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--SQL ½ØÈ¡×Ö·û´®·½·¨£¬ÖÐÎÄËãÁ½¸ö×Ö·ûµÄ·½·¨¡£
--·½·¨¸úË®¸çѧϰµÄ£¬Ö§³ÖÒ»ÏÂË®¸çµÄ²©¿Í
--http://hi.csdn.net/link.php?url=http://blog.csdn.net%2Fwufeng4552
--Ë®¸ç×î½üлÁ˺ö಩¿Í£¬ÓÐʱ¼äÒ»¶¨È¥ºÃºÃѧϰ
--LEFT() ºÍSUBSTRING()¶¼Êǽ«ºº×ÖËãÒ»¸ö×Ö·ûÀ´ËãµÄ
--Èç¹û²»¼Æ½ÏµÄ»°£¬ÍƼöʹÓÃÕâÁ½¸öϵͳº¯Êý
IF OBJECT_ID('TB')IS NOT NULL DROP TABLE TB
GO
CREATE TABLE tb (ID INT IDENTITY(1,1),VALUE NVARCHAR(100))
INSERT tb SELECT N'Öйúabcdefgh'
UNION ALL SELECT N'123 fsd——————'
UNION ALL SELECT N'ÖйúÈËÃñ'
UNION ALL SELECT N'ÊÇÖйúÈË£¬¶¼ÊÇÑ×»Æ×ÓË¶¼ÊÇÁúÈË´«ÈË'
go
----------------------------´´½¨º¯Êý-----------------------
IF OBJECT_ID('f_cut') IS NOT NULL DROP FUNCTION f_cut
GO
CREATE FUNCTION f_cut
(
@s NVARCHAR(50),--ÄãÒª½ØÈ¡µÄ×Ö·û´®
@i INT--½ØÈ¡µÄ³¤¶È
)
RETURNS NVARCHAR(50)
AS
BEGIN
DECLARE @j INT
DECLARE @a NVARCHAR(100)
SET @j=1
WHILE @j<=@i
  BEGIN
   IF UNICODE(SUBSTRING(@s,@j,1)) BETWEEN 19968 AND 40868
    BEGIN
     SET @i=@i-1
    
    END
     SET @j=@j+1
  END
RETURN LEFT(@s,@i)
END
GO
------------------²éѯ¿ªÊ¼---------------
SELECT id,dbo.f_cut([VALUE],10)from tb
-------------------½á¹û------------------
/*
(4 ÐÐÊÜÓ°Ïì)
id         
----------- ----------------------------
1           Öйúabcdef
2           123 fsd———
3           ÖйúÈËÃñ
4           ÊÇÖйúÈË£¬
(4 ÐÐÊÜÓ°Ïì)
*/


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select len('abc ')--3
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