I am using a statement as below and get this error:
SELECT Failed. 3771: Illegal expression in WHEN clause of CASE
expression.
I had better hopes from Teradata. SQL Server can do it but Teradata can't.
How can I work around this? Any solution?
sel ( CASE
WHEN EXISTS ( sel '1' from VolatileTable Dtb1 where Dtb1.c1=FACT_Table_5MillionRows.C1)
THEN "FACTTablew5MillionRows"."CustomColumName"
ELSE 'ALL OTHER'
END ) (NAMED "CustomColumName" )
from
"Db"."FACTTablew5MillionRows"
Replace
WHEN EXISTS (...)
By
WHEN 1 = (SELECT 1 WHERE EXISTS (...))
Teradata doesn't like EXISTS in Correlated Scalar Subqueries within a CASE, but you can rewrite it like this:
select
( CASE
WHEN C1 = ( select MIN(C1) from VolatileTable Dtb1
where Dtb1.c1=ft.C1)
THEN ft."CustomColumName"
ELSE 'ALL OTHER'
END ) (NAMED "CustomColumName" )
from
"Db"."FACTTablew5MillionRows" as ft
If VolatileTable.C1 is unique you can remove the MIN.
But in 95% logic like this can be replaced by a LEFT JOIN:
select
ft.*,
CASE WHEN Dtb1.c1 IS NOT NULL
THEN ft."CustomColumName"
ELSE 'ALL OTHER'
end as "CustomColumName"
from "Db"."FACTTablew5MillionRows" as ft
left join VolatileTable Dtb1
on Dtb1.c1=ft.C1
This will return duplicated rows if VolatileTable.C1 is not unique, then you need to change it to:
from "Db"."FACTTablew5MillionRows" as ft
left join (select distinct C1 from VolatileTable) Dtb1
on Dtb1.c1=ft.C1
WHEN EXISTS (select '1' from VolatileTable Dtb1
where Dtb1.c1=FACT_Table_5MillionRows.C1)
THEN somevalue --or a statement that yields a scalar value
You were selecting a column in the then part, where you should be assigning a unique value.
Related
I have a where Clause that I need to check if values exists in a table, and I'm doing that in a (subquery). The problem is, that should be made based on
values - 'FIX' and 'VAR'. Depending on each, we need to check on a different table (subquery). To achieve that goal I'm using a Case When statement in the where clause, as shown below:
select *
FROM T1
where
(upper(trim(ITAXAVAR)) = 'S'
and
(
upper(trim(CTIPAMOR)) not in ('A','U','F')
)
)
and
--problem starts here.....
(case ucase(trim(CTIPTXFX)) --Values 'FIX';'VAR';'PUR'
WHEN 'FIX'
THEN
(concat(trim(CPRZTXFX),trim(CTAXAREF)) not in
(select trim(A.tayd91c0_celemtab)
from cd_estruturais.tat91_tabelas A
where A.tayd91c0_ctabela = 'W03' and
--data_date_part = '${Data_ref}' and --por vezes não temos actualização TAT91 para mesma data_ref das tabelas
A.data_date_part = (select max(B.data_date_part)
from cd_estruturais.tat91_tabelas B
where A.tayd91c0_ctabela = B.tayd91c0_ctabela and
B.data_date_part > date_add(TO_DATE(FROM_UNIXTIME(UNIX_TIMESTAMP())),-5)
)
and length(nvl(trim(A.tayd91c0_celemtab),'')) <> 0
)
)
WHEN 'VAR'
THEN
(concat(trim(CTAXAREF),trim(CPERRVTX)) not in
(select concat(trim(A.CTXREF),trim(A.CPERRVTX))
from land_estruturais.cat01_taxref A
where A.data_date_part > date_add(TO_DATE(FROM_UNIXTIME(UNIX_TIMESTAMP())),-5)
and length(nvl(concat(trim(A.CTXREF),trim(A.CPERRVTX)),'')) <> 0
)
)
END
)
;
Below is a simplified view of the same query:
select *
FROM T1
where
(--first criteria
)
and
--problem starts here.....
(case ucase(trim(CTIPTXFX)) --Values 'FIX';'VAR';'PUR'
WHEN 'FIX'
THEN
(field1 not in
(subquery 1)
)
WHEN 'VAR'
THEN
(field1 not in
(subquery 2)
END
)
;
Can anyone tell me what I'm doing wrong, please?
I seems to me that Impala does not support the subqueries inside a Case When Statement.
Thank you.
Impala doesnt support Subqueries in the select list.
