Re: How to manage null value while copy data from csv

On 31 Dec 2020, at 17:25, Sachin Kumar wrote:

> when I am uploading data (CSV File) using the COPY command. I am
> getting
> below mention error.
>
> ERROR: null value in column "adj_type" violates not-null constraint.
>
This indicates the relevant column in the database table has been
defined to **never** allow a NULL value.

> When I define null it gives no error message, but how to manage null
> value
> n data without defining it, because there is many more columns. when
> it
> defines null it gives an error if null value comes you are violating
> null.
>
What is meant by “define null”? Is this where you put a real value
in the CSV, or a dummy text value such as “null”?
You could massage the csv so all the gaps get a dummy value, then handle
this in the SQL table.

Otherwise
> Please suggest how to manage null value in postgresql?
>
Basic options
1. Fix the raw csv data so there are no gaps — the person who defined
the database wasn’t expecting any
2. Fix the database so it will accept NULL values — assuming this is
ok with the business model
3. Accept the csv data into a temporary table which tolerates NULL,
massage the data then insert into the real database

Regards
Gavan Schneider