I have a table table1. with columns sn, rt and type
I want to get rows with different rt (i.e rt = 1,2,3) column conditions
(SELECT *
FROM table1
WHERE sn = 'testing' AND rt = 1 AND type = 'pump'
ORDER BY id DESC
LIMIT 1)
UNION
(SELECT *
FROM table1
WHERE sn = 'testing' AND rt = 2 AND type = 'pump'
ORDER BY id DESC
LIMIT 1)
UNION
(SELECT *
FROM table1
WHERE sn = 'testing' AND rt = 3 AND type = 'pump'
ORDER BY id DESC
LIMIT 1)
Currently i am trying the above.
Which is the effective way to get the rows
Use ROW_NUMBER() window function:
SELECT t.*
FROM (
SELECT *, ROW_NUMBER() OVER (PARTITION BY rt ORDER BY id DESC) rn
FROM table1
WHERE sn = 'testing' AND type = 'pump' AND rt IN (1, 2, 3)
) t
WHERE t.rn = 1
You can omit AND rt IN (1, 2, 3) if 1, 2 and 3 are the only possible values for rt.
You'll want to do JOINs between the table and itself, then specify the conditions in the singular WHERE clause. I've done a rough sketch of it below:
SELECT t1.*, t2.*, t3.*
FROM table1 AS t1
JOIN table1 AS t2
ON t1.sn = t2.sn AND t1.type = t2.type -- If you've got more reasonable connections between your datapoints, use them here
JOIN table1 AS t3
ON t.sn = t3.sn AND t1.type = t3.type
WHERE t1.rt = 1 AND t2.rt = 2 AND t3.rt = 3
ORDER BY t1.id DESC
LIMIT 1
Depending on what other requirements you have, you may have to tweak some parts of that. If you want results when t1 has a value but t2 or t3 doesn't you can use a LEFT JOIN instead.
Related
Lets assume we have the following table1:
1 2 3
a x m
a y m
b z m
I want to do an inner join on the table
INNER JOIN tabel2 ON table1.2 = table2.2
Somehow like this, but additional a condition that the value of table1.1 not unique. Thus on table1.1 = b no inner join will occure in this example.
What is the best way to achieve this?
Using a an aggregate in a sub query is how I would do it
SELECT *
FROM table1
JOIN table2
ON table1."2" = table2."2"
JOIN (
SELECT "1"
FROM table1
GROUP BY "1"
HAVING COUNT(*) > 1
) AS sub_q
ON sub_q."1" = table1."1";
Another option might be a cte or temporary table to hold the rows you're joining on
WITH _cte AS
(
SELECT "1"
FROM table1
GROUP BY "1"
HAVING COUNT(*) > 1
)
SELECT *
FROM table1
JOIN table2
ON table1."2" = table2."2"
JOIN _cte AS cte
ON cte."1" = table1."1";
temp table:
CREATE TEMPORARY TABLE _tab
(
"1" varchar
);
INSERT INTO _tab
SELECT "1"
FROM table1
GROUP BY "1"
HAVING COUNT(*) > 1;
SELECT *
FROM table1
JOIN table2
ON table1."2" = table2."2"
JOIN _tab AS tab
ON tab."1" = table1."1";
Below sample query is a part of my main query. I found SORT operator in below query is consuming 30% of the cost.
To avoid SORT, there is need of creation of Indexes. Is there any other way to optimize this code.
SELECT TOP 1 CONVERT( DATE, T_Date) AS T_Date
FROM TableA
WHERE ID = r.ID
AND Status = 3
AND TableA_ID >ISNULL((
SELECT TOP 1 TableA_ID
FROM TableA
WHERE ID = r.ID
AND Status <> 3
ORDER BY T_Date DESC
), 0)
ORDER BY T_Date ASC
Looks like you can use not exists rather than the sorts. I think you'll probably get a better performance boost by use a CTE or derived table instead of the a scalar subquery.
select *
from r ... left outer join
(
select ID, min(t_date) as min_date from TableA t1
where status = 3 and not exists (
select 1 from TableA t2
where t2.ID = t1.ID
and t2.status <> 3 and t2.t_date > t1.t_date
)
group by ID
) as md on md.ID = r.ID ...
or
select *
from r ... left outer join
(
select t1.ID, min(t1.t_date) as min_date
from TableA t1 left outer join TableA t2
on t2.ID = t1.ID and t2.status <> 3
where t1.status = 3 and t1.t_date < t2.t_date
group by t1.ID
having count(t2.ID) = 0
) as md on md.ID = r.ID ...
