t:([]date:enlist 2014.01.01;TypeA:enlist `A;TypeB:enlist `B;TypeC:enlist `C;Agg:enlist `ABC)
t2:([]header1:`TypeA`TypeB`TypeC;Header2:`X`Y`Z)
t uj enlist (!) . value flip t2
date TypeA TypeB TypeC Agg
--------------------------------
2014.01.01 A B C ABC
X Y Z