Обсуждение: sum of numeric column

On 12/9/20 4:46 PM, avi Singh wrote:
> I have a table structure and want to do a sum of column type i.e 
> numeric. How can I do it ? when i try sum function i get this error

You don't have a numeric type you have a numeric array type.

> 
> ERROR:  function sum(numeric[]) does not exist

Hence the error above.

> 
> Can anyone please help me with this ?

What do you want to do with the array?

> 
>             Column           |           Type           | Collation | 
> Nullable | Default
> ----------------------------+--------------------------+-----------+----------+---------
>   grid_id                    | bigint                   |           | 
> not null |
>   as_of_date                 | date                     |           | 
> not null |
>   cell_id                    | bigint                   |           | 
> not null |
>   last_event_timestamp_local | timestamp with time zone |           |   
>         |
>   last_event_id              | bigint                   |           |   
>         |
>   column_id                  | bigint                   |           |   
>         |
>   column_name                | character varying(50)    |           |   
>         |
>   row_id                     | bigint                   |           |   
>         |
>   data_type_id               | smallint                 |           |   
>         |
>   data_numeric               | numeric[]                |           |   
>         |
>   data_string                | character varying[]      |           |   
>         |
> 
> e.g. of values in numeric type column
> 
>   data_numeric
> --------------
>   {2.0}
>   {1.0}
> 
> Regards
> Prabhjot


-- 
Adrian Klaver
adrian.klaver@aklaver.com

On 12/9/20 5:04 PM, avi Singh wrote:
> Thanks for your reply Adrian
> 
> 
> What do you want to do with the array?
> i want to do a sum of the values of numeric array type column e.g. below
> data_numeric
> --------------
>   {2.0}
>   {1.0}

If you are going to have a single element arrays only then why not just 
use a numeric field?

To answer question:

select sum(data_numeric[1]) from some_table;

If you are going to have multi-element arrays then there are more questions:

1) Do you want sum horizontal in array?

2) If 1) then also vertical in column?

3) Do you want sum in 'columns' of arrays?

4) If 3) then what about missing data?

> 
> 
> (4 rows)
> 
> 
> 
> Regards
> 
> 



-- 
Adrian Klaver
adrian.klaver@aklaver.com