So, you need to rewrite the SQL like below -
Use LEFT ANTI JOIN in place of NOT IN() to link subqueries to T1.
To handle case when, use UNION ALL for different conditions.
SELECT * FROM T1
LEFT ANTI JOIN subqry1 y ON T1.id = y.id
WHERE col='FIX'
UNION ALL
SELECT * FROM T1
LEFT ANTI JOIN subqry2 y ON T1.id = y.id
WHERE col='VAR'
I tried to change the simple SQL you posted above. The main SQL is too complex and need table setup and data to prove the logic.
Here is my version of your simple SQL -
select * FROM T1
LEFT ANTI JOIN subquery1 ON subquery1.column = T1.field1
where (--first criteria )
and ucase(trim(CTIPTXFX))='FIX'
UNION ALL
select * FROM T1
LEFT ANTI JOIN subquery2 ON subquery2.column = T1.field1
where (--first criteria )
and ucase(trim(CTIPTXFX))='VAR'
Pls note, Anti join and union all can be expensive so if your table size if huge, please tune them accordingly.
I have a query like this:
SELECT
jobs.*,
(
CASE
WHEN lead_informations.state IS NOT NULL THEN lead_informations.state
ELSE 'NEW'
END
) AS lead_state
FROM
jobs
LEFT JOIN lead_informations ON
lead_informations.job_id = jobs.id
AND
lead_informations.mechanic_id = 3
WHERE
lead_state = 'NEW'
Which gives the following error:
PGError: ERROR: column "lead_state" does not exist
LINE 1: ...s.id AND lead_informations.mechanic_id = 3 WHERE (lead_state...
In MySql this is valid, but apparently not in Postgresql. From what I can gather, the reason is that the SELECT part of the query is evaluated later than the WHERE part. Is there a common workaround for this problem?
I struggled on the same issue and "mysql syntax is non-standard" is not a valid argument in my opinion. PostgreSQL adds handy non-standard extensions as well, for example "INSERT ... RETURNING ..." to get auto ids after inserts. Also, repeating large queries is not an elegant solution.
However, I found the WITH statement very helpful (CTE's). It sort of creates a temporary view within the query which you can use like a usual table then. I'm not sure if I have rewritten your JOIN correctly, but in general it should work like this:
WITH jobs_refined AS (
SELECT
jobs.*,
(SELECT CASE WHEN lead_informations.state IS NOT NULL THEN lead_informations.state ELSE 'NEW' END) AS lead_state
FROM jobs
LEFT JOIN lead_informations
ON lead_informations.job_id = jobs.id
AND lead_informations.mechanic_id = 3
)
SELECT *
FROM jobs_refined
WHERE lead_state = 'NEW'
You would need to either duplicate the case statement in the where clause, or my preference is to do something like the following:
SELECT *
FROM (
SELECT
jobs.*,
(CASE WHEN lead_informations.state IS NOT NULL THEN lead_informations.state ELSE 'NEW' END) as lead_state
FROM
"jobs"
LEFT JOIN lead_informations ON lead_informations.job_id = jobs.id
AND lead_informations.mechanic_id = 3
) q1
WHERE (lead_state = 'NEW')
MySQL's support is, as you experienced, non-standard. The correct way is to reprint the same expression used in the SELECT clause:
SELECT
jobs.*,
CASE
WHEN lead_informations.state IS NOT NULL THEN lead_informations.state
ELSE 'NEW'
END AS lead_state
FROM
jobs
LEFT JOIN lead_informations ON
lead_informations.job_id = jobs.id
AND
lead_informations.mechanic_id = 3
WHERE
lead_informations.state IS NULL
I believe the common solution is to use an inner SELECT for the calculation (or CASE statement in this case) so that the result of the inner SELECT is available to the entire outer query by the time the execution gets to that query. Otherwise, the WHERE clause is evaluated first and knows nothing about the SELECT clause.
Subquery:
SELECT "tab_1"."BirthDate", "tab_1"."col_1" FROM (
SELECT BirthDate, DATEADD(year, 18, BirthDate) AS "col_1" FROM Employees
) AS "tab_1"
WHERE "tab_1"."col_1" >= '2000-12-31';
I used alias in where like this. (Sub Query).
