Please help me make an oracle stored procedure ; I have two tables
tblLead:
lead_id Name
1 x
2 y
3 z
tblTransaction:
Tran_id lead_id date status
1 1 04/20/2010 call Later
2 1 05/05/2010 confirmed
I want a result like
lead_id Name status
1 x confirmed
2 y not available !
3 z not available !
Use an outer join to the relevant rows of tblTransaction:
SQL> SELECT l.lead_id, l.NAME,
2 CASE
3 WHEN t.status IS NULL THEN
4 'N/A'
5 ELSE
6 t.status
7 END status
8 FROM tbllead l
9 LEFT JOIN (SELECT lead_id,
10 MAX(status) KEEP(DENSE_RANK FIRST
11 ORDER BY adate DESC) status
12 FROM tbltransaction
13 GROUP BY lead_id) t ON l.lead_id = t.lead_id;
LEAD_ID NAME STATUS
---------- ---- ----------
1 x confirmed
2 y N/A
3 z N/A
Alternatively you can use analytics:
SQL> SELECT lead_id, NAME, status
2 FROM (SELECT l.lead_id, l.NAME,
3 CASE
4 WHEN t.status IS NULL THEN
5 'N/A'
6 ELSE
7 t.status
8 END status,
9 row_number()
10 over(PARTITION BY l.lead_id ORDER BY t.adate DESC) rn
11 FROM tbllead l
12 LEFT JOIN tbltransaction t ON l.lead_id = t.lead_id)
13 WHERE rn = 1;
LEAD_ID NAME STATUS
---------- ---- ----------
1 x confirmed
2 y N/A
3 z N/A
It can be written in plain SQL as follows,
SELECT lead_id, name, NVL(status,'not available !')
FROM (
SELECT tblLead.lead_id, tblLead.name, tblTransaction.status,
rank ( ) OVER (PARTITION BY tblTransaction.lead_id ORDER BY tblTransaction.datee DESC, tblTransaction.tran_id DESC) rank
FROM tblLead
LEFT JOIN tblTransaction ON tblLead.lead_id = tblTransaction.lead_id
)
WHERE rank = 1
ORDER BY lead_id;
Or you may think of writing a view as follows,
CREATE VIEW trx_view AS
------
------;
Personally I think stored procedure is not necessary for scenarios like this.
Related
I have 2 tables - tab1 , tab2 with following data
tab1 data:
OID Label
1 MX1
1 MX2
1 MX3
2 MX4
2 MX5
tab2 data:
OID ID Label
1 5678
1 2347
1 9687
2 4567
2 3455
The join condition between these two tables is oid column.I need to create a process which will update Label column from tab1 to Label column of tab2.It doesn't matter which label gets assigned to which record of tab2 for a particular oid. The only check that needs to happen is that both the tables should have same number of records for an oid.The final outcome should be the following
tab2 data:
OID ID Label
1 5678 MX1
1 2347 MX2
1 9687 MX3
2 4567 MX4
2 3455 MX5
Again, it doesn't matter which label gets assigned to tab2 for a particular oid,but the same label cannot be repeated for a particular oid.What would be the best way to write a code for this requirement?
