CREATE VIEW IN DB2 - sql

Question

I have a DB2 SQL statement which selects the required rows successfully. Since its a time consuming query, I am trying to convert it into a view using the create view statement.
WITH firstequiprrn
AS (SELECT oeord# equiporder,
Min(RRN(a)) firstrow
FROM iesqafile.OPEQUIP a
GROUP BY oeord#
ORDER BY 1),
firstequiprow
AS (SELECT oeord#,
oetrlr equipmentnumber
FROM firstequiprrn
INNER JOIN iesqafile.OPEQUIP b
ON equiporder = oeord#
AND firstrow = RRN(b)),
ordermiles
AS (SELECT mmord#,
mmtotal
FROM iesqafile.mmiles
WHERE mmord# IN(SELECT orodr#
FROM iesqafile.order)
AND mmrectype = 'O'
AND mmdsp# = '00'),
stopgroup
AS (SELECT soord stoporder,
COUNT(*) stopsremain,
Min(sostp#) nextstop,
Max(soappr) apptreq,
Max(soaptm) apptmade
FROM iesqafile.stopoff
INNER JOIN iesqafile.order
ON orodr# = soord
WHERE soardt = 0
GROUP BY soord
ORDER BY 1) SELECT a.orodr# orodr_,
orcust,
orldat,
CASE orpdat
WHEN 0 THEN Varchar(0)
ELSE Varchar_format(CHAR(orpdat), 'YYYY-MM-DD')
END erdat2,
CASE orptim
WHEN 0 THEN Varchar(0)
ELSE CONCAT(CONCAT(SUBSTRING(orptim, 1, 2), ':'),
SUBSTRING(orptim, 3, 4))
END AS ertim2,
CASE orapdt
WHEN 0 THEN Varchar(0)
ELSE Varchar_format(CHAR(orapdt), 'YYYY-MM-DD')
END ltdat2,
CASE oraptm
WHEN 0 THEN Varchar(0)
ELSE CONCAT(CONCAT(SUBSTRING(oraptm, 1, 2), ':'),
SUBSTRING(oraptm, 3, 4))
END AS lttim2,
CASE orddat
WHEN 0 THEN Varchar(0)
ELSE Varchar_format(CHAR(orddat), 'YYYY-MM-DD')
END dldat2,
CASE ordtim
WHEN 0 THEN Varchar(0)
ELSE CONCAT(CONCAT(SUBSTRING(ordtim, 1, 2), ':'),
SUBSTRING(ordtim, 3, 4))
END AS dltim2,
orestr,
a.ordv# ordv_,
orcons,
oreqty,
orspec,
a.orstp# orstp_,
orcomc,
( CASE
WHEN mmtotal IS NOT NULL THEN mmtotal
ELSE 0
END ) mmtotal,
orwgt,
orocty,
orost,
ordcty,
ordst,
orara asarea,
orpdrv oprdrv,
orld# orld_,
ordsp# ordsp_,
orshdt,
orshtm,
ornwpk,
( CASE
WHEN equipmentnumber IS NOT NULL THEN equipmentnumber
ELSE ''
END ) EquipmentNumber,
( CASE
WHEN apptreq IS NOT NULL THEN apptreq
ELSE 'N'
END ) apptreq,
( CASE
WHEN apptmade IS NOT NULL THEN apptmade
ELSE 'N'
END ) apptmade,
( CASE
WHEN ununit IS NOT NULL THEN ununit
ELSE ' '
END ) UNUNIT,
( CASE
WHEN unsupr IS NOT NULL THEN unsupr
ELSE ' '
END ) asdrmgr,
( CASE
WHEN unfmgr IS NOT NULL THEN unfmgr
ELSE ' '
END ) asflmgr,
( CASE
WHEN untrl1 IS NOT NULL THEN untrl1
ELSE ' '
END ) UNTRL1
FROM iesqafile.order a
LEFT OUTER JOIN ordermiles
ON mmord# = a.orodr#
LEFT OUTER JOIN firstequiprow
ON a.orodr# = oeord#
LEFT OUTER JOIN stopgroup
ON a.orodr# = stoporder
LEFT OUTER JOIN iesqafile.units
ON ununit = a.orpdrv
WHERE orld# <> ordsp#
AND ( orspec = 'N# C'
OR orspec = 'N# P' )
AND orpdrv <> ''
AND orpdat >= 2018001
UNION
SELECT d.orodr# as ordddd,
orcust,
orldat,
CASE orpdat
WHEN 0 THEN Varchar(0)
