9.13 var concat = function(x, y) { return x + y; }; map2(concat, ['a', 'b'], ['1', '2']); // => ['a1', 'b2'] mapN(fn, n) Returns an array obtained by mapping the function fn over the integers [0,1,

foo’) AS t(a int, b text, c text[]); a | b | c ----+---+--------------- 0 | a | {a0,b0,c0} 1 | b | {a1,b1,c1} 2 | c | {a2,b2,c2} 2174 dblink_connect 3 | d | {a3,b3,c3} 4 | e | {a4,b4,c4} 5 | f | {a5 AS t1(f1 int, f2 text, f3 text[]); f1 | f2 | f3 ----+----+------------ 0 | a | {a0,b0,c0} 1 | b | {a1,b1,c1} 2 | c | {a2,b2,c2} (3 rows) contrib_regression=# SELECT * FROM dblink_get_result(’dtest1’) AS t1(f1 int, f2 text, f3 text[]); f1 | f2 | f3 ----+----+------------ 0 | a | {a0,b0,c0} 1 | b | {a1,b1,c1} 2 | c | {a2,b2,c2} (3 rows) contrib_regression=# SELECT * FROM dblink_get_result(’dtest1’)

int, b text, c text[]); a | b | c ----+---+--------------- 0 | a | {a0,b0,c0} 1 | b | {a1,b1,c1} 2 | c | {a2,b2,c2} 3 | d | {a3,b3,c3} 4 | e | {a4,b4,c4} 5 | f | {a5,b5,c5} 6 | g int, f2 text, f3 text[]); f1 | f2 | f3 ----+----+------------ 0 | a | {a0,b0,c0} 1 | b | {a1,b1,c1} 2 | c | {a2,b2,c2} (3 rows) contrib_regression=# SELECT * FROM dblink_get_result('dtest1') int, f2 text, f3 text[]); f1 | f2 | f3 ----+----+------------ 0 | a | {a0,b0,c0} 1 | b | {a1,b1,c1} 2 | c | {a2,b2,c2} (3 rows) contrib_regression=# SELECT * FROM dblink_get_result('dtest1')