I need some help in figuring out how to join tables to my query. The table names change every day as the date is used in the table name and older tables are dropped as they are no longer needed.
My query looks for "scans" that have data in the database and are in the process of being processed (for a lack of a better word).
My current query is:
USE RetinaCSDatabase SELECT S.ScanID [Scan ID], S.PolicyName [Scan], DATEADD(hh, +2, S.StartTime) [Scan Start], A.AssetName [Scanner], COUNT(AIPS.AssetIPID) [Hosts], S.TransactionGroup [Transaction Group ID] FROM Scan S (NOLOCK) LEFT JOIN Scanner SC (NOLOCK) ON S.ScannerID = SC.ScannerID LEFT JOIN Asset A (NOLOCK) ON SC.AssetID = A.AssetID LEFT JOIN Asset_IP_Scan AIPS (NOLOCK) ON S.ScanID = AIPS.ScanID WHERE S.ProcessStatus < 2 GROUP BY S.ScanID, S.PolicyName, S.StartTime, A.AssetName, S.TransactionGroup ORDER BY S.StartTime ASC, S.PolicyName ASC, A.AssetName ASC
What I need to join is the table(s) with the data still requiring processing. Those tables start with the name "evt_scan_" and then the date. So, a full table name would be "evt_scan_20171222" for example. The data for a scan performed on the 22nd of December 2017 will have data in the table "evt_scan_20171222" and possibly in the following days table, "evt_scan_20171223". So, I need my query first to check if the table exists and then join it to do a count and also to check if the following days table exists, join it to do another count and add up the 2 counts to show the outstanding records requiring processing.
If the table names were static I would join them with this query:
LEFT JOIN evt_scan_20171222 evt1 ON S.TransactionGroup = evt1.evtTransactionGroup
It would also require a WHERE statement returning only records where evtStatus = 0.