ELSE Varchar_format(CHAR(orpdat), 'YYYY-MM-DD')
END erdat2,
CASE orptim
WHEN 0 THEN Varchar(0)
ELSE CONCAT(CONCAT(SUBSTRING(orptim, 1, 2), ':'),
SUBSTRING(orptim, 3, 4))
END AS ertim2,
CASE orapdt
WHEN 0 THEN Varchar(0)
ELSE Varchar_format(CHAR(orapdt), 'YYYY-MM-DD')
END ltdat2,
CASE oraptm
WHEN 0 THEN Varchar(0)
ELSE CONCAT(CONCAT(SUBSTRING(oraptm, 1, 2), ':'),
SUBSTRING(oraptm, 3, 4))
END AS lttim2,
CASE orddat
WHEN 0 THEN Varchar(0)
ELSE Varchar_format(CHAR(orddat), 'YYYY-MM-DD')
END dldat2,
CASE ordtim
WHEN 0 THEN Varchar(0)
ELSE CONCAT(CONCAT(SUBSTRING(ordtim, 1, 2), ':'),
SUBSTRING(ordtim, 3, 4))
END AS dltim2,
orestr,
ordv#,
orcons,
oreqty,
orspec,
orstp#,
orcomc,
( CASE
WHEN mmtotal IS NOT NULL THEN mmtotal
ELSE 0
END ) mmtotal,
orwgt,
orocty,
orost,
ordcty,
ordst,
orara,
orpdrv,
orld#,
ordsp#,
orshdt,
orshtm,
ornwpk,
( CASE
WHEN equipmentnumber IS NOT NULL THEN equipmentnumber
ELSE ' '
END ) EquipmentNumber,
( CASE
WHEN apptreq IS NOT NULL THEN apptreq
ELSE 'N'
END ) apptreq,
( CASE
WHEN apptmade IS NOT NULL THEN apptmade
ELSE 'N'
END ) apptmade,
( CASE
WHEN ununit IS NOT NULL THEN ununit
ELSE ' '
END ) UNUNIT,
( CASE
WHEN unsupr IS NOT NULL THEN unsupr
ELSE ' '
END ) UNSUPR,
( CASE
WHEN unfmgr IS NOT NULL THEN unfmgr
ELSE ' '
END ) UNFMGR,
( CASE
WHEN untrl1 IS NOT NULL THEN untrl1
ELSE ' '
END ) UNTRL1
FROM iesqafile.opplan
LEFT OUTER JOIN iesqafile.order d
ON d.orodr# = opord#
LEFT OUTER JOIN ordermiles
ON mmord# = d.orodr#
LEFT OUTER JOIN firstequiprow
ON d.orodr# = oeord#
LEFT OUTER JOIN stopgroup
ON d.orodr# = stoporder
LEFT OUTER JOIN iesqafile.units
ON ununit = d.orpdrv
So my first attempt to create the view was simply to add a CREATE VIEW AS at the beginning of the first statement. This resulted in the error below:
A column list must be specified because the result columns are unnamed.
I am failing to understand this error as the column headings are indeed specified as the select works without issues. All columns are displayed with appropriate headings.
However I tried to modify the query by adding the below instead of the simple create view.
create view pavt.v1 (v1,v2,v3,v4,v5,v6,v7,v8,v9,v10,v11,v12,v13,v14,v15,v16,v17,v18,v19,v20,v21,v22,v23,v24,v25,v26,v27,v28,v29,v30,v31,v32,v33,v34,v35,v36) as
This seemed to have worked and the view was created in library PAVT. However when I run a select on the view, I get an aritmetic overflow error with DB2 error code of -802.
I dont understand this as I am able to view the results but the issue comes only while attempting to create the query. Can somebody guide please?
A more detailed error description is below:
Message . . . . : Select or omit error on field
Cast(Translate(ORDER_14.ORPTIM, *UNNAMED Table) AS member V.
