MySQL built-in functions summary

One. String functions

Select concat (Name, "Age was", age) from users;   Insert (Str,x,y,insert)//Replace y position of string x position with insert  Select Lower (str) upper (str)//conversion caseSELECT * from user where upper (name) = ' AAA ';  left (str, x) Right (STR,X)//returns the X-characters on both sidesSelect Left ("Abcdee", 3), right ("Abcdedd", 3), left ("Abcdedd", null);  Lpad (Str,n,pad), Rpad (Str,n,pad)//using a string pad to fill n bits on the leftmost or rightmost side of STR  LTrim ()substring (str,x,y)//returns the X position of the string, taking Y characters    two. Numeric FunctionsABS (x)//returns the absolute value of xceil (x)//returns the smallest integer greater than xFloor (x)//returns the largest integer less than xmod (x, y) returns the film X/yrand ()//0-1 random number betweenround (x, y)//Returns the rounding of parameter x with a value of y decimal placetruncate (x, y)//Returns the result of the number x truncation of the y decimal place    three. Date functionuse PHP's timestamp to completeSelect Curdate ()curtime ()Now ()Unix_timestamp (now ())Unix_timestamp (date)//unix timestampfrom_unixtime ()//and UNIX timestamps convert each otherWeek ()Year ()Hour ()minute ()...         Select Now ()Select Unix_timestamp (now ())Select From_unixtiom (1293433835);Select From_unixtime ()Select Week (now ())Select Minute/hour (Curtime ())Select Data_format (now (), "%y-%m-%d%h%i%s")    four. Process Control functionsCREATE TABLE salary (ID int,salary decimal (9,2));INSERT into salary values (1,1000);***** if (value,t f)Select if (salary>3000, ' height ', ' low ') from salary;ifnull (value1,value2)Select Id,salary,ifnull (salary,0) from salaryCase When[value1] then[result1]...else[default] EndCase when ... thenSelect Case when salary<=300 and ' low ' else ' high ' end from salary;    Five. Other functionsdatabase ()Version ()//view the current version of the databaseUser ()//view current usersInet_aton (IP)//Return IP address of the network since sequencingInet_ntoa ()//Return the IP address of the network from the sequencing Representativepassword ()//string encryption, for MySQL system usersSelect password (' 123456 '); MD5 ()//Encrypt website usersSELECT * from Mysql.user \g;//view from MySQL Library user table

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MySQL built-in functions summary