" LEFT JOIN ( SELECT max( Id ) Id, MaterialCode, MaterialDesc, EstimateType, EstimateTypeDesc FROM Set_material GROUP BY MaterialCode, MaterialDesc, EstimateTypeDesc, EstimateType ) temp2 ON temp.MaterialCode = temp2.MaterialCode \n"+
" LEFT JOIN ( SELECT max( Id ) Id, MaterialCode, MaterialDesc, EstimateType, EstimateTypeDesc FROM Set_material GROUP BY MaterialCode, MaterialDesc, EstimateTypeDesc, EstimateType ) temp2 ON temp.MaterialCode = temp2.MaterialCode \n"+
" LEFT JOIN ( SELECT MAX ( Id ) Id, MaterialCode, MaterialDesc, EstimateType, EstimateTypeDesc FROM Set_material GROUP BY MaterialCode, MaterialDesc, EstimateTypeDesc, EstimateType ) temp2 ON temp1.MaterialCode = temp2.MaterialCode";
" LEFT JOIN ( SELECT MAX ( Id ) Id, MaterialCode, MaterialDesc, EstimateType, EstimateTypeDesc FROM Set_material GROUP BY MaterialCode, MaterialDesc, EstimateTypeDesc, EstimateType ) temp2 ON temp1.MaterialCode = temp2.MaterialCode";