Cause . . . . . : A select or omit error occurred in record 0, record format
*FIRST, member number 1 of file V in library PAVT, because of condition 1 of
the following conditions:
1 - The data was not valid in a decimal field.
At this moment what I really want to know is if the method I am following to create the view is correct (atleast as far as the syntax goes). Maybe the error I am seeing is a data error?
Edit-1:
create view pavt.CCC1 as
WITH firstequiprrn
AS (SELECT oeord# equiporder,
Min(RRN(a)) firstrow
FROM iesqafile.OPEQUIP a
GROUP BY oeord#
ORDER BY 1),
firstequiprow
AS (SELECT oeord#,
oetrlr equipmentnumber
FROM firstequiprrn
INNER JOIN iesqafile.OPEQUIP b
ON equiporder = oeord#
AND firstrow = RRN(b)),
ordermiles
AS (SELECT mmord#,
mmtotal
FROM iesqafile.mmiles
WHERE mmord# IN(SELECT orodr#
FROM iesqafile.order)
AND mmrectype = 'O'
AND mmdsp# = '00'),
stopgroup
AS (SELECT soord stoporder,
COUNT(*) stopsremain,
Min(sostp#) nextstop,
Max(soappr) apptreq,
Max(soaptm) apptmade
FROM iesqafile.stopoff
INNER JOIN iesqafile.order
ON orodr# = soord
WHERE soardt = 0
GROUP BY soord
ORDER BY 1) SELECT a.orodr# orodr_,
orcust,
orldat,
CASE orpdat
WHEN 0 THEN Varchar(0)
ELSE Varchar_format(CHAR(orpdat), 'YYYY-MM-DD')
END erdat2,
CASE orptim
WHEN 0 THEN Varchar(0)
ELSE CONCAT(CONCAT(SUBSTRING(char(orptim), 1, 2), ':'),
SUBSTRING(char(orptim), 3, 4))
END AS ertim2,
CASE orapdt
WHEN 0 THEN Varchar(0)
ELSE Varchar_format(CHAR(orapdt), 'YYYY-MM-DD')
END ltdat2,
CASE oraptm
WHEN 0 THEN Varchar(0)
ELSE CONCAT(CONCAT(SUBSTRING(oraptm, 1, 2), ':'),
SUBSTRING(oraptm, 3, 4))
END AS lttim2,
CASE orddat
WHEN 0 THEN Varchar(0)
ELSE Varchar_format(CHAR(orddat), 'YYYY-MM-DD')
END dldat2,
CASE ordtim
WHEN 0 THEN Varchar(0)
ELSE CONCAT(CONCAT(SUBSTRING(ordtim, 1, 2), ':'),
SUBSTRING(ordtim, 3, 4))
END AS dltim2,
orestr,
a.ordv# ordv_,
orcons,
oreqty,
orspec,
a.orstp# orstp_,
orcomc,
( CASE
WHEN mmtotal IS NOT NULL THEN mmtotal
ELSE 0
END ) mmtotal,
orwgt,
orocty,
orost,
ordcty,
ordst,
orara asarea,
orpdrv oprdrv,
orld# orld_,
ordsp# ordsp_,
orshdt,
orshtm,
ornwpk,
( CASE
WHEN equipmentnumber IS NOT NULL THEN equipmentnumber
ELSE ''
END ) EquipmentNumber,
( CASE
WHEN apptreq IS NOT NULL THEN apptreq
ELSE 'N'
END ) apptreq,
( CASE
WHEN apptmade IS NOT NULL THEN apptmade
ELSE 'N'
END ) apptmade,
( CASE
WHEN ununit IS NOT NULL THEN ununit
ELSE ' '
END ) UNUNIT,
( CASE
WHEN unsupr IS NOT NULL THEN unsupr
ELSE ' '
END ) asdrmgr,
( CASE
WHEN unfmgr IS NOT NULL THEN unfmgr
ELSE ' '
END ) asflmgr,
( CASE
WHEN untrl1 IS NOT NULL THEN untrl1
ELSE ' '
END ) UNTRL1
FROM iesqafile.order a
LEFT OUTER JOIN ordermiles
ON mmord# = a.orodr#
LEFT OUTER JOIN firstequiprow
ON a.orodr# = oeord#
