Update link-to-another-record.md

Procedure for linking to another record (captured with example over Country, City table - depicting Country has-many cities relationship & City belongs-to country relationship)
3 years ago · 10cb0812bf
1 changed files with 55 additions and 1 deletions
--- a/packages/noco-docs/content/en/setup-and-usages/link-to-another-record.md
+++ b/packages/noco-docs/content/en/setup-and-usages/link-to-another-record.md
@ -6,4 +6,58 @@ category: 'Usage'
 menuTitle: 'Link To Another Record'
 ---

-> Todo
+### Relationship types:
+- One to one
+  - A Table record in first table is related to only one record of second table. 
+  - Example: Country has a capital city
+- One to many 
+  - A Table record in first table is related to more than one record of second table. But second table record maps to only one entry of first table
+  - NocoDB refers to this category of relationship as **has many**
+  - For every **has many** relation defined, NocoDB augments **belongs to** relationship column in the other table automatically
+  - Example: Country **has many** Cities. (other way mapping > City **belongs to** Country )
+- Many to many
+  - A Table record in first table is related to more than one record of second table; second table record can also map to more than on record of first table.
+  - NocoDB refers to this category of relationship as **many to many**
+  - For every **many to many** relation defined between tables, NocoDB augments **many to many** relationship column in the other table automatically
+  - Example: Film **has many** Actors. Actor **has many** Films (works on many films) 
+
+Further details of relationship types can be found [here](https://afteracademy.com/blog/what-are-the-different-types-of-relationships-in-dbms)
+
+Relationships between table records can be established by using **LinkToAnotherRecord** column type.
+Workflow details are captured below
+
+## Adding a relationship
+![1](https://user-images.githubusercontent.com/86527202/144224170-43f4194f-83d4-4291-8c91-1f66ea1caeda.png)
+
+#### 1. Create Column 
+Click on '+' button at end of column headers
+#### 2. Update Column Name
+Input name in the text box provided
+#### 3. Select Column Type
+Select Column type as "LinkToAnotherRecord" from the drop-down menu
+#### 4. Choose Relationship Type
+'Has Many': corresponds to the 'One-to-many' relationships
+'Many To Many': corresponds to the 'Many-to-many' relationships
+#### 5. Select Child Table from drop down menu
+#### 6. Click on Save
+A new column will get created in both the parent table & child table
+
+
+## Updating Linked records
+
+#### 1. Open link record tab
+Click on the '+' icon in corresponding row - cell
+![2truncate](https://user-images.githubusercontent.com/86527202/144224728-1cba50e3-323e-4578-be48-d2a205fb472c.png)
+
+#### 2. Select from the option displayed
+Use 'Filter box' to narrow down on search items
+You can opt to insert a new record as well, using "+ New Record" button
+![3](https://user-images.githubusercontent.com/86527202/144224530-a258775f-1eea-4c79-88ed-a377d1e35a26.png)
+
+#### 3. Column mapping showing "Has Many" relationship
+Country 'has many' City
+#### 4. Column mapping for "Belongs to" relationship [Automatically updated]
+City 'belongs to' Country
+![4](https://user-images.githubusercontent.com/86527202/144224542-d28be060-a077-468a-bdc4-b2e8a783d75f.png)
+
+