Nested Select in LLBLGen
So, I have the following tables:
Using LLBLGen 2.6 (Adapter Version - No Linq), SQL Server, and .NET 3.5, how would I write the following query?
SELECT o.ObjectID
FROM Object o
INNER JOIN ObjectDetail d ON i.ObjectID = d.ObjectID
WHERE d.CreatedDate = ( SELECT MAX(CreatedDate)
FROM ObjectDetail
WHERE ObjectID = o.ObjectID
)
There will be more filtering, however it's not relevant to this, like if I had 开发者_JAVA百科an ObjectDetailType and I wanted the max ObjectDetail row for a certain type.
Also, it doesn't have to select o.ObjectID, any / all columns will be fine.
Solved it
PredicateExpression.AddWithAnd(
new FieldCompareSetPredicate(
ObjectDetailFields.CreatedDate,
null,
ObjectDetailFields.CreatedDate.SetAggregateFunction(AggregateFunction.Max),
null,
SetOperator.Equal,
(ObjectFields.ObjectID == ObjectDetailsFields.ObjectID)
)
);
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