I have a table Studies that I perform a SELECT on.
I then need to perform a further SELECT on the recordset returned. I've tried this (simplified for clarity):
SELECT * FROM Studies
WHERE Id = '2' OR Id = '3' OR Id = '7';
SELECT * FROM Studies
WHERE (Name = 'Test')
AND Id IN (SELECT * FROM Studies WHERE Id = '2' OR Id = '3' OR Id = '7');
But I keep getting the following SQL error:
Only a single result allowed for a SELECT that is part of an expression
Where am I going wrong? If it's not evident from my code - I am relatively new to database programming.
Thanks
You can't return more than one column in a IN (...) subquery. You have to change the * (return all columns) to ID. But your query does not need a subquery, You can just add the ID's to the first query. You usually want to avoid subqueries where you can because of performance reasons.
SELECT *
FROM Studies
WHERE Name = 'Test'
AND ID IN ('2', '3','7')
Or if you want to keep your structure:
SELECT *
FROM Studies
WHERE (Name = 'Test')
AND ID IN (SELECT ID FROM Studies WHERE ID = '2' OR ID = '3' OR ID = '7');
SELECT * FROM Studies WHERE (Name = 'Test') AND ID IN (SELECT ID FROM Studies WHERE ID = '2' OR ID = '3' OR ID = '7');
Related
I need Only one unique result from tableB.Field to tableA.Field
I am using sdo operator sdo_nn, this is the code:
UPDATE table1 t1
SET t1.fieldA = (SELECT T2.fieldB,SDO_NN_DISTANCE(1) distance
FROM table1 T1, table2 T2
WHERE
(sdo_nn(t1.geometry,t2.geometry,'SDO_NUM_RES=1',1)= 'TRUE')
ORDER BY DIST
)
WHERE EXISTS(
SELECT 1
FROM table2 t2
WHERE sdo_nn(t1.geometry, t2.geometry,'SDO_NUM_RES=1',1)='TRUE'
AND(t2.cell_name = 'string1' or t2.cell_name = string2')AND t1.fieldA = NULL
);
In the select sentence of the subquery i get an error because i only use one field(t1.fieldA), but in the sentence i use the operator SDO_NN_DISTANCE(1) and the sql developer count this operator like another field. What is the correct way to write this sentence? I only use sql because i need to insert this code in vba
Thanks!!!
Obviously, you can't (simplified)
set t1.fieldA = (t2.fieldB, distance) --> you want to put two values into a single column
Therefore, get fieldB alone from the subquery which uses analytic function (row_number) to "sort" rows by sdo_nn_distance(1) desc; then get the first row's fieldB value.
Something like this (I hope I set the parenthesis right):
UPDATE table1 t1
SET t1.fieldA =
(SELECT x.fieldB --> only fieldB
FROM (SELECT T2.fieldB, --> from your subquery
SDO_NN_DISTANCE (1) distance,
ROW_NUMBER ()
OVER (ORDER BY sdo_nn_distance (1) DESC) rn
FROM table1 T1, table2 T2
WHERE (sdo_nn (t1.geometry,
t2.geometry,
'SDO_NUM_RES=1',
1) = 'TRUE')) x
WHERE rn = 1) --> where RN = 1
WHERE EXISTS
(SELECT 1
FROM table2 t2
WHERE sdo_nn (t1.geometry,
t2.geometry,
'SDO_NUM_RES=1',
1) = 'TRUE'
AND ( t2.cell_name = 'string1'
OR t2.cell_name = 'string2')
AND t1.fieldA IS NULL);
I'm trying to replace a placeholder string inside a selection of 10 random records with a random string (a name) taken from another table, using only sqlite statements.
i've done a subquery in order to replace() of the placeholder with the results of a subquery. I thought that each subquery loaded a random name from the names table, but i've found that it's not the case and each placeholder is replaced with the same string.
select id, (replace (snippet, "%NAME%", (select
name from names
where gender = "male"
) )
) as snippet
from imagedata
where timestamp is not NULL
order by random()
limit 10
I was expecting for each row of the SELECT to have different random replacement every time the subquery is invoked.
hello i'm %NAME% and this is my house
This is the car of %NAME%, let me know what you think
instead each row has the same kind of replacement:
hello i'm david and this is my house
This is the car of david, let me know what you think
and so on...
I'm not sure it can be done inside sqlite or if i have to do it in php over two different database queries.
Thanks in advance!
Seems that random() in the subquery is only evaluated once.
Try this:
select
i.id,
replace(i.snippet, '%NAME%', n.name) snippet
from (
select
id,
snippet,
abs(random()) % (select count(*) from names where gender = 'male') + 1 num
from imagedata
where timestamp is not NULL
order by random() limit 10
) i inner join (
select
n.name,
(select count(*) from names where name < n.name and gender = 'male') + 1 num
from names n
where gender = 'male'
) n on n.num = i.num
I have two tables Procedures and ProcedureTypes.
Procedures has a column Type which is a varchar with the values (1, 2), (3, 4), (4, 5) etc...
ProcedureType has a primary key 'ID' 1 to 9.
ID Description
1 Drug
2 Other-Drug
etc...
ID is an integer value and Type is varchar value.
Now I need to join these two tables to show the values
ID in the Procedures table
ProcedureType in the Procedures table
Description in the ProceduresType table with the value separated by a "-".
