SQL怎么计算某列有多少个字符

SQL如何计算某列有多少个字符？
我想找出某列的   3-5个字符的   那些行。怎么办？
谢谢


[解决办法]
select * from yourTable where len(yourColumn) > 3 and len(yourColumn) <5
[解决办法]
select * from # where len(col) between 3 and 5
[解决办法]
select 列名=[name]
from syscolumns
where object_name(id)= '表名 ' and length between 3 and 5
[解决办法]
想找出某列的 3-5个字符的 那些行

select substring(col,3,3) from tb
[解决办法]
select * from # where len(col) between 3 and 5