How to deal with Null Variables

Question

 AND (CONVERT(varchar, CAST(rtrim(SH.ship_dt) AS datetime), 101) = (CONVERT(varchar, (DATEADD(day, -1, GETDATE())), 101)))
This part of my where clause results in a NULL causing my job to fail since it is setting an integer variable.  Any tips? I've tried using ISNULL and can't seem to place it correctly.
Erika

Answer 1

Yes, the null column is ship_dt. When i used that it gave me an error message 245
Msg 245 Conversion failed when converting the varchar value '1900-01-01' to data type int.
Here is the entire portion with the suggestion above and my original commented out
DECLARE @PlasticCountItem DECIMAL(5,0)
SET @PlasticCountItem = 
CAST((
SELECT SUM(OL.qty_ordered)
FROM OEORDLIN_SQL AS OL 
INNER JOIN OEORDHDR_SQL AS OH ON OL.ord_no = OH.ord_no 
LEFT OUTER JOIN ARSHTTBL AS SH ON ltrim(OL.ord_no) = cast(SH.ord_no AS int) AND OL.item_no = SH.filler_0001 
LEFT OUTER JOIN OECUSITM_SQL AS CI ON OL.item_no = CI.item_no AND OH.cus_no = CI.cus_no 
LEFT OUTER JOIN EDCSHVFL_SQL AS XX ON SH.carrier_cd = XX.mac_ship_via 
INNER JOIN imitmidx_sql AS IM ON OL.item_no=IM.item_no 
WHERE /* INITIAL WHERE CLAUSE */ 
 OH.ord_type = 'O' 
 AND SH.void_fg IS NULL 
 AND NOT SH.hand_chg IS NULL 
 AND (OH.ord_no IN (SELECT DISTINCT cast(OH.ord_no AS int) FROM arshttbl))
 /*ONLY ORDERS SHIPPED YESTERDAY*/
 --AND (CONVERT(varchar, CAST(rtrim(SH.ship_dt) AS datetime), 101) = (CONVERT(varchar, (DATEADD(day, -1, GETDATE())), 101)))
 AND (CONVERT(varchar, CAST(rtrim(COALESCE(SH.ship_dt,'1900-01-01')) AS datetime), 101) = (CONVERT(varchar, (DATEADD(day, -1, GETDATE())), 101)))
 /*FOR ONLY 1 SHOP*/
 AND (SH.mode = '1') 
 /*EXCLUDE FAKE ITEMS AND MANUAL ENTRIES TO ARSHTTBL*/
 AND NOT IM.mat_cost_type in ('6','N') AND NOT OL.item_no in ('TREATED PALLET') AND NOT (SH.mode = '9'))
          as int)
Erika