Here is a sql solution:
merge into tab2
using
(
select t2."id" as ide,t1."label" labela from
(select rownum n,"label","oid" from tab1 order by "oid")t1,
(select rownum n, a2.* from tab2 a2 order by "oid")t2
where t1.n=t2.n and
t1."oid"=t2."oid"
) tb4
on (tab2."id" = tb4.ide)
when matched then
update set tab2."label" = tb4.labela;
Result:
oid| id | label
-----------------
1 5678 mx1
1 2347 mx2
1 9687 mx3
2 4567 mx4
2 3455 mx5
Sample tables:
SQL> select * from tab1 order by oid, label;
OID LAB
---------- ---
1 mx1
1 mx2
1 mx3
2 mx4
2 mx5
SQL> select * from tab2 order by oid, id;
OID ID LAB
---------- ---------- ---
1 2347
1 5678
1 9687
2 3455
2 4567
SQL>
This is query that returns desired result:
SQL> with
2 t1 as (select oid, label, rowid rwid,
3 row_number() over (partition by oid order by label) rn
4 from tab1
5 ),
6 t2 as (select oid, id, rowid rwid,
7 row_number() over (partition by oid order by id) rn
8 from tab2
9 )
10 select b.oid, b.id, a.label
11 from t1 a join t2 b on a.oid = b.oid and a.rn = b.rn;
OID ID LAB
---------- ---------- ---
1 2347 mx1
1 5678 mx2
1 9687 mx3
2 3455 mx4
2 4567 mx5
SQL>
A few options I tried: correlated update won't work because of
ORA-01779: cannot modify a column which maps to a non key-preserved table
SQL> update (
2 with
3 t1 as (select oid, label, rowid rwid,
4 row_number() over (partition by oid order by label) rn
5 from tab1
6 ),
7 t2 as (select oid, id, rowid rwid, label,
8 row_number() over (partition by oid order by id) rn
9 from tab2
10 )
11 select b.oid, b.id, b.label b_label, a.label a_label
12 from t1 a join t2 b on a.oid = b.oid and a.rn = b.rn
13 )
14 set b_label = a_label;
set b_label = a_label
*
ERROR at line 14:
ORA-01779: cannot modify a column which maps to a non key-preserved table
SQL>
MERGE won't work because of
ORA-01732: data manipulation operation not legal on this view
SQL> merge into
2 (select oid, id, label, row_Number() over (partition by oid order by id ) rn from tab2) b
3 using (select oid, label, row_number() over (partition by oid order by label) rn from tab1) a
4 on (a.oid = b.oid and
5 a.rn = b.rn)
6 when matched then update set
7 b.label = a.label;
(select oid, id, label, row_Number() over (partition by oid order by id ) rn from tab2) b
*
ERROR at line 2:
ORA-01732: data manipulation operation not legal on this view
SQL>
Merge would accept a view (created with create view ...), but a view has to be updateable; this one can't be because it contains analytic function.
What's left is a PL/SQL procedure:
SQL> begin
2 for cur_r in (with
3 t1 as (select oid, label, rowid rwid,
4 row_number() over (partition by oid order by label) rn
5 from tab1
6 ),
7 t2 as (select oid, id, rowid rwid,
8 row_number() over (partition by oid order by id) rn
9 from tab2
10 )
11 select b.rwid, a.label
12 from t1 a join t2 b on a.oid = b.oid and a.rn = b.rn
13 )
14 loop
15 update tab2 b set
16 b.label = cur_r.label
17 where b.rowid = cur_r.rwid;
18 end loop;
19 end;
20 /
PL/SQL procedure successfully completed.
SQL> select * from tab2 order by oid, id;
OID ID LAB
---------- ---------- ---
1 2347 mx1
1 5678 mx2
1 9687 mx3
2 3455 mx4
2 4567 mx5
SQL>
Maybe someone has another idea; I'd like to see it & learn something new.
