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CREATE TABLE [Case] ([CaseNumber] INT, [ID] INT, [Guid] INT); INSERT INTO [Case] ([ID]) VALUES (1), (2), (3); CREATE TABLE [Instance] ([ID] INT, [CaseID] INT, [Level] INT, [Desc] NVARCHAR(64)); INSERT INTO [Instance] ([CaseID], [Level]) VALUES (1, 1), (2, 1), (2, 2), (3, 1), (3, 1); SELECT [Case].[ID] FROM [Case] JOIN [Instance] ON [Instance].[CaseID] = [Case].[ID] GROUP BY [Case].[ID] HAVING MAX([Level]) = 1;
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