sql语句精剪数据长度函数substring(string,int,int)

/****** SSMS 的 SelectTopNRows 命令的脚本  ******/
SELECT
      *
  FROM [Database].[dbo].[VideosTable]
  where len(ReleaseTime)>8;

  Update [Database].[dbo].[VideosTable] 
  set ReleaseTime=substring(ReleaseTime,5,8)
    where len(ReleaseTime)>8;