SQLCODE: -420, SQLSTATE: 22018, SQLERRMC: BIGINT

[Running DB2 UDB version 9] Why does this SQL statement work

SELECT 
       CASE
       WHEN A.DAILYDOWNLOADSIZE is null THEN 0
    else bigint(A.DAILYDOWNLOADSIZE)
       END "DAILYDOWNLOADSIZE",
       CASE
       WHEN A.DAILYDOWNLOADTIME is null THEN 0
    else bigint(A.DAILYDOWNLOADTIME)
       END "DAILYDOWNLOADTIME"
FROM 
EDMPROD.MQT_STB_FACTS A 

...when this one does not

SELECT DISTINCT 
bigint(A.CAMID) AS "CAMID",
bigint(A.RID) AS "RID",
A.SOFTWAREVERSION,
A.MODELNUMBER,
A.MANUFACTURERID,
A.MODDATE,
A.POSTTIME,
A.DELIVERYMETHOD,开发者_StackOverflow中文版
bigint(A.UPTIME )  AS "UPTIME",
bigint(A.NUMBEROFRESETSSINCELASTSWDL )  AS "NUMBEROFRESETSSINCELASTSWDL",
bigint(A.NUMBEROFSEARCHSIGNALOSDTUNER1 ) AS "NUMBEROFSEARCHSIGNALOSDTUNER1",
bigint(A.NUMBEROFSEARCHSIGNALOSDTUNER2 ) AS "NUMBEROFSEARCHSIGNALOSDTUNER2",
bigint(A.NUMBEROFUSERDISKREFORMATS ) AS "NUMBEROFUSERDISKREFORMATS",
bigint(A.NUMBEROFSYSTEMDISKREFORMATS ) AS "NUMBEROFSYSTEMDISKREFORMATS",
bigint(A.NUMBEROFRECOVEREDDISKERRORS ) AS "NUMBEROFRECOVEREDDISKERRORS",
IPINFO,
       CASE
       WHEN A.DAILYDOWNLOADSIZE is null THEN 0
    else bigint(A.DAILYDOWNLOADSIZE)
       END "DAILYDOWNLOADSIZE",
       CASE
       WHEN A.DAILYDOWNLOADTIME is null THEN 0
    else bigint(A.DAILYDOWNLOADTIME)
       END "DAILYDOWNLOADTIME",
bigint(A.TOTALNUMBEROFDOWNLOADSSTARTED ) AS "TOTALNUMBEROFDOWNLOADSSTARTED",
bigint(A.TOTALNUMOFCOMPLETEDDLS ) AS "TOTALNUMOFCOMPLETEDDLS",
CURRENT_DATE AS "LOAD_DATE"
FROM 
EDMPROD.MQT_STB_FACTS A 

I get an error SQL0420N Invalid character found in a character string argument of the function "BIGINT". SQLSTATE=22018.

By troubleshooting the query, I confirm the culprits are the two columns DAILYDOWNLOADSIZE and DAILYDOWNLOADTIME. Both must be casted from character(15) to bigint.

What is the second SQL statement not working???

---

I was losing my mind over this so I made a simple change in my staging table (EDMPROD.MQT_STB_FACTS).

Instead of typing the columns as characters and then casting them as bigint, I dropped and recreated my table with the datatypes set to BIGINT(8).

I removed the castings from my SQL statement and the error went away.

Go figure..........