It also appears that you're relying on an identity column but it's not clear what those values mean. I'm basically ignoring it and using the date column instead.
Try this:
SELECT TOP 1 CONVERT( DATE, T_Date) AS T_Date
FROM TableA a1
LEFT JOIN (
SELECT ID, MAX(TableA_ID) AS MaxAID
FROM TableA
WHERE Status <> 3
GROUP BY ID
) a2 ON a2.ID = a1.ID AND a1.TableA_ID > coalesce(a2.MAXAID,0)
WHERE a1.ID = r.ID AND a1.Status = 3
ORDER BY T_Date ASC
The use of TOP 1 in combination with the unexplained r alias concern me. There's almost certainly a MUCH better way to get this data into your results that doesn't involve doing this in a sub query (unless this is for an APPLY operation).
I am trying to use a correlated subquery, but I am trying to limit it to the "best" record. When I use SQL very similiar to what follows, I get two rows per BigTable.identifier, and I wish to have only one. In the 'UNION' statement, the second half is more desirable than the first half. However, sometimes the first half will be needed. Any ideas? Here's the code:
select
BigTable.identifier,
Correlated.ID,
Correlated.Effective_Date,
Correlated.Period_Number
from
BigTable
inner join
(
select
TOP 2147483647
Table3.identifier,
Table4.Effective_Date,
Table4.Period_Number
from
Table3
inner join Table4 on Table3.matching_key = Table4.matching_key
where
Table4.Period_Number = 0
order by Table4.Effective_Date desc
UNION
select
TOP 2147483647
Table3.Identifer,
Table4.Effective_Date,
Table4.Period_Number
from
Table3
inner join Table5 on Table3.matching-key = Table5.matching-key
inner join Table4 on Table5.key1 = Table4.key1 and
Table5.key2 = Table4.key2
where
Table4.period_number = 1
order by Table4.Effective_Date desc
) as Correlated
on BigTable.identifier = Correlated.identifier
If each sub-query in that UNION had some condition which EXCLUDED the row if it was less-preferred, you would never see the less-preferred rows in the UNION.
So, if each were to have a NOT EXISTS (.... a better row in the other side of the union ....), you would eliminate less-preferred rows at the root.
I'm not clear on how you want to use effective date. Assuming you mean that you prefer Period=1 but if the Effective date is less you prefer Period=0, then something like this might work.
select
BigTable.identifier,
Correlated.ID,
Correlated.Effective_Date,
Correlated.Period_Number
from
BigTable
inner join
(
select
TOP 2147483647
Table3.identifier,
Table4.Effective_Date,
Table4.Period_Number
from
Table3
inner join Table4 on Table3.matching_key = Table4.matching_key
where
Table4.Period_Number = 0
AND NOT EXISTS
(select 1
from Table5 T5 inner join Table4 T4
on T5.key1 = T4.key1 and T5.key2 = T4.key2
where Table3.matching-key = T5.matching-key
and (T4.Effective_Date >= Table4.Effective_Date and T4.Period_Number = 1)
)
order by Table4.Effective_Date desc
UNION
select
TOP 2147483647
Table3.Identifer,
Table4.Effective_Date,
Table4.Period_Number
from
Table3
inner join Table5 on Table3.matching-key = Table5.matching-key
inner join Table4 on Table5.key1 = Table4.key1 and
Table5.key2 = Table4.key2
where
Table4.period_number = 1
AND NOT EXISTS
(select 1
from Table4 T4
where Table3.matching-key = T4.matching-key
and (T4.Period_Number > 0)
and (T4.Effective_Date > Table4.Effective_Date and T4.Period_Number = 0)
)
order by Table4.Effective_Date desc
) as Correlated
on BigTable.identifier = Correlated.identifier
i need to show some field from another table in oracle here is my query
SELECT
ANGGARAN.SIMPEG_PEGAWAI.ID_PEGAWAI AS KODE,
