Looking for results of all rows for those eventIds where there exists a row for that eventId with a particular position and sub position, but there does NOT EXIST any row with that position and a null subposition. I did it in MS SQL using the EXCEPT keyword; however, MS Access fails on EXCEPT. Is there a way to do this query in MS Access:
SELECT Distinct eventID FROM table WHERE Position = '123' AND SubPosition = 'ABC'
AND pool = 'something'
AND Status = 'active'
AND area = '1'
EXCEPT
SELECT Distinct eventID FROM table WHERE Position = '123' AND SubPosition IS NULL
AND pool = 'something'
AND Status = 'active'
AND area = '1'
Thanks
Something along the lines of an outer join to find where there's no null match and then filter on there being no null match.
SELECT *
FROM (select * from Table1 where subposition is not null) as hasSubPosition
left join (select * from Table1 where subposition is null) AS noSubPosition
on
hasSubPosition.eventid = noSubPosition.eventid and
hasSubPosition.position = noSubPosition.position and
hasSubPosition.pool = noSubPosition.pool and
hasSubPosition.status = noSubPosition.status and
hasSubPosition.area = noSubPosition.area
where noSubPosition.eventid is null
Related
I have tables:
Result containing 5 columns: result_id, num_1, num_2, num_3, num_4
Ref containing 4 columns: num_1, num_2, num_3, num_4
Columns num contain random int in range of 1-9
Aim of exercise is to display all result_id from Result table which have num values combination present in Ref table and to display result_id which have not met combination criteria.
I've been trying left joining ref to result, but unfortunately no success. Could you please share some light how to deal with it?
If you want the result_id for which combination exists in the ref table then use following JOIN query:
select distinct r.result_id
from results r
join ref on r.num_1 = ref.num_1 and r.num_2 = ref.num_2
and r.num_3 = ref.num_3 and r.num_4 = ref.num_4
If you want the result_id for which combination do not exists in REF table then use the LEFT JOIN as follows:
select r.result_id
from results r
left join ref on r.num_1 = ref.num_1 and r.num_2 = ref.num_2
and r.num_3 = ref.num_3 and r.num_4 = ref.num_4
where ref.num_1 is null -- or use PK / Not nullable column of REF table here
Assuming you want the columns to "line up" and you want to add a flag to the result_id in the first table, then use exists:
select t1.*,
(case when exists (select 1
from table2 t2
where t2.n1 = t1.n1 and t2.n2 = t1.n2 and t2.n3 = t1.n3 and t2.n4
)
then 'present' else 'not present'
end) as flag
from t2;
I am working on Postgres and I have two tables vehicles and vehicles_flag. There are no relations between the two tables and hence we can not join two tables to fetch the required data.
The table structure is below (vehicle_flag table may not contain all the id present in the vehicle table) :
[Table structure]
I am writing a function that will accept multiple input parameters. I have to select vehicle id from the vehicle_flag table only if the flag value is true: otherwise, I have to ignore the vehicel_flag table. My aim is to achieve something like this, but turns out the case statement expects scaler output:
select count(id) from vehicles
where
vehicles.id in (case
when #hasbluetooth =1 then (select distinct id from vehicle_flags where flag='bluetooth' and value = '1')
else
(select distinct id from vehicles)
end)
and
vehicles.id in (case
when #hasac =1 then (select distinct id from vehicle_flags where flag='ac' and value = '1')
else
(select distinct id from vehicles)
end)
Kindly suggest any solution to achieve this.
I suspect you want:
select v.*
from vehicle v
left join vehicle_flags vf on vf.id = v.id
group by v.id
having
(#hasbluetooth = 0 or bool_or(vf.flag = 'bluetooth' and vf.value = 1)
and (#hasac = 0 or bool_or(vf.flag = 'ac' and vf.value = 1)
I am using MS SQL. I want to update a specific row within a table with data from another table. I have created a query that will get the specific row I want to update. Please note that I have used a select query to select the specific row that needs to be updated. Also note that there is a sub query used to get the right row. For me, this makes it difficult to incorporate into a set statement.
select tbl1.assessmentcode, tbl1.Overview from subjectassessmentareas tbl1
inner join
(
select assessmentcode,MIN(areaseq) as minassessarea from subjectassessmentareas
where resultgroup = 'PR_Yr8_2' and ResultType = 'KUS_5'
group by AssessmentCode
) tbl2
on tbl1.AssessmentCode = tbl2.AssessmentCode and tbl1.AreaSeq = tbl2.minassessarea
where fileyear = 2016 and filesemester = 3
This gives me
Now I want to update the overview column with data from another table. This select query gives me the info I want to use to update the other table.
