## T-SQL Calculation

 Author Message PSB SSC Eights! Group: General Forum Members Points: 985 Visits: 1544 Hi,I have a table where I need to calculate Trend based on Week Type and Unit .CREATE TABLE #REport(TYPE VARCHAR(20),Unit VARCHAR(20),Forecast INT,Week INT,Trend NUMERIC(9,2))INSERT INTO #REport( TYPE, Unit, Forecast, Week, Trend )SELECT 'Net Revenue','XXX',0,1,0UNIONSELECT 'Net Revenue','XXX',0,2,0UNIONSELECT 'Net Revenue','XXX',0,3,0UNIONSELECT 'Net Revenue','XXX',0,4,0UNIONSELECT 'Net Revenue','XXX',105000,5,0UNIONSELECT 'Invest','XXX',0,1,0UNIONSELECT 'Invest','XXX',0,2,0UNIONSELECT 'Invest','XXX',0,3,0UNIONSELECT 'Invest','XXX',0,4,0UNIONSELECT 'Invest','XXX', 45951 ,5,0SELECT * FROM #REportDROP TABLE #REport--FOR every TYPE AND Unit, the trend should be calculated AS follows :--FOR Week 1 OF TYPE = 'Invest' and Unit = 'XXX'--Trend = 45951/MAX week number = 45951/5 = 9190.2--FOR Week 2 OF TYPE = 'Invest' and Unit = 'XXX'--Trend = 9190.2 + 45951/5 = 18380.4-- Trend of Week 1 + 45951/5--FOR Week 3 OF TYPE = 'Invest' and Unit = 'XXX'--Trend = 18380.4 + 45951/5 = 27570.6-- Trend of Week 2 + 45951/5--FOR Week 4 OF TYPE = 'Invest' and Unit = 'XXX'--Trend = 27570.6 + 45951/5 = 36760.8-- Trend of Week 3 + 45951/5--FOR Week 5 OF TYPE = 'Invest' and Unit = 'XXX'--Trend = 36760.8 + 45951/5 = 45951-- Trend of Week 4 + 45951/5Thanks,PSB J Livingston SQL SSCertifiable Group: General Forum Members Points: 5456 Visits: 35394 just to be sure.....can you please provide the actual results you require based on your sample data......and not the calcs.ta. ________________________________________________________________you can lead a user to data....but you cannot make them think and remember....every day is a school day PSB SSC Eights! Group: General Forum Members Points: 985 Visits: 1544 Desired result ..SELECT 'Invest' AS TYPE,'XXX' AS Unit,0 AS ForeCast,1 AS Week,9190.2 AS TrendUNIONSELECT 'Invest' AS Type,'XXX' AS Unit,0 AS ForeCast,2 AS Week,18380.4 AS TrendUNIONSELECT 'Invest' AS TYPE,'XXX' AS Unit,0 AS ForeCast,3 AS Week,27570.6 AS TrendUNIONSELECT 'Invest' AS Type,'XXX' AS Unit,0 AS ForeCast,4 AS Week,36760.8 AS TrendUNIONSELECT 'Invest' AS Type,'XXX' AS Unit, 45951 AS ForeCast,5 AS Week,45951 AS Trend ChrisM@Work SSCoach Group: General Forum Members Points: 16230 Visits: 19549 Otherwise you will get answers like this:`SELECT *, Trend = ([Week]/5.0) * MAX(Forecast) OVER(PARTITION BY [TYPE])FROM #REport`Which exactly meets your requirements (apart from the trivial matter of rounding) but is almost certainly incorrect. “Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail ShawFor fast, accurate and documented assistance in answering your questions, please read this article.Understanding and using APPLY, (I) and (II) Paul White Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff ModenExploring Recursive CTEs by Example Dwain Camps J Livingston SQL SSCertifiable Group: General Forum Members Points: 5456 Visits: 35394 ChrisM@Work (5/8/2014)Otherwise you will get answers like this:`SELECT *, Trend = ([Week]/5.0) * MAX(Forecast) OVER(PARTITION BY [TYPE])FROM #REport`Which exactly meets your requirements (apart from the trivial matter of rounding) but is almost certainly incorrect.Chris ...your mind reading skills are quite extraordinary :-)but have a suspicion that OP has oversimplified........we can wait and see ________________________________________________________________you can lead a user to data....but you cannot make them think and remember....every day is a school day ChrisM@Work SSCoach Group: General Forum Members Points: 16230 Visits: 19549 J Livingston SQL (5/8/2014)ChrisM@Work (5/8/2014)Otherwise you will get answers like this:`SELECT *, Trend = ([Week]/5.0) * MAX(Forecast) OVER(PARTITION BY [TYPE])FROM #REport`Which exactly meets your requirements (apart from the trivial matter of rounding) but is almost certainly incorrect.Chris ...your mind reading skills are quite extraordinary :-)but have a suspicion that OP has oversimplified........we can wait and seeJ Livingstone - you give me way too much credit for a Wild Guess :-D “Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail ShawFor fast, accurate and documented assistance in answering your questions, please read this article.Understanding and using APPLY, (I) and (II) Paul White Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff ModenExploring Recursive CTEs by Example Dwain Camps PSB SSC Eights! Group: General Forum Members Points: 985 Visits: 1544 Thanks for the solution! it works perfectly .