What type of value does the single select have?
When the multiple values parameter is disabled for a select, it becomes a single select.
The user can choose only one value, and a single value is stored as the basis.
What is the value of the multiple select
When the select has the enabled parameter multiple values — it is a multiple select.
The user can select multiple values, and a list is stored as the basis.
If one value is selected, a list with one value will be stored.
What happens if you change a single select with values to a multiple select?
You will need to recount the rows in the table. Values are preserved.
What happens if you change a multiple select with values to a single select?
You will need to recount the rows in the table. Only one value in each row selected randomly by the machine will be saved.
If a multiple select value is taken with the select function, is it a single value or a list?
When you take a value from a multiple select through select — you get a list!
If you take selectList from multiple selects, you will get a list of lists.
To turn it into a single list, you will need to concatenate these lists one after another and possibly convert them to unique values (this depends on your task):
=: listUniq(list: $train)
train: listTrain(list: $selectlist)
selectlist: selectList(table: 'name'; field: 'multiply')