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  1.Ê×ÏȵöÔmysql ÀïÃæµÄ²ÎÊý½øÐнéÉÜÏÂ:
     procedure--in:ÊäÈë²ÎÊý,outÊä³ö²ÎÊý,inoutÕâ¸ö¾Í²»ÓÃ˵ÁË,´ó¸ÅÒ²²Âµ½ÁË
                       declare:ÉùÃ÷±äÁ¿.¼ÇÖ÷,ËùÓÐÉùÃ÷±ØÐëÔÚ·ÇÉùÃ÷Óï¾äÇ°Íê³É,·ñÔò»á±¨´í
   2.mysql ³£Óú¯Êý½éÉÜ:
       *.concat('s','a',5) ¿ÉÒÔÄÇÊýֵת»»³É×Ö·û´®,Ò²¿ÉÒÔ½øÐÐ×Ö·û´®µÄºÏ²¢
            Èç:set str=concat('asd','ad',56)  ----> str='asdad56'
                declare num in;set num=156;set @ste=concat('',num)|(num);-->@str='156'
                mysql> select CONCAT('My', NULL, 'QL');
¡¡¡¡            -> NULL
      *.ASCII(str),·µ»Ø×Ö·û´®strµÄµÚÒ»¸ö×Ö·ûµÄASCIIÖµ(strÊÇ¿Õ´®Ê±·µ»Ø0)
            Èç:mysql> select ASCII('2');-> 50
      *.CONV(N,from_base,to_base),¶ÔÊý×ÖN½øÖÆת»»,²¢×ª»»Îª×Ö´®·µ»Ø(ÈκβÎÊýΪNULLʱ·µ»ØNULL,½øÖÆ·¶Î§Îª2-36ÖÆ,             µ±to_baseÊǸºÊýʱN×÷ΪÓзûºÅÊý·ñÔò×÷ÎÞ·ûºÅÊý,CONVÒÔ64λµã¾«¶È¹¤×÷)
           Èç:mysql> select CONV("a",16,2);
¡¡¡¡          -> '1010'
                mysql> select CONV(-17,10,-18);
¡¡¡¡          -> '-H'
                mysql> select CONV(10+"10"+'1


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