SQL list only unique / distinct values

Question

I have a table which contains geometry lines (ways).There are lines that have a unique geometry (not repeating) and lines which have the same geometry (2,3,4 and more). I want to list only unique ones. If there are, for example, 2 lines with the same geometry I want to drop them. I tried DISTINCT but it also shows the first result from duplicated lines. I only want to see the unique ones. I tried window function but I get similar result (I get a counter on first line from the duplicating ones). Sorry for a newbie question but I'm learning :) Thanks!

Example:

way|
1  |
1  |
2  |
3  |
3  |
4  |

Result should be:

way|
2  |
4  |

That actually worked. Thanks a lot. I also have other tags in this table for every way (name, ref and few other tags) When I add them to the query I loose the segregation.

select count(way), way, name 
from planet_osm_line 
group by way, name 
having count(way) = 1;

Without "name" in the query I get all unique values listed but I want to keep "name" for every line. With this example I stilll get all the lines in the table listed.

Answer 1

To expound on @Nithila answer:

select count(way), way
from your_table
group by way
having count(way) = 1;