How to use NVL function between case statements? - vertica

I have multiple case statements like below
MAX(CASE When id = 'a' then value else null)
I want to use NVL function to display that if it is null display as '0'.
how can i do this?
Any help would be great!

Yes. you can use the same way in vertica also.
NVL(MAX(CASE When id = 'a' then value else null),0)
For more detatils refer to this link.

Related

Data exists within database but doesnt show up on webi report

Hi I am building a v simple report as below; when I include the customer reference number and filter for another column (resolved time) being NULL then the number of incidents are reduced. (I know they exist within the database with the same filters)
(only INC1988464 is showing when more incidents should be showing)
Is there a way to test issues such as this in webi? Or a way to resolve this? Thanks in advance
Here is the sql used to make the report:
SELECT
'INC'||TRIM(to_char(ead_incident.incident,'0000000')),
ead_incident_credit.circuit_ref,
ead_incident_credit.customer_ref,
ead_incident_credit.data_rate,
ead_incident_credit.connection_type,
ead_incident_credit.completed_date,
ead_incident_credit.wholesaler_name,
ead_incident_credit.opened_datetime,
ead_incident_credit.resolved_datetime,
ead_incident_credit.resolution_details,
ead_incident_credit.resolution_duration_seconds,
ead_incident_credit.access_circuit_core_network,
ead_incident_credit.charge_amount,
ead_incident_credit.or_cost,
ead_incident_credit.sky_cost,
ead_incident_credit.service_credit_applicable,
ead_incident_credit.service_credit_due,
CASE WHEN COALESCE(COALESCE(ead_incident.actual_end_datetime,ead_incident.impact_end_datetime),ead_incident.resolved_datetime) IS NOT NULL THEN CASE WHEN ead_incident.impact_type = 'Full Outage' AND COALESCE(ead_incident.cause_classification,'') <> 'Resolved - No fault found' AND COALESCE(odwh_data.ead_within_sla('TTR',ead_incident.opened_datetime, COALESCE(COALESCE(ead_incident.actual_end_datetime,ead_incident.impact_end_datetime),ead_incident.resolved_datetime)),'f') = 'f' THEN 'Y' ELSE 'N' END ELSE NULL END,
CASE WHEN ead_incident.correlation = 't' THEN 'Y' ELSE 'N' END,
odwh_system.kpi_nextweek_startdate(),
odwh_system.kpi_currentweek_startdate()
FROM
odwh_data.ead_incident ead_incident INNER JOIN odwh_data.ead_incident_credit ead_incident_credit ON (ead_incident_credit.incident=ead_incident.incident)
WHERE
(
CASE WHEN COALESCE(COALESCE(ead_incident.actual_end_datetime,ead_incident.impact_end_datetime),ead_incident.resolved_datetime) IS NOT NULL THEN CASE WHEN ead_incident.impact_type = 'Full Outage' AND COALESCE(ead_incident.cause_classification,'') <> 'Resolved - No fault found' AND COALESCE(odwh_data.ead_within_sla('TTR',ead_incident.opened_datetime, COALESCE(COALESCE(ead_incident.actual_end_datetime,ead_incident.impact_end_datetime),ead_incident.resolved_datetime)),'f') = 'f' THEN 'Y' ELSE 'N' END ELSE NULL END = 'Y'
AND
(
CASE WHEN ead_incident.deleted = 't' THEN 'Y' ELSE 'N' END = 'N'
AND
(
CASE WHEN ead_incident.wholesaler = 't' THEN 'Y' WHEN ead_incident.wholesaler = 'f' THEN 'N' END = 'Y'
OR
CASE WHEN ead_incident.wholesaler = 't' THEN 'Y' WHEN ead_incident.wholesaler = 'f' THEN 'N' END Is Null
)
)
)
If you can create a free-hand SQL query which exhibits your issue like this...
SELECT
'INC1988464' AS [Incident Number]
, 'SKY-COLT-003' AS [Customer Reference]
, CONVERT (DATETIME, '2022-05-08 11:17:49') AS [Resovled Time]
UNION
SELECT
'INC1988464' AS [Incident Number]
, 'SKY-COLT-005' AS [Custome rReference]
, CONVERT (DATETIME, '2022-05-09 9:03:21') AS [Resovled Time]
UNION
SELECT
'INC1988464' AS [Incident Number]
, 'SKY-COLT-007' AS [Customer Reference]
, NULL AS [Resovled Time]
UNION
SELECT
'INC1988464' AS [Incident Number]
, 'SKY-COLT-009' AS [Customer Reference]
, CONVERT (DATETIME, '2022-05-09 10:17:02') AS [Resovled Time];
Then we can take that query, put it into a WebI report, replicate the issue, and possibly resolve it.
First and easiest thing to check. Do you have any filters already on your report page or are you starting on a brand new page? The filters may be against the page or the individual report block.
If you have, then remove them and see if the issue is resolved. Note that there may also be a ranking in there, returning the top 1 incidents.
If not, then there will be something in the report logic preventing the records from being returned. Comment out the where clauses and make sure to add the columns from the where clauses into your result set. From here you have two things to check:
1/ All rows are being returned
2/ You can see which rows are going to be filtered by your where clause based on what you see on your report based on your logic. You have nested case expressions which may not be doing what you expected for example.