LEFT OUTER JOIN stopgroup
ON a.orodr# = stoporder
LEFT OUTER JOIN iesqafile.units
ON ununit = a.orpdrv
WHERE orld# <> ordsp#
AND ( orspec = 'N# C'
OR orspec = 'N# P' )
AND orpdrv <> ''
AND orpdat >= 2018001
UNION
SELECT d.orodr# orodr_,
orcust,
orldat,
CASE orpdat
WHEN 0 THEN Varchar(0)
ELSE Varchar_format(CHAR(orpdat), 'YYYY-MM-DD')
END erdat2,
CASE orptim
WHEN 0 THEN Varchar(0)
ELSE CONCAT(CONCAT(SUBSTRING(char(orptim), 1, 2), ':'),
SUBSTRING(char(orptim), 3, 4))
END AS ertim2,
CASE orapdt
WHEN 0 THEN Varchar(0)
ELSE Varchar_format(CHAR(orapdt), 'YYYY-MM-DD')
END ltdat2,
CASE oraptm
WHEN 0 THEN Varchar(0)
ELSE CONCAT(CONCAT(SUBSTRING(oraptm, 1, 2), ':'),
SUBSTRING(oraptm, 3, 4))
END AS lttim2,
CASE orddat
WHEN 0 THEN Varchar(0)
ELSE Varchar_format(CHAR(orddat), 'YYYY-MM-DD')
END dldat2,
CASE ordtim
WHEN 0 THEN Varchar(0)
ELSE CONCAT(CONCAT(SUBSTRING(ordtim, 1, 2), ':'),
SUBSTRING(ordtim, 3, 4))
END AS dltim2,
orestr,
ordv# ordv_,
orcons,
oreqty,
orspec,
orstp# orstp_,
orcomc,
( CASE
WHEN mmtotal IS NOT NULL THEN mmtotal
ELSE 0
END ) mmtotal,
orwgt,
orocty,
orost,
ordcty,
ordst,
orara asarea,
orpdrv oprdrv,
orld# orld_,
ordsp# ordsp_,
orshdt,
orshtm,
ornwpk,
( CASE
WHEN equipmentnumber IS NOT NULL THEN equipmentnumber
ELSE ' '
END ) EquipmentNumber,
( CASE
WHEN apptreq IS NOT NULL THEN apptreq
ELSE 'N'
END ) apptreq,
( CASE
WHEN apptmade IS NOT NULL THEN apptmade
ELSE 'N'
END ) apptmade,
( CASE
WHEN ununit IS NOT NULL THEN ununit
ELSE ' '
END ) UNUNIT,
( CASE
WHEN unsupr IS NOT NULL THEN unsupr
ELSE ' '
END ) asdrmgr,
( CASE
WHEN unfmgr IS NOT NULL THEN unfmgr
ELSE ' '
END ) asflmgr,
( CASE
WHEN untrl1 IS NOT NULL THEN untrl1
ELSE ' '
END ) UNTRL1
FROM iesqafile.opplan
LEFT OUTER JOIN iesqafile.order d
ON d.orodr# = opord#
LEFT OUTER JOIN ordermiles
ON mmord# = d.orodr#
LEFT OUTER JOIN firstequiprow
ON d.orodr# = oeord#
LEFT OUTER JOIN stopgroup
ON d.orodr# = stoporder
LEFT OUTER JOIN iesqafile.units
ON ununit = d.orpdrv

Answer 1

The first error is because in your 2 main SELECT statements (being UNIONed together) you have different column names - so the View doesn't know what to call them and is requiring you to explicitly name them e.g. the first column in each statement:
SELECT a.orodr# orodr_ ...
SELECT d.orodr# as ordddd ...
For the 2nd error, what is the datatype of the ORPTIM column?
I'm guessing that this type of construct is causing the issue:
CASE orptim
WHEN 0
THEN Varchar(0)
ELSE CONCAT(CONCAT(SUBSTRING(orptim, 1, 2), ':'), SUBSTRING(orptim, 3, 4))
If orptim is a number/decimal then "WHEN 0" will work but "SUBSTRING(orptim, 1, 2)" won't - as you can't substring a number. If orptim is a string then "WHEN 0" w=may be casuing problems.