There are two table as below
Table1
ID Name Age Active PID
-----------------------------
1 A 2 Y 100
2 A 2 Y 100
3 A 2 Y 100
4 B 3 Y 200
5 B 3 Y 200
Table2
T2ID CID
---------
10 1
20 1
30 1
40 2
50 2
60 3
70 3
80 3
90 4
100 5
110 5
I am trying to inactivate the duplicate record of table 1 and reassign the table2 record to activated rows of table 1,The result for table1 and table2 should be as below
ID Name Age Active PID
-----------------------------
1 A 2 Y 100
2 A 2 N 100
3 A 2 N 100
4 B 3 N 200
5 B 3 Y 200
T2ID CID
---------
10 1
20 1
30 1
40 1
50 1
60 1
70 1
80 1
90 5
100 5
110 5
please help for oracle query to update
You can do this by using two merge statements, like so:
Update table2:
MERGE INTO table2 tgt
USING (WITH t1 AS (SELECT ID,
NAME,
age,
active,
pid,
MIN(ID) OVER (PARTITION BY pid) min_id,
CASE WHEN COUNT(CASE WHEN active = 'Y' THEN 1 END) OVER (PARTITION BY pid) > 1 THEN 'Y' ELSE 'N' END multi_active_rows
FROM table1)
SELECT t2.t2id,
t2.cid old_cid,
t1.min_id new_cid
FROM t1
INNER JOIN table2 t2 ON t1.id = t2.cid
WHERE t1.multi_active_rows = 'Y') src
ON (tgt.t2id = src.t2id)
WHEN MATCHED THEN
UPDATE SET tgt.cid = src.new_cid;
Update table1:
MERGE INTO table1 tgt
USING (WITH t1 AS (SELECT ID,
NAME,
age,
active,
pid,
MIN(ID) OVER (PARTITION BY pid) min_id,
CASE WHEN COUNT(CASE WHEN active = 'Y' THEN 1 END) OVER (PARTITION BY pid) > 1 THEN 'Y' ELSE 'N' END multi_active_rows
FROM table1)
SELECT ID
FROM t1
WHERE multi_active_rows = 'Y'
AND ID != min_id) src
ON (tgt.id = src.id)
WHEN MATCHED THEN
UPDATE SET active = 'N';
Since we want to derive the results to update both table1 and table2 from the original dataset in table1, it's easier to update table2 first before updating table1.
This works by finding the lowest id across each set of pids in table1, plus checking to see if there is more than one active row for each pid (there's no need to do any updates if we have at most one active row available).
Once we have that information, we can use that to decide which rows to update in each table, and we can use the min_id to update table2 with, and we can update any rows in table1 where the id doesn't match the min_id to be not active.
N.B. If you could have a mix of Ys and Ns in your data, you may need to skip the and id != min_id check in the second merge statement and amend the update part to update the row to Y if the id is the min_id, otherwise set it to N.
I have a simple table with values (ID) in groups (GRP_ID).
create table tst as
select 1 grp_id, 1 id from dual union all
select 1 grp_id, 1 id from dual union all
select 1 grp_id, 2 id from dual union all
select 2 grp_id, 1 id from dual union all
select 2 grp_id, 2 id from dual union all
select 2 grp_id, 2 id from dual union all
select 3 grp_id, 3 id from dual;
It is straightforward to find a maximum value per group using analytical functions.
select grp_id, id,
max(id) over (partition by grp_id) max_grp
from tst
order by 1,2;
GRP_ID ID MAX_GRP
---------- ---------- ----------
1 1 2
1 1 2
1 2 2
2 1 2
2 2 2
2 2 2
3 3 3
But the goal is to find the maximum value excluding the value of the current row.
This is the expected result (column MAX_OTHER_ID):
GRP_ID ID MAX_GRP MAX_OTHER_ID
---------- ---------- ---------- ------------
1 1 2 2
1 1 2 2
1 2 2 1
2 1 2 2
2 2 2 2
2 2 2 2
3 3 3
Note that in the GRP_ID = 2 a tie on the MAX value exists, so the MAX_OTHER_ID remains the same.
I did manage this two step solution, but I'm wondering if there is a more straightforward and simple solution.
with max1 as (
select grp_id, id,
row_number() over (partition by grp_id order by id desc) rn
from tst
)
select GRP_ID, ID,
case when rn = 1 /* MAX row per group */ then
max(decode(rn,1,to_number(null),id)) over (partition by grp_id)
else
max(id) over (partition by grp_id)
end as max_other_id
from max1
order by 1,2
;
I wish the window functions supported multiple range specifications something like:
max(id) over (
partition by grp_id
order by id
range between unbounded preceding and 1 preceding
or range between 1 following and unbounded following
)
But unfortunately they don't.
