Consider two aliases (T) and (U), loaded from data with schema defined below. I was considering a left outer join to 'merge' the two records, overriding those in U with the join fields in T, but the result isn't what I desired. Possibly a filter then union is required? I'm just not sure; looking for a quick way to get to this result (R):
R: ?[JOIN T BY (a,b,c,d) LEFT OUTER, U BY (a,b,c,d)]: schema : a,b,c,d,x,y a1 b1 c1 d1 *g1 h1* a2 b2 c2 d2 e2 f2 a3 b3 c3 d3 *g3 h3* a4 b4 c4 d4 e4 f4 a5 b5 c5 d5 e5 f5 a6 b6 c6 d6 g6 h6 T : schema : a,b,c,d,x,y a1 b1 c1 d1 g1 h1 a3 b3 c3 d3 g3 h3 a6 b6 c6 d6 g6 h6 U: schema : a,b,c,d,x,y a1 b1 c1 d1 e1 f1 a2 b2 c2 d2 e2 f2 a3 b3 c3 d3 e3 f3 a4 b4 c4 d4 e4 f4 a5 b5 c5 d5 e5 f5 Many thanks, -Dan
