Question

Any idea how to convert this to linq?

SELECT DISTINCT PartNumber AS [PartNumber That Includes EVERY ItemNumber Listed in @RequiredItemsTable]
  FROM Part.BillsOfMaterialsFlattened AS bom1 
  WHERE NOT EXISTS
       (SELECT *
          FROM @RequiredItemsTable w
         WHERE NOT EXISTS
               (SELECT *
                  FROM Part.BillsOfMaterialsFlattened AS bom2
                 WHERE (bom1.PartNumber = bom2.PartNumber)
                   AND (bom2.ItemNumber = w.ItemNumber)));

I’ve seen several examples on this site, tried to emulate them….but so far not getting there.

thanks!

Here’s a tabular example of what I’m seeking to achieve via linq. The foregoing T-SQL does the trick.

Part.BillsOfMaterialsFlattened
PartNumber  ItemNumber
10041047    10034480
10041047    10041090
10041047    10041091
10041048    10034480
10041048    10041091
10041049    10034650
10041049    10041090
10041049    10041091
10041050    10034650
10041050    10041091
10041061    10001331
10041061    10001422

@RequiredItemsTable
ItemNumber
10041090
10041091

Want LINQ statement to generate IQueryable<String>

PartNumber (Part Numbers that include all Required Item Numbers)
10041047
10041049

Answer 1

The following linq does the trick:

var requiredItems = criteria.BomItemsIncluded.AsQueryable();
var partNumbers = (from b in _db.BillsOfMaterialsFlatteneds
                    group b by b.PartNumber into g
                    where requiredItems.All(r => g.Select(_ => _.ItemNumber).Contains(r))
                    select g.Key).Distinct();