Say I'm trying to return some results where a column in a table matches a condition I set. But I only want to return the first result from a list of possible values in the condition. Is there a quick and easy way to do that? I'm thinking that I can use coalesce somehow, but not sure how I can structure it.
Something like:
select identifier,purpose from table
where identifier = 'letters'
and purpose = coalesce('A','B','C')
group by purpose
So in the table, if A purpose isn't there, then I only want the B purpose to show up. if it isn't there, then I want the C to show up, if none of them are there, then I would ideally like a null or no results to be returned. I'd rather not make several case statements where if A is null then look to B, then if B is null to look to C. Is there a quick way syntactically to do so?
Edit: I also want this to work if I have multiple identifiers I list, such as:
select identifier,purpose from table
where identifier in ('letters1', 'letters2')
and purpose = coalesce('A','B','C')
group by purpose
where I return two results if they exist - one purpose for each identifier, with the purpose in the order of importance for A first, then B, then C, or null if none exist.
Unforunately my reasoning for caolesce doesn't work above, as none of the variables are null so my query will just try to return all purposes of 'A' without the fallback that I intend my query to do. I want to try and avoid using temp tables if possible.
Sybase ASE does not have support for the row_number() function (else this would be fairly simple), so one option would be to use a #temp table to simulate (to some extent) row_number() functionality.
Some sample data:
create table mytab
(identifier varchar(30)
,purpose varchar(30)
)
go
insert mytab values ('letters1','A')
insert mytab values ('letters1','B')
insert mytab values ('letters1','C')
insert mytab values ('letters2','A')
insert mytab values ('letters2','B')
insert mytab values ('letters2','C')
go
The #temp table is created with an identity column plus a 2nd column to hold the items you wish to prioritize; priority is determined by the order in which the rows are inserted into the #temp table.
create table #priority
(id smallint identity
,purpose varchar(30))
go
insert #priority (purpose)
select 'A' -- first priority
union all
select 'B' -- second priority
union all
select 'C' -- last priority
go
select * from #priority order by id
go
id purpose
------ -------
1 A
2 B
3 C
We'll use a derived table to find the highest priority purpose (ie, minimal id value). We then join this minimal id back to #priority to generate the final result set:
select dt.identifier,
p.purpose
from (-- join mytab with #priority, keeping only the minimal priority id of the rows that exist:
select m.identifier,
min(p.id) as min_id
from mytab m
join #priority p
on p.purpose = m.purpose
group by m.identifier) dt
-- join back to #priority to convert min(id) into the actual purpose:
join #priority p
on p.id = dt.min_id
order by 1
go
Some test runs with different set of mytab data:
/* contents of mytab:
insert mytab values ('letters1','A')
insert mytab values ('letters1','B')
insert mytab values ('letters1','C')
insert mytab values ('letters2','A')
insert mytab values ('letters2','B')
insert mytab values ('letters2','C')
*/
identifier purpose
---------- -------
letters1 A
letters2 A
/* contents of mytab:
--insert mytab values ('letters1','A')
--insert mytab values ('letters1','B')
insert mytab values ('letters1','C')
--insert mytab values ('letters2','A')
insert mytab values ('letters2','B')
insert mytab values ('letters2','C')
*/
identifier purpose
---------- -------
letters1 C
letters2 B
Returning NULL if a row does not exist is not going to be easy since generating a NULL requires existence of a row ... somewhere ... with which to associate the NULL.
One idea would be to expand on the #temp table idea by creating another #temp table (eg, #identifiers) with the list of desired identifier values you wish to search on. You could then make use of a left (outer) join from #identifiers to mytab to ensure you always generate a result record for each identifier.
I have a table with a xml column.
I require to search for sub string in that xml column for all its node and value. Search should be case insensitive
Structure of XML in each row is different
I used below query to do that,
select * from TableName Where Cast(xmlcolumn as varchar(max) ) like '%searchString%'
this works for short length xml rows, if row length goes huge it cant handle the situation. Only partial of the data was searched.
Suggest me some other ways to achieve.
If this is one time task then I would use exist XML method thus:
DECLARE #Table1 TABLE (
ID INT IDENTITY PRIMARY KEY,
CommentAsXML XML
)
INSERT #Table1 (CommentAsXML)
VALUES (N'<root><item /><item type="Reg">0001</item><item type="Inv">B007</item><item type="Cus">A0001</item><item type="Br">F0001</item></root>')
INSERT #Table1 (CommentAsXML)
VALUES (N'<root><item /><item type="Reg">0005</item><parent><child>B007</child></parent><item type="Br">F0005</item></root>')
INSERT #Table1 (CommentAsXML)
VALUES (N'<root><item /><item type="Reg">0005</item></root>')
-- Following query is searching for B007 within InnerText of all XML elements:
SELECT *
FROM #Table1 t
WHERE t.CommentAsXML.exist('//*[lower-case(text()[1]) eq "b007"]') = 1
Results:
ID CommentAsXML
-- ------------------------------------------------------------------------------------------------------------------------------
1 <root><item type="Reg">0001</item><item type="Inv">B007</item><item type="Cus">A0001</item><item type="Br">F0001</item></root>
2 <root><item type="Reg">0005</item><parent><child>B007</child></parent><item type="Br">F0005</item></root>
Also, if you want to search for some text in XML atrributes' values then following XQuery could be used:
SELECT *
FROM #Table1 t
WHERE t.CommentAsXML.exist('//#*[lower-case(.) eq "reg"]') = 1
Note: in both cases, string constants (ex. "reg") should be with lower cases.
