[英]NOT IN sub select from T SQL to LINQ?
嘗試在此處編寫LINQ查詢以從T SQL復制NOT IN。 這是我要在LINQ中使用的SQL查詢:
select * from schema.Table1
where TableId NOT IN (select pa.TableId from schema.Table2 ta
where ta.SecondaryId = myParameter)
看過以前的帖子,但還沒有完全起作用。
var query = from a in _Context.Table1
where a.TableId != _Context.Table2.Any(ta=>(ta.SecondaryId== myParameter))
select a;
您可以嘗試這樣的事情:
// get all the values that you want to exclude in a list.
var excluded = (from t in _Context.TableId
select t.TableId
where t.SecondaryId == myParameter).ToList();
// get all the items from Table1 that aren't contained in the above list
var query = from t in _Context.Table1
where excluded.Contains(t.TableId)==false
select t;
要么
// get all the values that you want to exclude in a list.
var excluded = _Context.TableId
.Where(x=>x.SecondaryId == myParameter)
.Select(x=>x.TableId)
.ToList();
// get all the items from Table1 that aren't contained in the above list
var query = _Context.Table1.Where(a=>!excluded.Any(a.TableId));
var query = from a in _Context.Table1
where _Context.Table2.Any(ta=>ta.SecondaryId== a.TableId) == false
select a;
您可能能夠做到這一點……雖然不漂亮……但鑒於LinqToSQL的有限功能集,它也許可以正常工作
IQueryable<Table2> excluded = from t in _Context.Table2
where t.SecondaryId == myParameter
select t;
// get all the items from Table1 that aren't contained in the above list
IQueryable<Table1> query = from t1 in _Context.Table1
join t2 in excluded on t1.TableId equals t2.TableId into foo
from e in foo.DefaultIfEmpty()
where e == null
select t;
該查詢的結果應為
SELECT t1.*
FROM Table1 t1
LEFT JOIN (SELECT * FROM Table2 WHERE SecondaryId == @myParameter) t2
ON t1.TableId = t2.TableId
WHERE t2.TableId IS NULL
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