date_format(date,format) date_add(date,interval expr type) day(date) dayname(date) dayofweek(date) dayofyear(date) extract(type from date) dayofmonth(date) from_days(n) from_unixtime(unix_timestamp) from_unixtime(unix_timestamp,format) get_format(date|time|datetime, 'eur'|'usa'|'jis'|'iso'|'internal') hour(time) last_day(date) ln(x) localtime() localtimestamp() log(x) log(b,x) makedate(year,dayofyear) maketime(hour,minute,second) microsecond(expr) minute(time) month(date) monthname(date) now() period_add(p,n) period_diff(p1,p2) quarter(date) second(time) sec_to_time(seconds) str_to_date(str,format) subdate(date,interval expr type) subdate(expr,days) subtime(expr,expr2) sysdate() time(expr) timediff(expr,expr2) timestampadd(interval,int_expr,datetime_expr) timestampdiff(interval,datetime_expr1,datetime_expr2) time_format(time,format) time_to_sec(time) to_days(date) truncate(x,d) unix_timestamp() unix_timestamp(date) utc_date() utc_time() utc_timestamp() week(date[,mode]) weekday(date) weekofyear(date) year(date) yearweek(date) yearweek(date,start)
5.统计型函数[约14个]
avg([distinct] expr) bit_and(expr) bit_or(expr) bit_xor(expr) count(distinct expr,[expr...]) group_concat(expr) min([distinct] expr), max([distinct] expr) std(expr) stddev(expr) stddev_pop(expr) stddev_samp(expr) sum([distinct] expr) variance(expr) var_pop(expr) var_samp(expr)
6.其它型函数[约44个]
aes_encrypt(str,key_str) , aes_decrypt(crypt_str,key_str) benchmark(count,expr) binary bit_count(n) cast(expr as type), convert(expr,type) , convert(expr using transcoding_name) collation(str) connection_id() current_user() database() decode(crypt_str,pass_str) default(col_name) des_decrypt(crypt_str[,key_str]) des_encrypt(str[,(key_num|key_str)]) encode(str,pass_str) encrypt(str[,salt]) format(x,d) found_rows() get_lock(str,timeout) if(expr1,expr2,expr3) ifnull(expr1,expr2) inet_aton(expr) inet_ntoa(expr) isnull(expr) is_free_lock(str) is_used_lock(str) master_pos_wait(log_name,log_pos[,timeout]) md5(str) name_const(name,value) nullif(expr1,expr2) old_password(str) password(str) release_lock(str) row_count() schema() session_user() sha1(str) sha(str) sleep(duration) system_user() timestamp(expr) timestamp(expr,expr2) user() uuid() values(col_name) version()
转：https://blog.csdn.net/qq_15071263/article/details/79033856
参考：https://blog.csdn.net/sinat_38899493/article/details/78710482