i have a table with a numeric column (not the key column)
i want to obtain from this table a list of unique numbers appearing in that one 
column

some cells in the column may have nothing, some may have duplicate numbers eg:

> 1
> 1
> 1
> 4
> _
> _
> 4
> _

note that "_" means "no data".  i want to get a list with [1, 4] as the result. 
 what is the proper SQLite query for this?

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