Merge pull request #7 from bkamins/add_all_and_between

Add All and Between from IndexedTables.jl

Author: quinnj

src/DataAPI.jl

@@ -73,4 +73,22 @@ definition.
 """
 function describe end
 
+"""
+    Between(first, last)
+Select the columns between `first` and `last` from a table.
+"""
+struct Between{T1 <: Union{Int, Symbol}, T2 <: Union{Int, Symbol}}
+    first::T1
+    last::T2
+end
+
+"""
+    All(cols...)
+Select the union of the selections in `cols`. If `cols == ()`, select all columns.
+"""
+struct All{T<:Tuple}
+    cols::T
+    All(args...) = new{typeof(args)}(args)
+end
+
 end # module