As a workaround, you can avoid subqueries and CTEs using the function twice on the different ranges and call coalesce on that.
select grp_id,
id,
coalesce(
max(id) over (
partition by grp_id
order by id
range between 1 following and unbounded following
)
, max(id) over (
partition by grp_id
order by id
range between unbounded preceding and 1 preceding
)
) max_grp
from tst
order by 1,
2
Coalesce works out of the box because of the ordering clause as the result of the window function call will be either the max in the given window or a null value.
Demo - http://rextester.com/SDXVF13962
SELECT GRP_ID,ID, (SELECT Max(ID) FROM TEST A WHERE A.ROWID<>B.ROWID AND A.GRP_ID=B.GRP_ID) maX_ID FROM TEST B;
Got the expected result with Co-Related Query ! Hope this helps .
i have table test2.it contains
ID
1
4
5
10
now i found missing numbers in this sequence.with this query
SELECT min_ID - 1 + level mn FROM
( SELECT MIN(ID) min_ID , MAX(ID) max_ID FROM test2 )
CONNECT BY level <= max_ID - min_ID + 1 minus SELECT ID FROM test2
output is:
MN
---
2
3
6
7
8
9
now i want to combine these 2 columns.I am unable to do this please help me.
i want output like
1 2
4 3
7 5
10 6
8
9
Oracle Setup:
CREATE TABLE test2 (id) AS
SELECT 1 FROM DUAL UNION ALL
SELECT 4 FROM DUAL UNION ALL
SELECT 5 FROM DUAL UNION ALL
SELECT 10 FROM DUAL;
Query:
WITH bounds ( mn, mx ) AS (
SELECT MIN( id ), MAX( id ) FROM test2
),
missing (id, rn) AS (
SELECT id, ROWNUM
FROM (
SELECT mn + LEVEL AS id
FROM bounds
CONNECT BY LEVEL < MX - MN
MINUS
SELECT id
FROM test2
)
),
existing ( id, rn ) AS (
SELECT id, ROWNUM
FROM test2
)
SELECT e.id, m.id
FROM existing e
FULL OUTER JOIN
missing m
ON ( e.rn = m.rn );
Output
ID ID
---------- ----------
1 2
4 3
5 6
10 7
9
8
I'm using Oracle 11g R1 database. Please help me with what I'm trying to achive.
Table 1
-------
ID Name Status
-- ---- ------
1 John 0
2 Chris 0
3 Joel 0
4 Mike 0
5 Henry 0
Table 2
-------
ID Status ResponseDate
-- ------ -------------
1 0 1-Jan-2013
1 1 31-Jan-2013
1 2 3-Feb-2013
1 6 19-Jan-2013
2 6 3-Mar-2013
2 2 1-Mar-2013
2 1 4-Mar-2013
2 0 2-Mar-2013
3 0 3-Feb-2013
3 1 2-Feb-2013
3 2 1-Feb-2013
4 2 4-Apr-2013
4 1 6-Apr-2013
4 0 1-Apr-2013
5 1 31-Mar-2013
5 6 4-Apr-2013
5 3 10-Jan-2013
I would like to update Table1.status based on the most recent response the ID's have returned. So, the statuses in Table1 should finally be updated as below,
ID Name Status
-- ---- ------
1 John 2
2 Chris 1
3 Joel 0
4 Mike 1
5 Henry 6
update table1 t1
set status = (
select max(status) keep (dense_rank last order by responsedate)
from table2 t2
where t2.id = t1.id
);
update table1 t1
set status =
(
select status
from table2
where id = t1.id and responseDate =
(
select max(responseDate)
from table2
where id = t1.id
)
)
Of course you can update status column of the table1 every time a need arises, but you might consider to create a view, v_table_1 for instance, which will provide you with fresh and up to date information:
create or replace view V_Table1 as
select max(t.id) as id
, max(t.name) as name
, max(q.status) keep(dense_rank first
order by q.ResponseDate desc) as status
from table_1 t
join table_2 q
on (q.id = t.id)
group by t.id
Result:
select *
from V_Table1
ID1 NAME1 STATUS
-------- ----- ----------
1 John 2
2 Chris 1
3 Joel 0
4 Mike 1
5 Henry 6