ANGGARAN.SIMPEG_PEGAWAI.NAMA,
ANGGARAN.SIMPEG_PEGAWAI.NIP,
ANGGARAN.SIMPEG_ESELON_JABATAN.JABATAN,
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.GOLONGAN,
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.PANGKAT,
(SELECT *
FROM (SELECT CONCAT(TO_CHAR(abs(sysdate - TO_DATE(TMT_JABATAN))/360,'9,999,999.9'),' TAHUN')
FROM SIMPEG_JABATAN where ID_PEGAWAI=KODE ORDER BY TMT_JABATAN desc)
WHERE ROWNUM = 1) AS MASA_KERJA
FROM
ANGGARAN.SIMPEG_PEGAWAI
INNER JOIN ANGGARAN.SIMPEG_ESELON_JABATAN
ON ANGGARAN.SIMPEG_PEGAWAI.ESELON_JABATAN = ANGGARAN.SIMPEG_ESELON_JABATAN.ID_ESELON_JABATAN
INNER JOIN ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT
ON ANGGARAN.SIMPEG_PEGAWAI.PANGKAT = ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.ID_GOLONGAN_PANGKAT
WHERE
ANGGARAN.SIMPEG_PEGAWAI.ST_AKTIF = 1 AND
ANGGARAN.SIMPEG_PEGAWAI.ESELON2 <> 1 AND
ANGGARAN.SIMPEG_PEGAWAI.PANGKAT >= 12 AND
ANGGARAN.SIMPEG_ESELON_JABATAN.STATUS = 1 AND
ANGGARAN.SIMPEG_ESELON_JABATAN.ID_ESELON2=2
ORDER BY
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.SORT DESC
result i got
[Err] ORA-00904: "KODE": invalid identifier
the KODE come from query ANGGARAN.SIMPEG_PEGAWAI.ID_PEGAWAI AS KODE, and used for this query
(SELECT *
FROM (SELECT CONCAT(TO_CHAR(abs(sysdate - TO_DATE(TMT_JABATAN))/360,'9,999,999.9'),' TAHUN')
FROM SIMPEG_JABATAN where ID_PEGAWAI=KODE ORDER BY TMT_JABATAN desc)
WHERE ROWNUM = 1) AS MASA_KERJA
that i miss something ? or that could be worogn using an alias in subquery where clause in oracle database ?
You can use an identifier defined in an external query in only one level deep queries. You have to rethink your strategy. My suggestion is to remove the subquery from the select list and put it in the FROM clause. And add another rownumber column like this:
(SELECT
ID_PEGAWAI,
CONCAT(TO_CHAR(abs(sysdate - TO_DATE(TMT_JABATAN))/360,'9,999,999.9'),' TAHUN') MASA_KERJA,
ROW_NUMBER() OVER (PARTITION BY ID_PEGAWAI ORDER BY TMT_JABATAN DESC) rownumber
FROM SIMPEG_JABATAN) xxx
And join like:
ON ANGGARAN.SIMPEG_PEGAWAI = xxx.ID_PEGAWAI
Then in the where clause you can do simply:
WHERE
....
AND xxx.rownumber = 1
Complete query:
SELECT
ANGGARAN.SIMPEG_PEGAWAI.ID_PEGAWAI AS KODE,
ANGGARAN.SIMPEG_PEGAWAI.NAMA,
ANGGARAN.SIMPEG_PEGAWAI.NIP,
ANGGARAN.SIMPEG_ESELON_JABATAN.JABATAN,
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.GOLONGAN,
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.PANGKAT
FROM
ANGGARAN.SIMPEG_PEGAWAI
INNER JOIN ANGGARAN.SIMPEG_ESELON_JABATAN
ON ANGGARAN.SIMPEG_PEGAWAI.ESELON_JABATAN = ANGGARAN.SIMPEG_ESELON_JABATAN.ID_ESELON_JABATAN
INNER JOIN ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT
ON ANGGARAN.SIMPEG_PEGAWAI.PANGKAT = ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.ID_GOLONGAN_PANGKAT
INNER JOIN (
SELECT
ID_PEGAWAI,
CONCAT(TO_CHAR(abs(sysdate - TO_DATE(TMT_JABATAN))/360,'9,999,999.9'),' TAHUN') MASA_KERJA,
ROW_NUMBER() OVER (PARTITION BY ID_PEGAWAI ORDER BY TMT_JABATAN DESC) rownumber
FROM SIMPEG_JABATAN
) xxx
ON ANGGARAN.SIMPEG_PEGAWAI.ID_PEGAWAI = xxx.ID_PEGAWAI
WHERE
ANGGARAN.SIMPEG_PEGAWAI.ST_AKTIF = 1 AND
ANGGARAN.SIMPEG_PEGAWAI.ESELON2 <> 1 AND
ANGGARAN.SIMPEG_PEGAWAI.PANGKAT >= 12 AND
ANGGARAN.SIMPEG_ESELON_JABATAN.STATUS = 1 AND
ANGGARAN.SIMPEG_ESELON_JABATAN.ID_ESELON2=2 AND
xxx.rownumber = 1
ORDER BY ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.SORT DESC
Oracle does not support columns aliases in WHERE clauses (or similar situations like here). You have to name the column again (by its original name).