Select "Vendors"."VendorId", "Vendors"."Name","Result"."Total"
From (Select "Trans"."VendorId", ("Trans"."A"+"Trans"."B"+"Trans"."C") AS "Total"
FROM "Trans"
WHERE "Trans"."Year"=2014
) As "Result"
JOIN "Vendors" ON "Result"."VendorId"="Vendors"."VendorId"
WHERE "Vendors"."Class"='I' AND "Result"."Total" > 200
Here is my query:
SELECT DISTINCT v.codi, m.nom, v.matricula, v.data_compra, v.color,
v.combustible, v.asseguranca,
(CASE WHEN lloguer.dataf IS NOT NULL THEN 'Si' ELSE 'Llogat' END) AS Disponible
FROM vehicle v
INNER JOIN model m on model_codi=m.codi
INNER JOIN lloguer on codi_vehicle=v.codi
WHERE Disponible='Si';
What I'm trying to do it's to show only those rows that have the "lloguer.dataf" is not NULL, but it doesn't alow me to use the "Disponible" alias to do the last line comparison.
What can I do?
This is how the info is shown (with some more atribute) without the last line comparison.
The problem is the alias doesnt exists yet. So you have to repeat the full code or create a subquery.
SELECT *
FROM ( .... ) YourQuery
WHERE Disponible='Si';
You can read more details here https://community.oracle.com/thread/1109532?tstart=0
Remove your CASE WHEN from the SELECT block and replace your WHERE clause with:
WHERE lloguer.dataf IS NOT NULL
I'm a TSQL guy by nature, but can you do this?
Select distinct codi, nom,matricula, data_compra, colour, combustible, asseguranca from
(SELECT DISTINCT v.codi, m.nom, v.matricula, v.data_compra, v.color,
v.combustible, v.asseguranca,
(CASE WHEN lloguer.dataf IS NOT NULL THEN 'Si' ELSE 'Llogat' END) AS Disponible
FROM vehicle v
INNER JOIN model m on model_codi=m.codi
INNER JOIN lloguer on codi_vehicle=v.codi)
WHERE Disponible='Si';
As #JuanCarlosOropeza has stated, the alias doesn't exist until the data is initially fetched. This is why you would be able to use the alias in an order by clause without using a subquery, but not in the where clause as the data hasn't been fetched yet.
I'm getting the error
A SELECT statement that assigns a value to a variable must not be combined with data-retrieval operations.
Here's my SELECT statement.
SELECT A.vendor_id, **#vendor_employee** = A.vendor_employee_id
, B.txt_first_name, B.txt_last_name,
SELECT txt_Vendor_Employee_Detail_Element,
(CASE
WHEN txt_Vendor_Employee_Detail_Value <> ''
AND txt_Vendor_Employee_Detail_Value IS NOT NULL
THEN txt_Vendor_Employee_Detail_Value
ELSE CONVERT(VARCHAR, txt_Vendor_Employee_Detail_Date)
END) AS Vendor_Detail_Element_Value
FROM t_vendor_employee_detail
WHERE vendor_employee_id = **#vendor_employee**)
FROM...
Yes, basically you can't return data and assign variables in the same select statement. What I think you intend to do is a correlated subquery which references an outer value.
That wolud look something like this:
SELECT A.vendor_id, A.vendor_employee_id
, B.txt_first_name, B.txt_last_name,
(SELECT d.txt_Vendor_Employee_Detail_Element
FROM t_vendor_employee_detail d
WHERE d.vendor_employee_id = A.Vendor_employee_id /* references outside the subqquery */)
FROM...
but you are also returning multiple rows in your subquery which should probably be rewritten as a join.
SELECT A.vendor_id, A.vendor_employee_id
, B.txt_first_name, B.txt_last_name,
d.txt_Vendor_Employee_Detail_Element,
(CASE
WHEN D.txt_Vendor_Employee_Detail_Value <> ''
AND d.txt_Vendor_Employee_Detail_Value IS NOT NULL
THEN d.txt_Vendor_Employee_Detail_Value
ELSE CONVERT(VARCHAR, d.txt_Vendor_Employee_Detail_Date)
END) AS Vendor_Detail_Element_Value
FROM vendor_table_A A
INNER JOIN t_vendor_employee_detail d
ON d.vendor_employee_id = A.vendor_employee_id
INNER JOIN vendor_table_B B
ON...
These examples will give you the basic idea but we would really need the whole query to give you a complete solution.
