USE [DepartmentDatabasePortal]
GO

DELETE FROM [dbo].[OrderSyncHistories]
GO

DELETE FROM [dbo].[Orders]
GO

DELETE FROM [dbo].[Students]
GO

DELETE FROM [dbo].[StudentGroups]
GO

DECLARE @RoleId uniqueidentifier

SELECT @RoleId = [Id]
FROM [dbo].[Roles]
WHERE [RoleName] = 'Студент'


DELETE u FROM [dbo].[Users] u
JOIN [dbo].[UserRoles] ur ON u.[Id] = ur.[UserId]
      WHERE ur.[RoleId] = @RoleId


DELETE FROM [dbo].[UserRoles]
      WHERE [RoleId] = @RoleId
GO