# Store only when tags change **URL:** \ **Category:** Ignition\ **Created:** [November 16, 2012, 1:29pm UTC](https://forum.inductiveautomation.com/t/store-only-when-tags-change/5435 "2012-11-16T13:29:24Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Sergio.Estevez](https://avatars.discourse-cdn.com/v4/letter/s/ea666f/32.png) [@Sergio.Estevez](https://forum.inductiveautomation.com/u/Sergio.Estevez)\ **Post date:** [November 16, 2012, 1:29pm UTC](https://forum.inductiveautomation.com/t/store-only-when-tags-change/5435/1 "2012-11-16T13:29:24Z")
Hi Guys! I need help with the transaction groups. I have 1500 tags and I want to create a table that historize every time that the value of the tags changes. I know that I can do it in 1500 different transaction groups, but is there another way to do it? I don’t know if it is possible but I would like to historize them in the same table in the same column. Could someone please help me? Thank you! ---
**Author:** ![Travis.Cox](https://avatars.discourse-cdn.com/v4/letter/t/b9bd4f/32.png) [@Travis.Cox](https://forum.inductiveautomation.com/u/Travis.Cox)\ **Post date:** [November 16, 2012, 3:53pm UTC](https://forum.inductiveautomation.com/t/store-only-when-tags-change/5435/2 "2012-11-16T15:53:29Z")
You can use the block data group to do this. You would make a block group for each data type: one for floats, one for integers, etc. The block group has a built-in feature to only insert changed rows and it puts data into a tall format not a wide format. Each group can use the same table and column if you want. As a note you will probably also want a block item in each group that identified each row with a name of the tag or something hardcoded. Here is some more information on the block group: [inductiveautomation.com/supp … \_group.htm](http://www.inductiveautomation.com/support/usermanuals/ignition/block_group.htm)