摘要：
DECLARE @USERROWS NVARCHAR(MAX) SET @USERROWS='' SET @USERROWS='wode' print LEN(@USERROWS) SET @USERROWS=SUBSTRING(@USERROWS,0,LEN(@USERROWS)) print @USERROWS --结果为 wod DECLARE @USERROWS NVARCHAR(MAX) SET @USERROWS='wode' SET @USERROWS=SUBSTRING(@USERROWS,1,LEN(@USERROWS)-1) 阅读全文