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    <p>You could select each calculation as a subquery (or more readably as a common table expression), and then base the next calculation on the subquery or previous CTE.</p> <p>The other option, which might be easier is just do all your calculations as multiple update statements, one after the other.</p> <p>Here's an example of the CTEs in turn...</p> <pre><code>;WITH c1 AS ( SELECT [Part Num], Daily, [O.F], [Order], MCT, Transit, [Safety], [Container Size], [No. of Kanban Card], [Run Line], [Lot Size], [Max. Inventory], [Trigger 1], [Trigger 2], [Trigger 3], [Avg. Inventory] FROM SuperMarketTest ), c2 AS ( SELECT [Part Num], Daily, [O.F], (Daily * [O.F]) AS [Order], MCT, Transit, [Safety], [Container Size], (Daily * ([O.F] + MCT + Transit + [Safety]) / [Container Size]) AS [No. of Kanban Card], [Run Line], [Lot Size], [Max. Inventory], [Trigger 1], [Trigger 2], [Trigger 3], [Avg. Inventory] FROM c1 ) , c3 AS ( SELECT [Part Num], Daily, [O.F], [Order], MCT, Transit, [Safety], [Container Size], [No. of Kanban Card], ([O.F] * Daily / [Container Size]) AS [Run Line], [Lot Size], ([No. of Kanban Card] * [Container Size]) AS [Max. Inventory] [Trigger 1], [Trigger 2], [Trigger 3], [Avg. Inventory] FROM c2 ) SELECT [Part Num], Daily, [O.F], [Order], MCT, Transit, [Safety], [Container Size], [No. of Kanban Card], [Run Line], [Lot Size], [Max. Inventory] (([No. of Kanban Card] - [Run Line]) * [Container Size]) AS [Trigger 1], (([No. of Kanban Card] - [Run Line] - 1) * [Container Size]) AS [Trigger 2], (([No. of Kanban Card] - [Run Line] - 2) * [Container Size]) AS [Trigger 3], (Daily * (0.5 * ([O.F] + MCT) + Transit + [Safety])) AS [Avg. Inventory] FROM c3 </code></pre>
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