docs(noco-docs-prev): init commit

Signed-off-by: Wing-Kam Wong <wingkwong.code@gmail.com>

packages/noco-docs-prev/content/en/setup-and-usages/primary-value.md

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+---
+title: "Primary value"
+description: "Primary value"
+position: 575
+category: "Product"
+menuTitle: "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.
+- 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' ?
+- 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. 
+
+#### 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">
+
+#### 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">
+
+#### 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">
+
+
+## How is ```Primary value``` identfied for existing database tables ?
+- 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. 
+
+## 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```