mysql's built-in functions

mysql built-in function 
    <1> char_length (...) - Calculation of the string length 
        EG: SELECT CHAR_LENGTH ( 'Star') --4 
    <2> the concat ( 'Star', 'comeup', 'shta') - string concatenation 
        EG: SELECT the concat ( 'Star', 'comeup', 'shta') --starcomeupshta 
    <. 3> CONV () - hex conversion 
        eg: select conv ( 'a' , 16,2) --1010 
    <. 4> the format () 
        EG: SELECT the format (11224.9,4) --11,224.9000 

    <. 5> iNSERT str inserted position specified character 
        eg: select insert ( 'star' , 1,1, 'w'); --- wtar 
            INSERT SELECT ( 'Star', 2,2 &, 'SW'); --- sswr 
            SELECT INSERT ( 'Star', 3,2-, 'MK'); --- STMK. 
            SELECT INSERT ( 'Star', 4,2 , 'lo');---stalo
            select insert('star',2,2,'good'); --- sgoodr
             INSERT SELECT ( 'Star', 2,2 &, 'G'); ---- SGR 
    <. 6> InStr () to find the location of characters in the string; 
            EG: SELECT InStr ( 'Star', 'A'); . 3 ---- 
    <. 7> left (); obtaining the first few characters 
        EG: SELECT left ( 'Star', 2); --- ST 
    <. 8> right (); after obtaining several characters 
        eg: select right ( 'Star', 2) -Ar 
    <. 9> the substring () taken from several locations beginning several 
        EG: SELECT the substring ( 'Star', 2,2 &); --- TA 
           SELECT the substring ( 'iamasuperbboy',. 5 ); --- superbboy 
           SELECT the substring ( 'iamasuperbboy' from. 5); --- superbboy 
           SELECT the substring ( 'iamasuperbboy', 5,6); --- Superb 
           SELECT the substring ( 'Star', - 2); --- Ar 
           SELECT the substring ( 'iamasuperbboy '- 5.3); --- rbb
           the substring SELECT ( 'for iamasuperbboy'from -5. 3); --- RBB 
    <10> LTRIM () remove the white space left 
    <11> rtrim () to the right of the blank is removed 
    <12> locate () Gets sequence index position 
        eg: select locate ( 'ar' , 'starstar', 1); --3 ( from a first position to find later) 
           SELECT the locate ( 'Ar', 'starstar',. 4); -. 7 (from 4th position looking onward) 
    <13 is> rEPEAT () is repeated several times in front of the string 
        EG: SELECT rEPEAT ( 'Star',. 5); --- starstarstarstarstar 
    <14> replace () replace 
        eg: select replace ( 'Star', 'TA', 'BG'); --- sbgr 
           SELECT Replace ( 'Star', 'TA', 'B'); --- SBR 
           SELECT Replace ( 'Star', 'TA', 'BGM '); sbgmr --- 
    <15> STRM () 
        EG:select trim (leading 'a' from 'aaaaaaaaaaasdm'); - sdm remove left 'a'
           select trim (both 'a' from 'aaaaaaaaaaasdmaaaaaaaaaaa'); --- sdm remove both sides of 'a' 
           SELECT TRIM (trailing 'a' from 'sdmaaaaaaaaaaa'); --- SDM removed right 'a'