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OracleºÍMSSQLÖÐÑ­»·µÄʹÓÃ


 ORACLE
CREATE OR REPLACE FUNCTION SETSTATE(OLDVALUE VARCHAR2, POS NUMBER, SVALUE VARCHAR2)
RETURN VARCHAR2
IS
RETURN_VALUE VARCHAR2 (20);
LEN NUMBER(8);
I NUMBER(8);
TEMP_VALUE VARCHAR2(1);
BEGIN
     LEN := LENGTH(OLDVALUE);
     IF POS > LEN THEN
        RETURN 'Ö¸¶¨µÄË÷Òý´óÓÚ×Ö·û´®µÄ³¤¶È£¡';
     END IF;
     I := 0;
     RETURN_VALUE := '';
     FOR I IN 1..LEN LOOP
         TEMP_VALUE := SUBSTR(OLDVALUE, I, 1);
         IF I = POS THEN
            TEMP_VALUE := SVALUE;
         END IF;
         RETURN_VALUE := RETURN_VALUE || TEMP_VALUE;
     END LOOP;
     RETURN RETURN_VALUE;
END;
MSSQL
IF EXISTS(SELECT * from SYSOBJECTS WHERE NAME = 'SETSTATE')
 DROP FUNCTION SETSTATE
GO
CREATE FUNCTION SETSTATE(@OLDVALUE NVARCHAR(20), @POS INT, @SVALUE NVARCHAR(1))
RETURNS NVARCHAR(20)
AS
BEGIN
 DECLARE @RETURN_VALUE NVARCHAR(20),
 @LENGTH INT,
 @I INT,
 @TEMP_VALUE NVARCHAR(1);
 SET @LENGTH = LEN(@OLDVALUE);
 SET @I = 1;
 SET @RETURN_VALUE = '';
 IF(@POS > @LENGTH)
  SET @RETURN_VALUE = @OLDVALUE;
 ELSE
  BEGIN
   WHILE(@I <= @LENGTH)
   BEGIN
    SET @TEMP_VALUE = SUBSTRING(@OLDVALUE, @I, 1);
    IF (@I = @POS)
     SET @TEMP_VALUE = @SVALUE;
    SET @RETURN_VALUE = @RETURN_VALUE + @TEMP_VALUE;
    SET @I = @I + 1;
   END
  END
 RETURN @RETURN_VALUE;
END
GO


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oracle´óÊý¾ÝÁ¿µ¼È루sqllaoder)

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1.ASCII
·µ»ØÓëÖ¸¶¨µÄ×Ö·û¶ÔÓ¦µÄÊ®½øÖÆÊý;
SQL> select ascii('A') A,ascii('a') a,ascii('0') zero,ascii(' ') space from dual;
A A ZERO SPACE
--------- --------- --------- ---------
65 97 48 32
2.CHR
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ºÍÍøÓÑ̽ÌÖ ÈçºÎѧϰOracle

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Oracle µÄdrop table if exists¹¦ÄÜ

Oracle´´½¨±íʱ£¬³£Óöµ½ÏÈɾ³ýºó´´½¨µÄÇé¿ö£¬¶øËüÓÖûÓÐdrop table... if existsÓï·¨¡£Îª´Ë¿ÉÒÔʹÓÃuser_objectsÊý¾Ý×ÖµäºÍ¶¯Ì¬sqlÓï¾äʵÏÖÀàËÆµÄ¹¦ÄÜ£¬ÈçÏÂËùʾ£º
create or replace procedure proc_dropifexists(
    p_table in varchar2
) is
    v_count number(10);
begin
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