SELECT [Problem_Name] ,[Lab_Name], COUNT(*) count_problem FROM [laboratory].[dbo].[Problem_tab]p, [laboratory].[dbo].[PC_Hard_Problem_tab] pp,[laboratory].[dbo].[Lab_tab] l WHERE p.Problem_Id = pp.Problem_Id AND l.Lab_Id = 8 GROUP BY p.Problem_Id,Problem_Name,[Lab_Name];
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