sql - 子字符串sql server

Question

我想显示8个字符后，如何通过substring做到这一点。 联系人姓名为amjad habib ，我要显示amjad hab... .

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

Answer 1

这会将字符串剪切到您可以指定的最大长度。仅当字符串太长而被截断时才会添加点。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...