How should I use the COALESCE function in PostgreSQL? - postgresql

I've written the following code:
UPDATE prueba t2
SET num = coalesce(t1.n_locnae, 0)
FROM prueba2 t1
WHERE t2.utm = t1.utm and t2.sem = t1.sem;
but it still includes null values in the column num.
How can it be solved?

You have values of utm and sem in prueba that you don't have in prueba2, so get filtered out by your UPDATE statement.
You probably need something like (untested):
UPDATE prueba pa
SET num = coalesce(p2.n_locnae, 0)
FROM prueba pb
LEFT JOIN prueba2 p2
ON (pb.utm,pb.sem) = (p2.utm,p2.sem)
WHERE (pa.utm,pa.sem) = (pb.utm,pb.sem);
This should ensure that all num values are updated, whether they their key is matched against the join or not.

Related

How to create an Update statement from a subquery in TSQL

I need to update all records that match my criteria. But the Sql below is giving this error:
Subquery returned more than 1 value. This is not permitted when the
subquery follows =, !=, <, <= , >, >= or when the subquery is used as
an expression.
-- Set MasterAccountId = NULL where there is no Receivable with equivalent BillingAccountId and TaskAccountId
UPDATE R
SET R.MasterAccountId = NULL
FROM Receivable R
WHERE EXISTS ( SELECT * FROM MasterAccount M
WHERE (ISNULL(M.BillingAccountId, 0) > 0 AND M.BillingAccountId = R.BillingAccountId) OR
(ISNULL(M.TaskAccountId, 0) > 0 AND M.TaskAccountId = R.TaskAccountId))
Basically, I need to update all records that return in that subquery.
Does any one know how to fix it?
Can you give a try on this. This is base from the repond of https://stackoverflow.com/users/40655/robin-day on this link How do I UPDATE from a SELECT in SQL Server?.
UPDATE
R
SET
R.MasterAccountId = NULL
FROM
Receivable R
INNER JOIN
MasterAccount M
ON
(ISNULL(M.BillingAccountId, 0) > 0 AND M.BillingAccountId = R.BillingAccountId) OR
(ISNULL(M.TaskAccountId, 0) > 0 AND M.TaskAccountId = R.TaskAccountId))
I don't think you are getting the said error in posted query May be somewhere else. Again in your EXISTS subquery, instead of saying select * ... it's always better to say WHERE EXISTS ( SELECT 1 FROM MasterAccount M
Also try using the JOIN version of this query instead like
UPDATE R
SET R.MasterAccountId = NULL
FROM Receivable R
JOIN MasterAccount M ON M.BillingAccountId = R.BillingAccountId
OR M.TaskAccountId = R.TaskAccountId
WHERE ISNULL(M.BillingAccountId, 0) > 0
OR ISNULL(M.TaskAccountId, 0) > 0;

Returning distinct columns from left outer join in db2

SELECT
nzy.NZPYYD
,nzy.NZZSYG
,nzy.NZJRYG
,acn.ANITCD
FROM
ACNTRA acn
LEFT OUTER JOIN NZYTFL nzy
ON (
nzy.NZCNO1 = acn.ANCNO1
AND nzy.NZCNO2 = acn.ANCNO2
AND nzy.NZCNO3 = acn.ANCNO3
AND nzy.NZCNO4 = acn.ANCNO4
AND nzy.NZCNO5 = acn.ANCNO5
AND nzy.NZSLKI = acn.ANSLKI
AND nzy.NZDLTM = ''
)
WHERE
acn.ANDLTM = ''
AND acn.ANTKCD = '1029'
AND nzy.NZTXKB = 1
The problem here is it gives 2 rows result.I want to get one unique row from the result of left outer join .Any help?
If both rows are identical, try
SELECT DISTINCT
nzy.NZPYYD
,nzy.NZZSYG
,nzy.NZJRYG
,acn.ANITCD
If not, you can try to SUM(), CONCAT(), MAX() or whatever the column with different values.
Difficult to be more precise without a sample output.

Setting a variable in T-SQL from a Query

So I have this query:
select ens_use_new_models_bit from cfo_transaction
inner join dbo.cfo_trans_entity_rel on te_tr_transaction_id=tr_transaction_id
inner join cfo_tran_quote on tq_tr_transaction_id = tr_transaction_id
left outer join cfo_engine_sponsor on ens_rs_sponsor_id = te_co_re_entity_id
where te_rv_rel_type_id=713 and tq_tran_quote_id = 3
It returns a bit value, which can also be NULL. I hardcoded 3 for testing but in reality another proc passes this value in, but that's not important here.
Now, in a stored proc, I need to set a variable that's declared in the proc:
SET #vRtn = NULL
as the string - either 'VBEngines' or 'WFModels', or keep it NULL if the bit from above returns NULL.
'VBEngines' if the bit is off, 'WFModels' if the bit is on.
Then after that, I need to perform a T-SQL condition on the value, to see if it's NULL or not. How would I do this? I'm so bad with SQL.
Thanks.
Assuming that you don't need the bit value itself stored in a variable as that was just a means to an end then this should do it.
select #vRtn = case ens_use_new_models_bit
when 0 then 'VBEngines'
when 1 then 'WFModels'
end /*Implicit Else NULL case*/
from cfo_transaction ...
In the case 0 rows are returned no assignment is made so #vRtn keeps its initial value,
declare #newmodelsbit bit, #vRtn varchar(10)
select #newmodelsbit = ens_use_new_models_bit from cfo_transaction
inner join dbo.cfo_trans_entity_rel on te_tr_transaction_id=tr_transaction_id
inner join cfo_tran_quote on tq_tr_transaction_id = tr_transaction_id
left outer join cfo_engine_sponsor on ens_rs_sponsor_id = te_co_re_entity_id
where te_rv_rel_type_id=713 and tq_tran_quote_id = 3
if #newmodelsbit is null
begin
set #vRtn = null
end
else
begin
if #newmodelsbit = 1 --bit is on
begin
set #vRtn = 'WFModels'
end
else -- bit is off
begin
set #vRtn = ' VBEngines'
end
end

tsql : Access query to TSQL union update conversion correct?