Hi I have the following xml input in a SP.
DECLARE #XmlVariable XML = '<portal><patientid>67518</patientid>
<forms>
<form id="31" type="C"/>
<form id="44" type="D"/>
</forms>
</portal>'
I have the following inmemory table:
DECLARE #TColumns table (
FormId int,
FormType varchar(1),
PatientId int
)
Now, my intention is to:
1.Iterate the xml and insert the values into the #TColumns table.
2.Read the #TColumns table row by row and based on the 3 column values update some existing table;something like
update myexistingtable set status=4 where Formid=31 && Formtype='C' and PatientId=67518.
For item number 1 above, this is what I have done till now, but there is some syntax error:
INSERT INTO #TColumns(FormId,FormType,PatientId)
SELECT
XTbl.Cats.value('.', 'int'),
XTbl.Cats.value('.', 'varchar(1)'),
XTbl.Cats.value('.', 'int')
FROM
#XmlVariable.nodes('/portal/forms/form/#id') AS XTbl(Cats),
#XmlVariable.nodes('/portal/forms/form/#type') AS XTbl(Cats),
#XmlVariable.nodes('/portal/forms/form/#patientid') AS XTbl(Cats)
The error I am getting is:The correlation name 'XTbl' is specified multiple times in a FROM clause.
Need help on this and also on the item number 2 above.
Thanks in advance.
Maybe you want something like this
SELECT
Tbl1.Form.value('#id', 'int'),
Tbl1.Form.value('#type', 'varchar(1)'),
Tbl2.Portal.value('patientid', 'int')
FROM
#XmlVariable.nodes('//form') Tbl1(Form),
#XmlVariable.nodes('//portal') Tbl2(Portal)
This is what helped.Yes its is based on Hogan's last suggestion.Thank you!
INSERT INTO #TColumns(FormId,FormType,PatientId)
SELECT
Tbl1.Form.value('#id', 'int'),
Tbl1.Form.value('#type', 'varchar(1)'),
Tbl2.Portal.value('.', 'int')
FROM
#XmlVariable.nodes('//form') Tbl1(Form),
#XmlVariable.nodes('//patientid') Tbl2(Portal)
I'm using MERGE in my query and i'm making INSERT on clause WHEN NOT MATCHED THEN, but then i would like to get the inserted row identity and make another INSERT to some other table. Query for now is:
ALTER PROCEDURE [dbo].[BulkMergeOffers]
#data ImportDataType READONLY
AS
SET NOCOUNT ON;
DECLARE #cid int = 0
MERGE dbo.oferta AS target
USING #data AS source
ON (target.nr_oferty = source.nr_oferty)
WHEN NOT MATCHED THEN
INSERT (nr_oferty,rynek,typ_transakcji, typ_nieruchomosci,cena,powierzchnia, rok_budowy, wojewodztwo, miasto, dzielnica, ulica, opis, wspolrzedne, film, zrodlo, KontaktStore, data, forma_wlasnosci, stan_techniczny, liczba_pokoi, liczba_peter, pietro, material, kuchnia, pow_dzialki, typ_dzialki, woda,gaz, prad,sila, przeznaczenie,lokal_dane)
VALUES (source.nr_oferty,source.rynek,source.typ_transakcji, source.typ_nieruchomosci,source.cena,source.powierzchnia, source.rok_budowy, source.wojewodztwo, miasto, source.dzielnica, source.ulica, source.opis, source.wspolrzedne, source.film, source.zrodlo, source.KontaktStore, source.data, source.forma_wlasnosci, source.stan_techniczny, source.liczba_pokoi, source.liczba_peter, source.pietro, source.material, source.kuchnia, source.pow_dzialki, source.typ_dzialki, source.woda,source.gaz, source.prad,source.sila, source.przeznaczenie,source.lokal_dane);
So as you see i need to insert some values to the target table based on source data, then i need to take the insert identity and insert it into another table but also based on some source data, so something like that, just after the first insert:
SET #cid = SCOPE_IDENTITY();
if source.photo is not null
begin
insert into dbo.photos(offerID, file) values (#cid, source.photo);
end
But i can't assemble it, a have no access to the source no more, also if statement show error :
"the multi-part identifier
source.photo can not be bound"
but it is there. Just for clarity ImportDataType is a table-valued parameter.
