Sorry, I am now sure what I am asking for, but anyway, if anyone may have or know the way of doing it.
I am new in Odoo. I want Odoo 8 database tables ER diagram. I know there are about 600 tables for Odoo. But I do not know how to get the ER diagram?
Can anyone please help?
You can use a free Odoo module, Entity Relationship Diagram (ERD) Maker, which is currently available for versions 8, 9, & 10. It's relatively basic as far as the information provided, but it is easy to install and use.
If you need something more robust, then I would suggest installing and using schemaspy. You can see some usage info on this related question/answer. This has a bit more setup involved and it takes longer to run (1-2 hours for as large/complicated as Odoo's database structure is), but it is able to produce extremely detailed diagrams and results in a great browse-able, local website with about all the information you could want.
You can find here the ERD for Odoo12 https://soft-builder.com/odoo-data-model-by-erbuilder/