SELECT AssessmentCode, Overview
FROM SubjectAssessments
WHERE (ClassCampus = 'S')
and (FileYear = 2015)
and (FileSemester = 3)
and filetype = 'A'
and AssessmentCode like '08%'
This gives me
Can someone please help me with the syntax to update the overview column from the row obtained in the first query above with the overview column contained in the second query where the Query1.AssessmentCode = Query2.AssessmentCode from both queries.
How can I use a set statement but then use the first query above to say which row to set? Other similar questions just use a simple set and then a field without any where statements.
Just join these two in an updateable CTE:
;with x as (
select tbl1.assessmentcode, tbl1.Overview
from subjectassessmentareas tbl1
inner join
(
select assessmentcode,MIN(areaseq) as minassessarea from subjectassessmentareas
where resultgroup = 'PR_Yr8_2' and ResultType = 'KUS_5'
group by AssessmentCode
) tbl2
on tbl1.AssessmentCode = tbl2.AssessmentCode and tbl1.AreaSeq = tbl2.minassessarea
where fileyear = 2016 and filesemester = 3
),
y as (
SELECT AssessmentCode, Overview
FROM SubjectAssessments
WHERE (ClassCampus = 'S')
and (FileYear = 2015)
and (FileSemester = 3)
and filetype = 'A'
and AssessmentCode like '08%'
),
z as (
select x.Overview as dest, y.Overview as src
from x join y on x.AssessmentCode = y.AssessmentCode
)
update z set dest = src
Try following:
;WITH cteBaseInfo AS
(
SELECT AssessmentCode, Overview
FROM SubjectAssessments
WHERE (ClassCampus = 'S')
and (FileYear = 2015)
and (FileSemester = 3)
and filetype = 'A'
and AssessmentCode like '08%'
)
, cteToBeUpdated AS
(
select tbl1.assessmentcode, tbl1.Overview from subjectassessmentareas tbl1
inner join
(
select assessmentcode,MIN(areaseq) as minassessarea from subjectassessmentareas
where resultgroup = 'PR_Yr8_2' and ResultType = 'KUS_5'
group by AssessmentCode
) tbl2
on tbl1.AssessmentCode = tbl2.AssessmentCode and tbl1.AreaSeq = tbl2.minassessarea
where fileyear = 2016 and filesemester = 3.
)
UPDATE subjectassessmentareas
SET Overview = (SELECT Overview FROM cteBaseInfo WHERE AssessmentCode = subjectassessmentareas.AssessmentCode)
WHERE AssessmentCode IN (SELECT AssessmentCode FROM cteToBeUpdated)
Please note that, here AssessmentCode should be Primary Key.
I am using the below query to update one column based on the conditions it is specified. I am using "inner join" but it is taking more than 15 seconds to run the query even if it has to update no records(0 records).
UPDATE CONFIGURATION_LIST
SET DUPLICATE_SERIAL_NUM = 0
FROM CONFIGURATION_LIST
INNER JOIN (SELECT DISTINCT APPLIED_MAT_CODE, APPLIED_SERIAL_NUMBER, COUNT(*) AS NB
FROM CONFIGURATION_LIST
WHERE
PLANT = '0067'
AND APPLIED_SERIAL_NUMBER IS NOT NULL
AND APPLIED_SERIAL_NUMBER !=''
AND DUPLICATE_SERIAL_NUM = 1
GROUP BY
APPLIED_MAT_CODE, APPLIED_SERIAL_NUMBER
HAVING
COUNT(*) = 1) T2 ON T2.APPLIED_SERIAL_NUMBER = CONFIGURATION_LIST.APPLIED_SERIAL_NUMBER
AND T2.APPLIED_MAT_CODE = CONFIGURATION_LIST.APPLIED_MAT_CODE
WHERE
CONFIGURATION_LIST.PLANT = '0067'
AND DUPLICATE_SERIAL_NUM = 1
The index is there with APPLIED_SERIAL_NUMBER and APPLIED_MAT_CODE and fragmentation is also fine.
Could you please help me on the above query performance.
First, you don't need the DISTINCT when using GROUP BY. SQL Server probably ignores it, but it is a bad idea anyway:
UPDATE CONFIGURATION_LIST
SET DUPLICATE_SERIAL_NUM = 0
FROM CONFIGURATION_LIST INNER JOIN
(SELECT APPLIED_MAT_CODE, APPLIED_SERIAL_NUMBER, COUNT(*) AS NB
FROM CONFIGURATION_LIST cl
WHERE cl.PLANT = '0067' AND
cl.APPLIED_SERIAL_NUMBER IS NOT NULL AND
cl.APPLIED_SERIAL_NUMBER <> ''
cl.DUPLICATE_SERIAL_NUM = 1
GROUP BY cl.APPLIED_MAT_CODE, cl.APPLIED_SERIAL_NUMBER
HAVING COUNT(*) = 1
) T2
ON T2.APPLIED_SERIAL_NUMBER = CONFIGURATION_LIST.APPLIED_SERIAL_NUMBER AND
T2.APPLIED_MAT_CODE = CONFIGURATION_LIST.APPLIED_MAT_CODE
WHERE CONFIGURATION_LIST.PLANT = '0067' AND
DUPLICATE_SERIAL_NUM = 1;
For this query, you want the following index: CONFIGURATION_LIST(PLANT, DUPLICATE_SERIAL_NUM, APPLIED_SERIAL_NUMBER, APPLIED_MAT_CODE, APPLIED_SERIAL_NUMBER).