Please HELP
If you don't need the WHEN MATCHED part of the MERGE statement in your query, there's no real reason to use MERGE. You could use INSERT with an outer join or NOT EXISTS statement.
In either case, you can use the OUTPUT clause to retrieve the inserted identity value an pass it on to a second query.
I've extended your example:
<stored procedure header - unchanged>
--declare a table variable to hold the inserted values data
DECLARE #newData TABLE
(nr_oferty int
,newid int
) -- I'm guessing the datatype for both columns
MERGE dbo.oferta AS target
USING #data AS source
ON (target.nr_oferty = source.nr_oferty)
WHEN NOT MATCHED THEN
INSERT (nr_oferty,rynek,typ_transakcji, typ_nieruchomosci,cena,powierzchnia, rok_budowy, wojewodztwo, miasto, dzielnica, ulica, opis, wspolrzedne, film, zrodlo, KontaktStore, data, forma_wlasnosci, stan_techniczny, liczba_pokoi, liczba_peter, pietro, material, kuchnia, pow_dzialki, typ_dzialki, woda,gaz, prad,sila, przeznaczenie,lokal_dane)
VALUES (source.nr_oferty,source.rynek,source.typ_transakcji, source.typ_nieruchomosci,source.cena,source.powierzchnia, source.rok_budowy, source.wojewodztwo, miasto, source.dzielnica, source.ulica, source.opis, source.wspolrzedne, source.film, source.zrodlo, source.KontaktStore, source.data, source.forma_wlasnosci, source.stan_techniczny, source.liczba_pokoi, source.liczba_peter, source.pietro, source.material, source.kuchnia, source.pow_dzialki, source.typ_dzialki, source.woda,source.gaz, source.prad,source.sila, source.przeznaczenie,source.lokal_dane)
OUTPUT inserted.nr_oferty, inserted.<tableId> INTO #newData;
-- replace <tableId> with the name of the identity column in dbo.oftera
insert into dbo.photos(offerID, file)
SELECT nd.newid, pt.photo
FROM #data AS pt
JOIN #newData AS nd
ON nd.nr_oferty = pt.nr_oferty
WHERE pt.photo IS NOT NULL
I have a Table with an XML column,
I want to update the xml to insert attribute or to change the attribute value if the attribute already exists.
Let's say the starting xml is: < d />
Inserting:
UPDATE Table
set XmlCol.modify('insert attribute att {"1"} into /d[1]')
Changing:
UPDATE Table
set XmlCol.modify('replace value of /d[1]/#att with "1"')
insert will fail if the attribute already exists, replace will fail if the attribute doesn't exists.
I have tried to use 'if' but I don't think it can work, there error I get: "XQuery [modify()]: Syntax error near 'attribute', expected 'else'."
IF attempt
UPDATE Table
set XmlCol.modify('if empty(/d[1]/#att)
then insert attribute att {"1"} into /d[1]
else replace value of /d[1]/#att with "1"')
Currently I select the xml into a variable and then modify it using T-SQL and then updating the column with new xml, this requires me to lock the row in a transaction and is probably more expensive for the DB.
From what I can tell, you can't do this with single statement. You can use the exist() method to accomplish that with two update statements.
DECLARE #TestTable TABLE
(
Id int,
XmlCol xml
);
INSERT INTO #TestTable (Id, XmlCol)
VALUES
(1, '<d att="1" />'),
(2, '<d />'),
(3, '<d att="3" />');
SELECT * FROM #TestTable;
UPDATE #TestTable
SET XmlCol.modify('replace value of /d[1]/#att with "1"')
WHERE XmlCol.exist('(/d[1])[not(empty(#att))]') = 1;
UPDATE #TestTable
SET XmlCol.modify('insert attribute att {"1"} into /d[1]')
WHERE XmlCol.exist('(/d[1])[empty(#att)]') = 1;
SELECT * FROM #TestTable;
The output from the final select is:
Id XmlCol
----------- -------------------
1 <d att="1" />
2 <d att="1" />
3 <d att="1" />
There is a slightly better way than Tommys:
DECLARE #TestTable TABLE
(
Id int,
XmlCol xml
);
INSERT INTO #TestTable (Id, XmlCol)
VALUES
(1, '<UserSettings> </UserSettings>'),
(2, '<UserSettings><timeout>3</timeout> </UserSettings>'),
(3, '<UserSettings> </UserSettings>');
UPDATE #TestTable
SET XmlCol.modify('replace value of (/UserSettings/timeout/text())[1] with "1"')
WHERE Id = 3 and XmlCol.exist('/UserSettings/timeout') = 1;
IF ##ROWCOUNT=0
UPDATE #TestTable
SET XmlCol.modify('insert <timeout>5</timeout> into (/UserSettings)[1] ')
WHERE Id = 3;
SELECT * FROM #TestTable;
The solution is a combination of Tommys and simple SQL and required only 1 SQL UPDATE if the column exist. Tommys always recuire two updates.