If you need to denormalize or flatten PeopleSoft summer trees (trees with leaves) in your data warehouse, here is an ETL process for you to follow. Typical PeopleSoft summer tree structure SQL to flatten the PeopleSoft summer tree Substitute TREE_NAME with the name(s) of your summer tree(s) on line 54 below. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 SELECT SQ4.SETID, SQ4.TREE_NAME, SQ4.EFFDT, SQ4.RANGE_FROM, SQ4.RANGE_TO, SQ4.LEVEL1, SQ4.LEVEL2, SQ4.LEVEL3, DECODE(SQ4.LVL4,'',SQ4.LEVEL3,SQ4.LVL4) AS LEVEL4 FROM (SELECT SQ3.SETID, SQ3.TREE_NAME, SQ3.EFFDT, SQ3.RANGE_FROM, SQ3.RANGE_TO, SQ3.LEVEL1, SQ3.LEVEL2, DECODE(SQ3.LVL3,'',SQ3.LEVEL2,SQ3.LVL3) AS LEVEL3, SQ3.LVL4 FROM (SELECT SQ2.SETID, SQ2.TREE_NAME, SQ2.EFFDT, SQ2.RANGE_FROM, SQ2.RANGE_TO, SQ2.LEVEL1, DECODE(SQ2.LVL2,'',SQ2.LEVEL1,SQ2.LVL2) AS LEVEL2, SQ2.LVL3, SQ2.LVL4 FROM (SELECT SQ1.SETID, SQ1.TREE_NAME, SQ1.EFFDT, SQ1.RANGE_FROM, SQ1.RANGE_TO, MAX(SQ1.L1) AS LEVEL1, MAX(SQ1.L2) AS LVL2, MAX(SQ1.L3) AS LVL3, MAX(SQ1.L4) AS LVL4 FROM (SELECT A.SETID, A.TREE_NAME, A.EFFDT, C.RANGE_FROM, C.RANGE_TO, DECODE(A.TREE_LEVEL_NUM,1, D.DESCR,'') AS L1, DECODE(A.TREE_LEVEL_NUM,2, D.DESCR,'') AS L2, DECODE(A.TREE_LEVEL_NUM,3, D.DESCR,'') AS L3, DECODE(A.TREE_LEVEL_NUM,4, D.DESCR,'') AS L4 FROM PSTREENODE A, PSTREENODE B, PSTREELEAF C, PS_TREE_NODE_TBL D WHERE A.TREE_NAME IN ('TREE_NAME') AND A.SETID = B.SETID AND A.TREE_NAME = B.TREE_NAME AND B.EFFDT = A.EFFDT AND B.TREE_NODE_NUM BETWEEN A.TREE_NODE_NUM AND A.TREE_NODE_NUM_END AND B.SETID = C.SETID AND B.TREE_NAME = C.TREE_NAME AND B.TREE_NODE_NUM = C.TREE_NODE_NUM AND C.EFFDT = A.EFFDT AND A.SETID = D.SETID AND A.TREE_NODE = D.TREE_NODE AND D.EFFDT = (SELECT MAX(D_ED.EFFDT) FROM PS_TREE_NODE_TBL D_ED WHERE D.SETID = D_ED.SETID AND D.TREE_NODE = D_ED.TREE_NODE AND D_ED.EFFDT <= SYSDATE)) SQ1 GRO