The HAVING COUNT(*) = 1 suggests that you might really want NOT EXISTS (which would normally be faster). But you don't really explain what the query is supposed to be doing, you only say that this code is slow.
Looks like you're checking the table for rows that exist in the same table with the same values, and if not, update the duplicate column to zero. If your table has a unique key (identity field or composite key), you could do something like this:
UPDATE C
SET C.DUPLICATE_SERIAL_NUM = 0
FROM
CONFIGURATION_LIST C
where
not exists (
select
1
FROM
CONFIGURATION_LIST C2
where
C2.APPLIED_SERIAL_NUMBER = C.APPLIED_SERIAL_NUMBER and
C2.APPLIED_MAT_CODE = C.APPLIED_MAT_CODE and
C2.UNIQUE_KEY_HERE != C.UNIQUE_KEY_HERE
) and
C.PLANT = '0067' and
C.DUPLICATE_SERIAL_NUM = 1
I will try with a select first:
select APPLIED_MAT_CODE, APPLIED_SERIAL_NUMBER, count(*) as n
from CONFIGURATION_LIST cl
where
cl.PLANT='0067' and
cl.APPLIED_SERIAL_NUMBER IS NOT NULL and
cl.APPLIED_SERIAL_NUMBER <> ''
group by APPLIED_MAT_CODE, APPLIED_SERIAL_NUMBER;
How many rows do you get with this and how long does it take?
If you remove your DUPLICATE_SERIAL_NUM column from your table it might be very simple. The DUPLICATE_SERIAL_NUM suggests that you are searching for duplicates. As you count your rows you could introduce a simple table that contains the counts:
create table CLCOUNT ( N int unsigned, C int /* or what APPLIED_MAT_CODE is */, S int /* or what APPLIED_SERIAL_NUMBER is */, PLANT char(20) /* or what PLANT is */, index unique (C,S,PLANT), index(PLANT,N));
insert into CLCOUNT select count(*), cl.APPLIED_MAT_CODE, cl.APPLIED_SERIAL_NUMBER, cl.PLANT
from CONFIGURATION_LIST cl
where
cl.PLANT='0067' and
cl.APPLIED_SERIAL_NUMBER IS NOT NULL and
cl.APPLIED_SERIAL_NUMBER <> ''
group by APPLIED_MAT_CODE, APPLIED_SERIAL_NUMBER;
How long does this take?
Now you can simply select * from CLCOUNT where PLANT='0067' and N=1;
This is all far from being perfect. But you should be able to analyze (EXPLAIN SELECT ...) your queries and find why it takes so long.
I have two selects which are required to filter data. They are not complicated:
"SELECT * FROM StevesTable t WHERE "
"t.data1 = '%s' AND "
"t.data2 = to_date('%s','DD/MM/YYYY');",
strdata1,
dtDate.Format();
and
SELECT distinct data1 FROM anothertable ftt
join table1 tab on tab.somedata = ftt.somedata
where tab.somedata = 0
and tab.someotherdata = 1
I would like to combine these two as I need to filter the returned dataset from the first select statement by the returned field in the second (ie if a record returned in the first set does not have a data1 value which is contained in the second returned set it is invalid).
I tried to union and intersect the selects but you need the same number of columns returned and that cannot happen as these are completely different tables. When I tried to simply merge them together I found it difficult as the second select statement is a distinct select whereas the first is not.
I was wondering whether I had missed a trick somewhere for combining these sorts of selects?
What you need is a SQL sub-query:
SELECT * FROM StevesTable t
WHERE t.data1 = '%s'
AND t.data2 = to_date('%s','DD/MM/YYYY')
AND t.data1 in (select distinct data1 FROM anothertable ftt
join table1 tab on tab.somedata = ftt.somedata
where tab.somedata = 0
and tab.someotherdata = 1)
There, you check that all records in the first select have a data1 value in the second set.
You can do this using an EXISTS condition:
SELECT * FROM StevesTable t
WHERE t.data1 = '%s' AND
t.data2 = to_date('%s','DD/MM/YYYY') AND
EXISTS (select null
from anothertable ftt
join table1 tab on tab.somedata = ftt.somedata
where tab.somedata = 0 and
tab.someotherdata = 1 and
ftt.data1 = t.data1)