Sql-server – Getting Dates In Range Into Table

I am going to assume that there isn't an index on the date columns, otherwise I think that the query would have been structured differently. If there is, you can probably find a better performing one than this.

The advantage of this query is that it can get all the data in one scan. The disadvantage is that it has to sort the data and join EventEmployee on the entire table. So as always, test with your own situation. This query also assumes that the MAX date is either unique or that equivalent rows would be acceptable.

USE AdventureWorks2012
GO
;
WITH Base AS (
   SELECT 
      TransactionHistory.*
      ,ProductVendor.BusinessEntityID
      ,MAX(CASE WHEN TransactionDate < '2008-08-01' THEN TransactionDate END) 
           OVER (PARTITION BY ProductVendor.BusinessEntityID) AS PreviousVendorTransaction
      ,COUNT(CASE WHEN TransactionDate >= '2008-08-01' THEN 1 END ) 
           OVER (PARTITION BY ProductVendor.BusinessEntityID) AS VendorAfterCutoff
   FROM
      Production.TransactionHistory
      -- Doesn't make the most sense, but I need a repeating relation
      INNER JOIN Purchasing.ProductVendor
         ON TransactionHistory.ProductID = ProductVendor.ProductID
),
Filtered AS (
   SELECT
      *
   FROM
      Base
   WHERE
      Base.TransactionDate >= '2008-08-01'
      OR (TransactionDate = PreviousVendorTransaction AND VendorAfterCutoff > 0)
)
SELECT DISTINCT
   TransactionID
   ,ProductID
   ,ReferenceOrderID
   ,ReferenceOrderLineID
   ,TransactionDate
   ,TransactionType
   ,Quantity
   ,ActualCost
   ,ModifiedDate
FROM
   Filtered

Edit:

Hmm, I think I may have to take back my comment on structuring it differently if there are indexes. The other suggestions that I have are probably fairly minor.

• Make sure the query is using the indexes you're expecting it to. Start and End date to build temp table, end date to drive the previous event loop.
• If the query to build the temp table is doing a lookup on the clustered index, it may be better to hold off and do that as part of the main query.
• Try using a cte instead of a temp table. I think that a cte might be more competitive with the way that the query is structured below.
• If you are returning a lot of events, it might be better to pull out the event table lookup to the main query to give the optimizer the option of doing a merge join.
• I don't see a way of optimizing the previous event lookup short of an indexed view.

Here's a query that combines a few of those ideas.

SELECT
    e.[EventID]
INTO #EventTemp
FROM
    [Events] AS e
WHERE
    ( e.[EventStart] >= @StartDate AND e.[EventStart] <= @EndDate )
    OR ( e.[EventEnd] >= @StartDate AND e.[EventEnd] <= @EndDate )

;
WITH PrevEvent AS (
    SELECT
        EmpPrevEvent.[EventID]
    FROM
    (
        SELECT DISTINCT
            ee.[EmployeeID]
        FROM
            #EventTemp
            INNER JOIN [EventEmployee] AS ee ON
                #EventTemp.[EventID] = ee.[EventID]
    ) AS Emp
    CROSS APPLY (
        SELECT TOP 1
            e.[EventID]
        FROM
            [Events] AS e
            INNER JOIN [EventEmployee] AS ee ON
                e.[EventID] = ee.[EventID]
        WHERE
            ee.[EmployeeID] = Emp.[EmployeeID]
            AND e.[EventEnd] < @StartDate
        ORDER BY 
            e.[EventEnd] DESC
    ) AS EmpPrevEvent
)
SELECT
    e.[EventID],
    e.[EventStart],
    e.[EventEnd],
    e.[EventTypeID]
FROM
    [Events] AS e
WHERE
    e.EventID IN (
        SELECT EventID
        FROM #EventTemp
        UNION
        SELECT EventID
        FROM PrevEvent
    )

Your problem may be that the backup set was created but the backup did not complete. I use the query below to check my backups

USE MSDB;
GO

SELECT TOP  300
            bckset.database_name AS DatabaseName,
            bckmdiaset.physical_device_name AS BackupLocation,
            CASE 
                WHEN bckset.backup_size <= '10485760' THEN
                    CAST(CAST(bckset.backup_size/1024 AS INT) AS VARCHAR(14)) + ' ' + 'KB'
                ELSE
                    CASE 
                        WHEN bckset.backup_size <= '1048576000' THEN
                            CAST(CAST(bckset.backup_size/1024/1024 AS INT) AS VARCHAR(14)) + ' ' + 'MB'
                        ELSE
                            CAST(CAST(bckset.backup_size/1024/1024/1024 AS INT) AS VARCHAR(14)) + ' ' + 'GB'
                    END
            END backupSize,
            CAST (bckset.backup_start_date AS smalldatetime) AS StartTime,
            CAST (bckset.backup_finish_date AS smalldatetime)FinishTime,
            CASE 
                WHEN CAST(DATEDIFF(second, bckset.backup_start_date, bckset.backup_finish_date )AS VARCHAR (4)) <= 60 THEN
                    CAST(DATEDIFF(second, bckset.backup_start_date,bckset.backup_finish_date) AS VARCHAR(4))+ ' ' + 'Seconds'
                ELSE
                    CAST(DATEDIFF(minute, bckset.backup_start_date,bckset.backup_finish_date) AS VARCHAR(4))+ ' ' + 'Minutes'
            END AS TimeTaken,
            CAST(bckset.first_lsn AS VARCHAR(25)) AS FirstLogSequenceNumber,
            CAST(bckset.last_lsn AS VARCHAR(25)) AS LastLogSequenceNumber,
            CASE bckset.[type]
                WHEN 'D' THEN 'Full'
                WHEN 'I' THEN 'Differential database'
                WHEN 'L' THEN 'Transaction Log'
                WHEN 'F' THEN 'File or filegroup'
                WHEN 'G' THEN 'Differential file'
                WHEN 'P' THEN 'Partial'
                WHEN 'Q' THEN 'Differential partial'
            END AS BackupType,
            bckset.server_name As ServerName,
            bckset.recovery_model As RecoveryModel,
            CASE bckset.is_snapshot
                WHEN '0' THEN 'FALSE'
                WHEN '1' THEN 'TRUE'
            END AS IsSnapshot,
            CASE [compatibility_level]
                WHEN 60 THEN 'SQL Server 6.0'
                WHEN 65 THEN 'SQL Server 6.5'
                WHEN 70 THEN 'SQL Server 7.0'
                WHEN 80 THEN 'SQL Server 2000'
                WHEN 90 THEN 'SQL Server 2005'
                WHEN 100 THEN 'SQL Server 2008'
                WHEN 110 THEN 'SQL Server 2012'
                WHEN 120 THEN 'SQL Server 2014'
            END AS CompatibilityLevel

FROM        msdb.dbo.backupset bckset
INNER JOIN  msdb.dbo.backupmediafamily bckmdiaset ON bckset.media_set_id = bckmdiaset.media_set_id

---WHERE bckset.database_name = ''

ORDER BY    backup_start_date DESC, backup_finish_date