I have a query in access which i need to convert to a stored proc in sql server 2005.
the query in access is as follows:
UPDATE
tblitem,
tblFileSignature
SET
tblitem.strFileProcesstype = [tblFileSignature].[STRFILEPROCESSTYPE], tblitem.strFileSignatureType = [tblFileSignature].[strfilesignaturetype]
WHERE
(((tblitem.strFileSignatureType) Is Null) AND
((tblitem.strFileExclude)="n") AND
((InStr([tblitem].[strfilesignature],[tblFileSignature].[strsignature]))=1) AND ((tblitem.uidItemType)=1 Or (tblitem.uidItemType)=5) AND
((tblitem.uidCollection)=[forms]![frmSetup]![txtInputCol]) AND ((tblitem.strFileSignature) Not Like "d0c*") AND
((tblFileSignature.strFileProcessType) Not Like "ZIP"));
in tsql.. would this be the same?
update tblItem
set
i.strFileProcesstype = f.strFileProcesstype,
i.strFileSignatureType = f.strfilesignaturetype
from tblItem as I UNION tblFileSignature as F
WHERE (((i.strFileSignatureType) Is Null) AND
((i.strFileExclude)="n") AND
((i.[strfilesignature] like F.strsignature)) AND
((i.uidItemType)=1 Or
(i.uidItemType)=5) AND
((i.uidCollection)=#inputcolumn AND
((i.strFileSignature) Not Like 'd0c%') AND
((F.strFileProcessType) Not Like 'ZIP'));
thanks in advance
UPDATE:
so i'm going with the following. if i uncomment the declare and select clause and just execute from the declare down, it runs, if i comment the declare and select parts, it says error near ';'.
UPDATE I
SET
I.strFileProcesstype = F.STRFILEPROCESSTYPE,
I.strFileSignatureType = F.strfilesignaturetype
--declare #uidcollectionID int
--select I.strFileSignatureType
from
tblItem I
inner join tblFileSignature F
on
I.strfilesignature = left(F.strsignature,len(I.strfilesignature))
WHERE I.strFileSignatureType Is Null
AND I.strFileExclude='n'
AND I.uidItemType in (1,5)
AND I.uidCollection = #uidCollectionID
AND left(I.strFileSignature,3) <> 'd0c'
AND F.strFileProcessType <> 'ZIP';
any ideas?
You should change the
Double Quotes to Single Quotes
* to %
Replace the InStr with LIKE
Other than that, it looks fine to me.
No, you'd use a JOIN, not a UNION.
You can either make it a CROSS JOIN, and continue to apply the join conditions in the WHERE clause, or you can make it an inner join:
from tblItem as I INNER JOIN tblFileSignature as F
ON ((InStr(i.[strfilesignature],F.[strsignature]))=1)
And remove that condition from the WHERE clause (Lieven's answer also applies).
This should be close to what you need. May need to work on the join condition, but I think my conversion from INSTR will do it.
UPDATE i
SET strFileProcesstype = fs.STRFILEPROCESSTYPE,
strFileSignatureType = fs.strfilesignaturetype
FROM tblitem i
INNER JOIN tblFileSignature fs
ON i.strfilesignature = LEFT(fs.strsignature, LEN(i.strfilesignature))
WHERE i.strFileSignatureType IS Null
AND i.strFileExclude='n'
AND i.uidItemType IN (1,5)
AND i.uidCollection = #inputcolumn
AND LEFT(i.strFileSignature,3) <> 'd0c'
AND fs.strFileProcessType <> 'ZIP';

T-SQL Delete command basing on table variable

I need to delete some rows from table where indexes are equal indexes in table variable
declare #m_table as table
(
number NUMERIC(18,0)
)
...
inserting some rows into #m_table
...
DELETE ct FROM [dbo].[customer_task] ct
inner join project_customer pc on pc.id_customer = #m_table.number
inner join customer_user cu on cu.id_project_customer = pc.id
WHERE ct.id_csr_user = cu.id AND ct.id_status = 1;
but this code generates an error: Must declare the scalar variable "#m_table" How to solve that ?
You probably have a 'GO' (a batch separator) in those '...'
Variable declarations do not span batches.
The error means that SQL is expecting you to treat #m_table like a standard table, rather than a scalar (int, bit, etc.) variable. Perhaps something like this will work?
DELETE ct FROM [dbo].[customer_task] ct
WHERE ct.id_csr_user IN (
SELECT cu.id FROM customer_user cu
INNER JOIN project_customer pc ON pc.id = cu.id_project_customer
WHERE pc.id_customer IN (SELECT number FROM #m_table.number)
) AND ct.id_status = 1;