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CREATE TABLE tbl ( tbl_id serial PRIMARY KEY -- required to define order! , x int , y int ); INSERT INTO tbl(x, y) VALUES (0, 1), (1, 1), (2, 1), (5, 2), (5, 2), (2, 2), (4, 3), (6, 3), (2, 3);
9 rows affected
WITH cte AS ( SELECT *, row_number() OVER (PARTITION BY y ORDER BY tbl_id) AS rn FROM tbl ORDER BY y, tbl_id ) SELECT text 'y' AS col, array_agg (y) AS values FROM cte WHERE rn = 1 UNION ALL ( -- parentheses neeeded SELECT text 'x' || rn, array_agg (x) FROM cte GROUP BY rn ORDER BY rn );
col
values
y
{1,2,3}
x1
{0,5,4}
x2
{1,5,6}
x3
{2,2,2}