Oracle PL/SQL How to Get All Rows When the Date Parameter is Null?

This is where statement of my query:
WHERE date_column LIKE
(CASE
WHEN :date_parameter IS NOT NULL
THEN
:date_parameter
ELSE '%%'
END)
...
If the parameter is null, I want to get all rows. How can I do this?
Try
WHERE (:date_parameter is null
OR date_column = :date_parameter)
I used to write
WHERE date_column = nvl(:date_parameter,date_column)
But I think people find it confusing to read.
This should be work:
WHERE (date_column = :date_parameter AND :date_parameter IS NOT NULL) OR :date_parameter IS NULL

Oracle: CaseState with ISNULL condition

I have the below case statement that is not capturing is null values. How can I add another criteria to capture when REGION_NAME is null
CASE WHEN M.OPER_STATE = 'AK' AND REGION_NAME IN ('NA','N/A','')
THEN 'Pacific'
ELSE T.REGION
END REGION
The folling row returns blank for region and should return Pacific.
Region Id REGION_NAME
1 (THIS VALUE IS NULL)
You can not check a value against null by checking if it's "equal" to null or to ''; you need to use IS [NOT] NULL:
... (REGION_NAME IN ('NA','N/A') OR REGION_NAME IS NULL) ...
You could even use NVL, but I would prefer the boolean way for clarity:
... (nvl(REGION_NAME, 'NA') IN ('NA','N/A') ...

Oracle replacing null using NVL check for empty rows

I am running a query to retrieve an integer but want to put a check for nulls. If null I want the query to return 0. How can I do that? I tried this below but it's not working
select NVL(A_COUNT, 0) from MYTABLE where VEH_YEAR = '2003';
If A_COUNT is null I want the query to return 0. In the above case I don't have a value 2003 in VEH_YEAR column. The query works if I have a value 2003 in VEH_YEAR column but A_COUNT is null.
Better version of your uery would be, using an Aggregate function like MAX before using NVL.
select NVL(MAX(A_COUNT),0) from MYTABLE where VEH_YEAR = '2003';
SELECT NVL((select A_COUNT from MYTABLE where VEH_YEAR = '2003'), 0) A_COUNT from dual;
This worked.

is there a way to add custom query to a magento select rendered by a collection?

I have a magento collection for which if i echo the getSelect() function, i get a query something like this:
SELECT
`table1`.*,
`table`.*,
`table3.fieldy` AS 'fieldname'
.....
FROM ....
WHERE....
and i would like to change this query into something like this:
SELECT
`table1`.*,
`table`.*,
`table3.fieldy` AS 'fieldname',
(SELECT col1, col2, (case when (action == 2 and state == 0) then 1 else 0 end) as state from tbl1) AS 'fieldname2'
......
FROM....
WHERE....
now, for where clause for instance, you can add text to the query by using
productCollection->getSelect()->where('query text');
but how could I add custom query text to the first part of the select?
Many thanks
You can use Mage_Eav_Model_Entity_Collection_Abstract function addExpressionAttributeToSelect to add Subselect to your query.
Or just add new subselect field to select as:
$this->getSelect()->columns(array($alias => $fullExpression));
Note: $fullExpression should be wrapped in quotes.

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