SQL SELECT * FROM OPENROWSET with Variable

Question

I am trying to pass a variable into a SELECT statement in OPENROWSET but I keep getting an error

DECLARE @dDateTIME DATE

SET @dDateTIME = (SELECT SalesDate FROM dbo.SalesDate)

INSERT INTO dbo.tblSales
SELECT * FROM OPENROWSET('MSDASQL', 'dsn=mydsn;uid=myid;pwd=mypwd;',
    'SELECT 
        ID,
        TranDate,
        ProductID,
        CostValue,
        SalesValue,
        QtySold,
    FROM tblSales WHERE TranDate='' + @dDateTIME + ''')

DECLARE @dDateTIME DATE
SET @dDateTIME = (SELECT SalesDate FROM dbo.SalesDate)

DECLARE @SQL NVARCHAR(1024) = 
 'SELECT 
        ID,
        TranDate,
        ProductID,
        CostValue,
        SalesValue,
        QtySold,
    FROM tblSales WHERE TranDate=''' + CAST(@dDateTIME AS VARCHAR(64)) + ''''

DECLARE @RunSQL NVARCHAR(max) 
SET @RunSQL=
    'SELECT * FROM OPENROWSET (''MSDASQL'', ''dsn=mydsn;uid=myid;pwd=mypwd;'',''EXEC @SQL'')'`

What syntax do I use to apply to @SQL?

The error I get is:

The error is :OLE DB provider "MSDASQL" for linked server "(null)" returned message "[Pervasive][ODBC Client Interface][LNA][Pervasive][ODBC Engine Interface]Error in predicate: TranDate = '(SELECT @dDateTIME)' "

Answer 1

Your variable is not being concatenated to the string (its ''' to close a string with a ') to correct this (and perform the necessary type conversion):

DECLARE @SQL NVARCHAR(1024) = 
 'SELECT 
        ID,
        TranDate,
        ProductID,
        CostValue,
        SalesValue,
        QtySold,
    FROM tblSales WHERE TranDate=''' + CAST(@dDateTIME AS VARCHAR(64)) + ''''

Additionally you cannot use an expression or variable with OPENROWSET so you are going to need to call it via EXEC()/sp_executeSQL, see; Using a Variable in OPENROWSET Query