Display ALL keys in dataset

Question

I created a dateset (estimates) with 25 keys (my columns), and about a hundred rows. I'd like to be able to list the keys from the dataset.

I did this:

estimates[Keys]

which returned:

I also tried:

estimates[1]

which returned:

How can I display the entire list of keys?

My code is below:

Module[
{fileTemp, header, data}, 
fileTemp = Import[NotebookDirectory[] <> "test.xlsx", {"Sheets", "estimates"}];
header = fileTemp[[1]];
data = fileTemp[[2 ;;]];
estimates = Dataset@Map[AssociationThread[header, #] &]@data;

]

The following is part of the Excel sheet:

Answer 1

You can simply do:

titanic = ExampleData[{"Dataset", "Titanic"}];

Then:

titanic[1, Keys]

OR

Query[1, Keys] @ titanic 

You can convert to List with Normal e.g.:

titanic[1, Keys] // Normal

{"class", "age", "sex", "survived"}

Another variation:

Normal @ Keys @ titanic[[1]]

Answer 2

To get all Keys for a Dataset named dataset, where the first entry doesn't include all Keys

dataset[Keys /* Flatten /* Union] // Normal

will reveal all Keys, except those of nested Associations

Answer 3

On the example Datasets in the documentation dataset[Keys] fails with an error, but I believe you can use this:

titanic = ExampleData[{"Dataset", "Titanic"}];

titanic // First // Keys // Normal

{"class", "age", "sex", "survived"}

I should have emphasized that the most important function here is Normal, which will convert output to a standard List. This prevents the automatic formatting used for Dataset from truncating your output, and also lets it be handled as a common list by other functions.