动态表名称随获取日期更改的SQL变量

Question

I have the following sql which I can't get working, there is a table which gets created daily with the format of YYYYMMDD at the end of the table name each day. Here is the SQL:

    DECLARE @var INT



    SET @var = CAST(CONVERT(NVARCHAR(8),GETDATE()-1,112) AS int)

    SELECT @VAR


    SELECT
    CASE WHEN LEN("AssociatedData") = 0 OR "AssociatedData" IS NULL THEN '*Unknown*' ELSE AssociatedData END AS AssociatedData,
    "CallEvent",
    CASE WHEN LEN("CallEventName") = 0 OR "CallEventName" IS NULL THEN '*Unknown*' ELSE CallEventName END AS CallEventName,
    "CallID",
    CASE WHEN LEN("Destination") = 0 OR "Destination" IS NULL THEN '*Unknown*' ELSE Destination END AS Destination,
    CASE WHEN LEN("EventData") = 0 OR "EventData" IS NULL THEN '*Unknown*' ELSE EventData END AS EventData,
    "FirstEventTimestamp",
    "SequenceNumber",
    "Source",
    CASE WHEN LEN("TelsetLoginID") = 0 OR "TelsetLoginID" IS NULL THEN '*Unknown*' ELSE TelsetLoginID END AS TelsetLoginID,
    "Time",
    "Timestamp"
    FROM concat(eCallByCallStat,@var)

I need to get this working as a SQL query rather than a StoredProcedure.

Is this possible at all to append the datekey straight after the tablename.

Thank you

Answer 1

DECLARE @tsql VARCHAR(MAX)
DECLARE @var DATE = GETDATE() - 1

SET @tsql = '
SELECT
  [AssociatedData] = CASE WHEN LEN( [AssociatedData] ) > 0 THEN [AssociatedData] ELSE ''*Unknown*'' END,
  [CallEvent],
  [CallEventName] = CASE WHEN LEN( [CallEventName] ) > 0 THEN [CallEventName] ELSE ''*Unknown*'' END,
  [CallID],
  [Destination] = CASE WHEN LEN( [Destination] ) > 0 THEN [Destination] ELSE ''*Unknown*'' END,
  [EventData] = CASE WHEN LEN( [EventData] ) > 0 THEN [EventData] ELSE ''*Unknown*'' END,
  [FirstEventTimestamp],
  [SequenceNumber],
  [Source],
  [TelsetLoginID] = CASE WHEN LEN( [TelsetLoginID] ) > 0 THEN [TelsetLoginID] ELSE ''*Unknown*'' END,
  [Time],
  [Timestamp]
FROM 
  ' + CONCAT( 'eCallByCallStat', CONVERT( VARCHAR, @var, 112 ) )

PRINT @tsql
EXEC sp_executesql @tsql