-- Step 1: Insert into a temporary table with an additional column for batch processing, update 50 k at a time
SELECT [Id] AS [OrganizationUserId], [OrganizationId], CAST(ROW_NUMBER() OVER(ORDER BY [Id]) / 50000 AS INT) AS Batch
INTO #TempOrgUser
FROM [dbo].[OrganizationUser]
WHERE [AccessAll] = 1;

-- Step 2: Get the maximum batch number
DECLARE @MaxBatch INT = (SELECT MAX(Batch) FROM #TempOrgUser);
DECLARE @CurrentBatch INT = 0;

-- Step 3: Process each batch
WHILE @CurrentBatch <= @MaxBatch
BEGIN
    -- Update existing rows in [dbo].[CollectionUser]
    UPDATE target
    SET
        target.[ReadOnly] = 0,
        target.[HidePasswords] = 0,
        target.[Manage] = 1
        FROM [dbo].[CollectionUser] AS target
        JOIN (
            SELECT C.[Id] AS [CollectionId], T.[OrganizationUserId]
            FROM [dbo].[Collection] C
            JOIN #TempOrgUser T ON C.[OrganizationId] = T.[OrganizationId] AND T.Batch = @CurrentBatch
        ) AS source
    ON target.[CollectionId] = source.[CollectionId] AND target.[OrganizationUserId] = source.[OrganizationUserId];

    -- Insert new rows into [dbo].[CollectionUser]
    INSERT INTO [dbo].[CollectionUser] ([CollectionId], [OrganizationUserId], [ReadOnly], [HidePasswords], [Manage])
    SELECT source.[CollectionId], source.[OrganizationUserId], 0, 0, 1
    FROM (
             SELECT C.[Id] AS [CollectionId], T.[OrganizationUserId]
             FROM [dbo].[Collection] C
                 JOIN #TempOrgUser T ON C.[OrganizationId] = T.[OrganizationId] AND T.Batch = @CurrentBatch
         ) AS source
             LEFT JOIN [dbo].[CollectionUser] AS target
    ON target.[CollectionId] = source.[CollectionId] AND target.[OrganizationUserId] = source.[OrganizationUserId]
    WHERE target.[CollectionId] IS NULL;

    -- Move to the next batch
    SET @CurrentBatch = @CurrentBatch + 1;
END;

-- Step 4: Drop the temporary table
DROP TABLE #TempOrgUser;