@ -6,27 +6,27 @@ category: "Product"
menuTitle: "Primary value" menuTitle: "Primary value"
--- ---
## What is a ` Primary Value` ## What is a Primary Value ?
- Primary value as the name stands is the primary or main value within a row of a table that you generally associate that row with. - Primary value as the name stands is the primary or main value within a row of a table that you generally associate that row with.
- It should be usually associated with a column which is uniquely identifiable. However, this uniqueness is not enforced at the database level. - It should be usually associated with a column which is uniquely identifiable. However, this uniqueness is not enforced at the database level.
## What is the use of ` Primary Value` ## What is the use of Primary Value ?
- Within a spreadsheet, primary value are always highlighted so that it is easier to recognise what row we are in. - Within a spreadsheet, primary value are always highlighted so that it is easier to recognise what row we are in.
- And when LinkToAnotherRecord is created between two tables - it is the primary value that appears in LinkToAnotheRecord column. - And when LinkToAnotherRecord is created between two tables - it is the primary value that appears in LinkToAnotheRecord column.
#### Example : ```Primary value``` highlighted in actor table #### Example : Primary Value highlighted in actor table
< img width = "547" alt = "actor" src = "https://user-images.githubusercontent.com/5435402/152645708-92b83985-4a0a-42b2-9d01-d26be70fd3aa.png" > < img width = "547" alt = "actor" src = "https://user-images.githubusercontent.com/5435402/152645708-92b83985-4a0a-42b2-9d01-d26be70fd3aa.png" >
#### Example : ```Primary value``` highlighted in film table #### Example : Primary Value highlighted in film table
< img width = "1406" alt = "film-table" src = "https://user-images.githubusercontent.com/5435402/152645713-b4df99b2-4eb7-4fea-85f9-0baf47470ef3.png" > < img width = "1406" alt = "film-table" src = "https://user-images.githubusercontent.com/5435402/152645713-b4df99b2-4eb7-4fea-85f9-0baf47470ef3.png" >
#### Example : ```Primary value``` associated when ```LinkToAnotherRecord``` is created #### Example : Primary Value associated when LinkToAnotherRecord is created
< img width = "753" alt = "actor-film" src = "https://user-images.githubusercontent.com/5435402/152645714-4061c94a-4cfb-44e5-b112-63cf4ed869fe.png" > < img width = "753" alt = "actor-film" src = "https://user-images.githubusercontent.com/5435402/152645714-4061c94a-4cfb-44e5-b112-63cf4ed869fe.png" >
## How is ```Primary value``` identfied for existing database tables ? ## How is Primary Value identfied for existing database tables ?
- It is usually the first column after the primary key which is not a number. - It is usually the first column after the primary key which is not a number.
- If there is no column which is not a number then the column adjacent to primary key is chosen. - If there is no column which is not a number then the column adjacent to primary key is chosen.
## Can I change the ``` Primary Value``` to another column within tables ? ## Can I change the Primary Value to another column within tables ?
- Yes, you can. Hover over column which you want as primary column and click ```Set as Primary Value``` - Yes, you can. Hover over column which you want as primary column and click ```Set as Primary Value```
Wing-Kam Wong
3 years ago