/datum/database/database/query/proc/Columns(column)
Arguments:
column: Optional, the numbered column to read from
Returns:
A /list of column names for the current query
The column name of the provided numbered column

Once a query has started being read (after /database/query/proc/Execute() has been called), the column names can be retrieved using this proc.

query.Add("CREATE TABLE example (id int, name string, foo string, bar string)")
query.Execute(db)

query.Add("SELECT * FROM example")
query.Execute(db)

var/columns = query.Columns() // "id", "name", "foo", "bar"
var/specific_column = query.Columns(0) // "id"
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