This looks like something that could be rewritten using a JOIN. It's hard to say how without seeing the whole query, but here is an attempt:
SELECT A.vendor_id, A.vendor_employee_id
, B.txt_first_name, B.txt_last_name,
c.txt_Vendor_Employee_Detail_Element,
(CASE
WHEN c.txt_Vendor_Employee_Detail_Value <> ''
AND c.txt_Vendor_Employee_Detail_Value IS NOT NULL
THEN c.txt_Vendor_Employee_Detail_Value
ELSE CONVERT(VARCHAR, c.txt_Vendor_Employee_Detail_Date)
END) AS Vendor_Detail_Element_Value
FROM ...
INNER JOIN t_vendor_employee_detail c
ON c.vendor_employee_id = A.vendor_employee_id
As the error message says, you cannot use a variable in the way you are trying.
You can retrieve and assign data altogether using a merge statement.
Something like this:
DECLARE #ID TABLE (
ID INT
)
MERGE INTO #ID
USING (
select 1 a,2 b,3 c
) as src
ON ( 1 = 2 )
WHEN NOT MATCHED THEN
INSERT (ID)
VALUES (Src.a)
OUTPUT src.b, src.c
;
SELECT * FROM #ID
I have a query like this:
SELECT
jobs.*,
(
CASE
WHEN lead_informations.state IS NOT NULL THEN lead_informations.state
ELSE 'NEW'
END
) AS lead_state
FROM
jobs
LEFT JOIN lead_informations ON
lead_informations.job_id = jobs.id
AND
lead_informations.mechanic_id = 3
WHERE
lead_state = 'NEW'
Which gives the following error:
PGError: ERROR: column "lead_state" does not exist
LINE 1: ...s.id AND lead_informations.mechanic_id = 3 WHERE (lead_state...
In MySql this is valid, but apparently not in Postgresql. From what I can gather, the reason is that the SELECT part of the query is evaluated later than the WHERE part. Is there a common workaround for this problem?
I struggled on the same issue and "mysql syntax is non-standard" is not a valid argument in my opinion. PostgreSQL adds handy non-standard extensions as well, for example "INSERT ... RETURNING ..." to get auto ids after inserts. Also, repeating large queries is not an elegant solution.
However, I found the WITH statement very helpful (CTE's). It sort of creates a temporary view within the query which you can use like a usual table then. I'm not sure if I have rewritten your JOIN correctly, but in general it should work like this:
WITH jobs_refined AS (
SELECT
jobs.*,
(SELECT CASE WHEN lead_informations.state IS NOT NULL THEN lead_informations.state ELSE 'NEW' END) AS lead_state
FROM jobs
LEFT JOIN lead_informations
ON lead_informations.job_id = jobs.id
AND lead_informations.mechanic_id = 3
)
SELECT *
FROM jobs_refined
WHERE lead_state = 'NEW'
You would need to either duplicate the case statement in the where clause, or my preference is to do something like the following:
SELECT *
FROM (
SELECT
jobs.*,
(CASE WHEN lead_informations.state IS NOT NULL THEN lead_informations.state ELSE 'NEW' END) as lead_state
FROM
"jobs"
LEFT JOIN lead_informations ON lead_informations.job_id = jobs.id
AND lead_informations.mechanic_id = 3
) q1
WHERE (lead_state = 'NEW')
MySQL's support is, as you experienced, non-standard. The correct way is to reprint the same expression used in the SELECT clause:
SELECT
jobs.*,
CASE
WHEN lead_informations.state IS NOT NULL THEN lead_informations.state
ELSE 'NEW'
END AS lead_state
FROM
jobs
LEFT JOIN lead_informations ON
lead_informations.job_id = jobs.id
AND
lead_informations.mechanic_id = 3
WHERE
lead_informations.state IS NULL
I believe the common solution is to use an inner SELECT for the calculation (or CASE statement in this case) so that the result of the inner SELECT is available to the entire outer query by the time the execution gets to that query. Otherwise, the WHERE clause is evaluated first and knows nothing about the SELECT clause.
Subquery:
SELECT "tab_1"."BirthDate", "tab_1"."col_1" FROM (
SELECT BirthDate, DATEADD(year, 18, BirthDate) AS "col_1" FROM Employees
) AS "tab_1"
WHERE "tab_1"."col_1" >= '2000-12-31';
I used alias in where like this. (Sub Query).
Select "Vendors"."VendorId", "Vendors"."Name","Result"."Total"
From (Select "Trans"."VendorId", ("Trans"."A"+"Trans"."B"+"Trans"."C") AS "Total"
FROM "Trans"
WHERE "Trans"."Year"=2014
) As "Result"
JOIN "Vendors" ON "Result"."VendorId"="Vendors"."VendorId"
WHERE "Vendors"."Class"='I' AND "Result"."Total" > 200