select dummy as kode from dual where kode = 'X'
> ORA-00904: "KODE": invalid identifier
You need to assign an alias in the level below to use it in a query (I haven't checked the syntax and workability of your query, just changed the part which is essential to answer your question):
SELECT
TMP.KODE,
TMP.NAMA,
TMP.NIP,
ANGGARAN.SIMPEG_ESELON_JABATAN.JABATAN,
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.GOLONGAN,
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.PANGKAT,
(SELECT *
FROM (SELECT CONCAT(TO_CHAR(abs(sysdate - TO_DATE(TMT_JABATAN))/360,'9,999,999.9'),' TAHUN')
FROM SIMPEG_JABATAN where ID_PEGAWAI=TMP.KODE ORDER BY TMT_JABATAN desc)
WHERE ROWNUM = 1) AS MASA_KERJA
FROM
(SELECT ANGGARAN.SIMPEG_PEGAWAI.ID_PEGAWAI AS KODE, ANGGARAN.SIMPEG_PEGAWAI.* FROM ANGGARAN.SIMPEG_PEGAWAI) TMP
INNER JOIN ANGGARAN.SIMPEG_ESELON_JABATAN
ON TMP.ESELON_JABATAN = ANGGARAN.SIMPEG_ESELON_JABATAN.ID_ESELON_JABATAN
INNER JOIN ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT
ON TMP.PANGKAT = ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.ID_GOLONGAN_PANGKAT
WHERE
TMP.ST_AKTIF = 1 AND
TMP.ESELON2 <> 1 AND
TMP.PANGKAT >= 12 AND
ANGGARAN.SIMPEG_ESELON_JABATAN.STATUS = 1 AND
ANGGARAN.SIMPEG_ESELON_JABATAN.ID_ESELON2=2
ORDER BY
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.SORT DESC
Wonder if someone could give me a quick hand. I have 2 select queries (as shown below) and I want to compare the results of both and only return the result that has the most recent date.
So say I have the following 2 results from the queries:-
--------- ---------- ----------------------- --------------- ------ --
COMPANY A EMPLOYEE A 2007-10-16 17:10:21.000 E-mail 6D29D6D5 SYSTEM 1
COMPANY A EMPLOYEE A 2007-10-15 17:10:21.000 E-mail 6D29D6D5 SYSTEM 1
I only want to return the result with the latest date (so the first one). I thought about putting the results into a temporary table and then querying that but just wondering if there's a simpler, more efficient way?
SELECT * FROM (
SELECT fc.accountidname, fc.owneridname, fap.actualend, fap.activitytypecodename, fap.createdby, fap.createdbyname,
ROW_NUMBER() OVER (PARTITION BY fc.accountidname ORDER BY fap.actualend DESC) AS RN
FROM FilteredContact fc
INNER JOIN FilteredActivityPointer fap ON fc.parentcustomerid = fap.regardingobjectid
WHERE fc.statecodename = 'Active'
AND fap.ownerid = '0F995BDC'
AND fap.createdon < getdate()
) tmp WHERE RN = 1
SELECT * FROM (
SELECT fa.name, fa.owneridname, fa.new_technicalaccountmanageridname, fa.new_customerid, fa.new_riskstatusname,
fa.new_numberofopencases, fa.new_numberofurgentopencases, fap.actualend, fap.activitytypecodename, fap.createdby, fap.createdbyname,
ROW_NUMBER() OVER (PARTITION BY fa.name ORDER BY fap.actualend DESC) AS RN
FROM FilteredAccount fa
INNER JOIN FilteredActivityPointer fap ON fa.accountid = fap.regardingobjectid
WHERE fa.statecodename = 'Active'
AND fap.ownerid = '0F995BDC'
AND fap.createdon < getdate()
) tmp2 WHERE RN = 1
if the tables have the same structure (column count and column types to match), then you could just union the results of the two queries, then order by the date desc and then select the top 1.
select top 1 * from
(
-- your first query
union all
-- your second query.
) T
order by YourDateColumn1 desc
You should GROUP BY and use MAX(createdon)