# Who can explain what the unique identifier is exactly? **URL:** \ **Category:** Ask for Help\ **Created:** [August 3, 2022, 11:39am UTC](https://community.glideapps.com/t/who-can-explain-what-the-unique-identifier-is-exactly/45855 "2022-08-03T11:39:05Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![Jeff\_Hager](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/jeff_hager/32/43_2.png) [@Jeff\_Hager](https://community.glideapps.com/u/Jeff_Hager)\ **Post date:** [August 3, 2022, 12:58pm UTC](https://community.glideapps.com/t/who-can-explain-what-the-unique-identifier-is-exactly/45855/4 "2022-08-03T12:58:46Z")
Just to throw a couple of examples out there. One is in the post below. It’s a little complicated, but basically I’m setting a unique ID in a row, then I assign that unique ID to rows in another table via a list whenever a row is clicked. I do this to indicate that the row is “selected”. Instead of clearing the unique id from multiple rows, I simply change the unique id in the parent table which essentially resets all other rows. Hopefully the post makes more sense when you read it. > [@Reset Multiple Rows At Once](https://community.glideapps.com/t/reset-multiple-rows-at-once/22211): > > There have been several requests for people to find a way to clear a value in multiple rows. I was thinking about that and came up with a quick example of a way to handle that. Instead of trying to clear a value in an entire column, I realized we could just change one value on a parent column, load it as a single value in our sheet and then compare that parent value to a column that we set or unset for each row. It’s not about clearing an entire column, it’s about making a value in each row n… Another real world example…at my day job I sometimes work with mapping software. Every single piece of farmable land in the United States has a shape that outlines it’s borders. There’s upwards of 100 million individual pieces of land (shapes). In the data that we receive from the government, each row is a shape and each shape has a unique ID. They call it a CLU, but it’s really a GUID (or a unique ID). It’s simply a unique value that can be assigned without having to compare to an existing database of ID’s to check if it’s a duplicate. It will always be unique. The odds of ever getting a duplicate ID are astronomically high and very very unlikely to happen. --- _[View the full topic](https://community.glideapps.com/t/who-can-explain-what-the-unique-identifier-is-exactly/45855)._