SELECT stuff(stuff(RIGHT(REPLICATE('0',6)+CAST(UserTime AS varchar(10)),6),3,0,':'),6,0,':') from CmbUser
152346 变为 15:23:45
72856 变为 07:28:56
stuff('152346',3,0,':') 表示 再第三位开始,(0表示不删除数字) 不删除数字 插入‘:’
REPLICATE('0',6) 标识一共有多少位数 不够的前面补0
SELECT stuff(stuff(RIGHT(REPLICATE('0',8)+CAST(UserDate AS varchar(10)),8),5,0,'-'),8,0,'-') from CmbUser
20170812 变为2017-08-12