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CREATE TABLE tnHeaders (`fnIDX` INTEGER, `fnDESCRIPTION` VARCHAR(2)); INSERT INTO tnHeaders (`fnIDX`, `fnDESCRIPTION`) VALUES ('1', 'h1'), ('2', 'h2'), ('3', 'h3'); CREATE TABLE tnData (`fnIDX` INTEGER, `fnHEADER_IDX` INTEGER, `fnDESCRIPTION` VARCHAR(2)); INSERT INTO tnData (`fnIDX`, `fnHEADER_IDX`, `fnDESCRIPTION`) VALUES ('1', '1', 'd1'), ('2', '1', 'd2'), ('3', '1', 'd3'), ('4', '2', 'd4'), ('5', '2', 'd5'), ('6', '2', 'd6'), ('7', '3', 'd7'), ('8', '3', 'd8'), ('9', '3', 'd9');
SELECT fnOUTPUT FROM ( SELECT fnDESCRIPTION fnOUTPUT, fnIDX header_index, 1 is_header FROM tnHeaders UNION ALL SELECT fnDESCRIPTION, fnHEADER_IDX, 0 FROM tnData ) t ORDER BY header_index, is_header DESC, fnOUTPUT;
fnOUTPUT
h1
d1
d2
d3
h2
d4
d5
d6
h3
d7
d8
d9