Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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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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