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Developer-C 11.1
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CREATE TABLE tab(NR NVARCHAR2(100), GRD NVARCHAR2(100), DT DATE);
INSERT INTO tab SELECT '00000000000000000001' AS NR, N'06' AS GRD, DATE '2013-01-01' AS DT FROM dual UNION ALL SELECT '00000000000000000001' ,N'06', DATE '2013-01-01' FROM dual UNION ALL SELECT '00000000000000000001' ,N'21', DATE '2013-01-01' FROM dual UNION ALL SELECT '00000000000000000002' ,N'06', DATE '2013-01-01' FROM dual UNION ALL SELECT '00000000000000000002' ,N'21', DATE '2013-01-01' FROM dual UNION ALL SELECT '00000000000000000004' ,N'01', DATE '2013-03-31' FROM dual;
6 rows affected
CREATE TYPE tbl_array AS TABLE OF NVARCHAR2(4000);
select nr , CAST(collect(grd) AS tbl_array) grds from tab group by nr
with prep as ( select nr , CAST(collect(grd) AS tbl_array) grds, ROW_NUMBER() OVER(ORDER BY nr) AS rn from tab group by nr ) select p.NR, p.grds, p2.grds as lead_grds from prep p LEFT JOIN prep p2 ON p2.rn = p.rn +1;