For example if he value in Type is (1,2) the new table after join should show values in the description like (Drug-Other Drug)
I have used this query bot to no avail
SELECT * FROM dbo.[Split]((select RequestType from GPsProcedures), ',')
Can anyone tell me how to do it and why the above query is not working
with Procedures as (
select 1 as ID, '1,2,3' as Typ
),
ProcedureTypes as (
select 1 as TypeID, 'Drug' as Name
union select 2 , 'Other-Drug'
union select 3 , 'Test 3'
)
/*Get one extra column of type xml*/
,Procedures_xml as (
select id,CONVERT(xml,' <root> <s>' + REPLACE(Typ,',','</s> <s>') + '</s> </root> ') as Typ_xml
from Procedures
)
/*Convert the field string to multiple rows then join to procedure types*/
, Procdure_With_Type as (
select ID,T.c.value('.','varchar(20)') as TypeID,
ProcedureTypes.Name
from Procedures_xml
CROSS APPLY Typ_xml.nodes('/root/s') T(c)
INNER JOIN ProcedureTypes ON T.c.value('.','varchar(20)') = ProcedureTypes.TypeID
)
/*Finally, group the procedures type names by procedure id*/
select id,
STUFF((
SELECT ', ' + [Name]
FROM Procdure_With_Type inn
WHERE (Procdure_With_Type.ID = inn.ID)
FOR XML PATH(''),TYPE).value('(./text())[1]','VARCHAR(MAX)')
,1,2,'') AS NameValues
from Procdure_With_Type
group by ID
You can't have a select statement as a parameter for a function, so instead of this:
SELECT * FROM dbo.[Split]((select RequestType from GPsProcedures), ',')
Use this:
select S.*
from GPsProcedures P
cross apply dbo.[Split](P.RequestType, ',') S
I want to add data to table STATISTICS using INSERT statements.
I also want to move new counts to old counts and new date to old date as the new data comes in.
This is where it gets lil tricky because I don't know if there is such a thing as INSERT INTO table with SET in Oracle.
INSERT INTO STATISTICS
SET
MODEL = '&MY_MODEL',
NEW_COUNT =
(
SELECT COUNT(*)
FROM TABLE CLIENTS
),
NEW_DATE = SYSDATE,
OLD_COUNT = NEW_COUNT,
OLD_DATE = NEW_DATE,
PRNCT_CHANGE = ((NEW_COUNT) - (OLD_COUNT)) / (NEW_COUNT)*100
);
How do I accomplish this in Oracle?
This should upsert statistics, adding new ones as you go. It presumes a unique key on MODEL; if that's not true, then you'd have to do inserts as Angelina said, getting only the most recent row for a single MODEL entry.
MERGE INTO STATISTICS tgt
using (SELECT '&MY_MODEL' AS MODEL,
(SELECT COUNT(*) FROM CLIENTS) AS NEW_COUNT,
SYSDATE AS DATE_COUNT,
NULL AS OLD_COUNT,
NULL OLD_DATE,
NULL AS PRCNT_CHANGE
FROM DUAL) src
on (TGT.MODEL = SRC.MODEL)
WHEN MATCHED THEN UPDATE
SET TGT.NEW_COUNT = SRC.NEW_COUNT,
TGT.NEW_DATE = SRC.NEW_DATE,
TGT.OLD_COUNT = TGT.NEW_COUNT,
TGT.OLD_DATE = TGT.NEW_DATE,
TGT.PRCNT_CHG = 100 * (SRC.NEW_COUNT - TGT.NEW_COUNT) / (SRC.NEW_COUNT)
-- NEEDS DIV0/NULL CHECKING
WHEN NOT MATCHED THEN INSERT
(MODEL, NEW_COUNT, NEWDATE, OLD_COUNT, OLD_DATE, PRCNT_CHANGE)
VALUES
(src.MODEL, src.NEW_COUNT, src.NEWDATE, src.OLD_COUNT, src.OLD_DATE, src.PRCNT_CHANGE);
INSERT INTO STATISTICS(MODEL,NEW_COUNT,NEW_DATE,OLD_COUNT,OLD_DATE,PRNCT_CHANGE)
SELECT MODEL,
( SELECT COUNT(*)
FROM TABLE(USERS)
),
SYSDATE,
NEW_COUNT,
NEW_DATE,
(((NEW_COUNT) - (OLD_COUNT)) / (NEW_COUNT)*100)
FROM SEMANTIC.COUNT_STATISTICS
WHERE MODEL = '&MY_MODEL'
AND trunc(NEW_DATE) = trunc(NEW_DATE -1)
;
I need to select data from four tables based on only one.
In my 'calculated' table, I have all the records I need.
But I need to retrieve some other info for each record, from 'programs', 'term' and 'imported' tables.
'calculated' has ID from 'programs'.
But, to achieve a record from 'imported', I need to join the 'item' table, because 'item' has ID from 'programs' and from 'imported'.
'term' has ID from 'imported'.
So, I tried this:
select c.date,
p.name,
c.name1,
c.name2,
t.date,
i.version,
c.price1,
c.price2,
c.price3
from calculated c, programs p, term t, imported i, item it
where c.programs_id = p.programs_id
and c.programs_id = it.programs_id
and it.imported_id = i.imported_id
and i.term_id = t.term_id;
But when I use count(*) on 'calculated', I get 30k of records, and from my select statement I get more than 130 millions of records.
What am I doing wrong?
What should I do for this to work?
If all duplicates rows are equivalent, u can try smth like this
select c.date,
p.name,
c.name1,
c.name2,
t.date,
i.version,
c.price1,
c.price2,
c.price3
from calculated c, programs p, term t, imported i
where c.programs_id = p.programs_id and
(select imported_id from item it where c.programs_id = it.programs_id and rownum = 1) = i.imported_id
and i.term_id = t.term_id;
where "rownum = 1" is restriction on the selection of one line for oracle.
you forgot to join term table.
Probably you need to add
and t.term_id = i.term_id