子字符串sql server [重复]

Question

我想在 8 个字符后显示，如何通过substring 来实现。 联系人姓名为amjad habib，我想显示amjad hab...。

SELECT SUBSTRING(contractname, 1, 8)
from contracts
where contractid = 613

Answer 1

这会将您的字符串剪切到您可以指定的最大长度。仅在字符串过长并因此被截断的情况下才附加点。较短的字符串“按原样”显示：

DECLARE @tbl TABLE(TheName VARCHAR(100));
INSERT INTO @tbl VALUES('short'),('exactly8'),('something longer');

DECLARE @MaxLength INT=8;

SELECT TheName 
      ,LEFT(TheName,@MaxLength) + CASE WHEN LEN(TheName)>@MaxLength THEN '...' ELSE '' END AS CutToMaxLength 

FROM @tbl

结果

TheName               CutToMaxLength
short                 short
exactly8              exactly8
something longer      somethin...