I have such table:
Id code
1 10
2 11
3 20
4 21
5 30
6 31
7 32
8 40
9 10
10 11
11 20
12 21
13 30
14 31
15 32
16 40
17 20
18 21
19 30
20 31
21 32
22 40
23 20
24 21
25 30
26 31
27 32
28 40
29 20
30 21
31 30
32 31
33 32
34 40
35 20
36 21
37 30
38 31
39 32
40 40
41 41
42 90
The column id represents simply the order of the records.
The column code represent the type of record.
The problem is that the records are part of a hierarchy, as shown here:
What I need to obtain is the parent of every record:
Id code Parent
1 10 1
2 11 1
3 20 1
4 21 3
5 30 3
6 31 3
7 32 3
8 40 3
9 10 9
10 11 9
11 20 9
12 21 11
13 30 11
14 31 11
15 32 11
16 40 11
17 20 9
18 21 17
19 30 17
20 31 17
21 32 17
22 40 17
23 20 9
24 21 23
25 30 23
26 31 23
27 32 23
28 40 23
29 20 9
30 21 29
31 30 29
32 31 29
33 32 29
34 40 29
35 20 9
36 21 35
37 30 35
38 31 35
39 32 35
40 40 35
41 41 40
42 90 42
The parent of every record should be expressed as its Id.
The rules are like this:
10s are their own parents since they are the roots
90s are their own parents since they are the end of data
20s parent is the previous 10
21 30 31 32 33 parent is the previous 20
40 and 50 parents is the previous 20
41 parent is the previous 40
As you can see the order in which records are is very important.
I tried to solve this declaratively (with lag() etc) and imperatively with loops but I could not find a solution.
Please help
This should work. Probably not optimal performance, but its pretty clear what its doing so should be easy to modify if (when!) your hierarchy changes.
It can obviously produce nulls if your hierarchy or ordering is not as you have prescribed
CREATE TABLE #data(id INT, code INT);
INSERT INTO #data values
(1 , 10),(2 , 11),(3 , 20),(4 , 21),(5 , 30),(6 , 31),(7 , 32),(8 , 40),(9 , 10),(10 , 11),
(11 , 20),(12 , 21),(13 , 30),(14 , 31),(15 , 32),(16 , 40),(17 , 20),(18 , 21),(19 , 30),(20 , 31),
(21 , 32),(22 , 40),(23 , 20),(24 , 21),(25 , 30),(26 , 31),(27 , 32),(28 , 40),(29 , 20),(30 , 21),
(31 , 30),(32 , 31),(33 , 32),(34 , 40),(35 , 20),(36 , 21),(37 , 30),(38 , 31),(39 , 32),(40 , 40),
(41 , 41),(42 , 90);
WITH
tens AS (SELECT id FROM #data WHERE code = 10),
twenties AS (SELECT id FROM #data WHERE code = 20),
forties AS (SELECT id FROM #data WHERE code = 40)
SELECT #data.id,
#data.code,
CASE WHEN code IN (10,90) THEN #data.id
WHEN code IN (11,20) THEN prev_ten.id
WHEN code IN (21,30,31,32,33,40,50) THEN prev_twenty.id
WHEN code = 41 THEN prev_forty.id
ELSE NULL
END AS Parent
FROM #data
OUTER APPLY (SELECT TOP (1) id FROM tens WHERE tens.id < #data.id ORDER BY tens.id DESC) AS prev_ten
OUTER APPLY (SELECT TOP (1) id FROM twenties WHERE twenties.id < #data.id ORDER BY twenties.id DESC) AS prev_twenty
OUTER APPLY (SELECT TOP (1) id FROM forties WHERE forties.id < #data.id ORDER BY forties.id DESC) AS prev_forty;
i think u should add FOREIGN KEY parentId referencing Id to existing table, fill this new column by UPDATE or gain data to fill it from external source and then u should do SELECT * FROM tableName ORDER BY parentId to receive tree structure
Hi guys im trying to transpose a row query result to 1 row per columns
1st query is select * from sku;
the result is :
id sku sku_code travel_code
1 sku1 1 1
2 sku1 2 2
3 sku1 3 3
4 sku1 4 4
5 sku1 5 5
6 sku1 6 6
7 sku1 7 7
8 sku2 8 8
9 sku2 9 9
10 sku2 10 10
11 sku2 11 11
12 sku2 12 12
13 sku2 13 13
14 sku2 14 14
15 sku3 15 15
16 sku3 16 16
17 sku3 17 17
18 sku3 18 18
19 sku3 19 19
20 sku3 20 21
21 sku3 21 21
expected output is
SKU SKU_CODE TRAVEL_CODE
sku1 1 2 3 4 5 6 7 1 2 3 4 5 6 7
sku2 8 9 10 11 12 13 14 8 9 10 11 12 13 14
sku3 15 16 17 18 19 20 21 15 16 17 18 19 20 21
no header is ok
You can use grouping with min and max aggregation functions
with tab(sku, sku_cod, travel_code) as
(
select 'sku1',109,'01' union all
select 'sku2',209,'02' union all
select 'sku2',309,'03' union all
select 'sku1',409,'04'
)
select sku, min(sku_cod) as sku_cod1, max(sku_cod) as sku_cod2,
min(travel_code) as travel_code1, max(travel_code) as travel_code2
from tab
group by sku
order by sku;
sku sku_cod1 sku_cod2 travel_code1 travel_code2
sku1 109 409 01 04
sku2 209 309 02 03
You are using Postgres, so I would recommend storing the values as arrays:
select sku, array_agg(sku_cod) as sku_cods
array_agg(travel_code) as travel_codes
from t
group by sku
order by sku;
This will allow you to handle more than two values.
I have a query where I would like to manipulate a column to return an array conatining only the max-value from the last 12 values from another column (due to other parts of the query).
Example:
I want to add the column MaxLast12 from:
Month Power
1 10
2 16
3 8
4 14
5 15
6 3
7 6
8 10
9 11
10 12
11 12
12 12
13 18
14 12
To become:
Month Power MaxLast12
1 10 10
2 16 16
3 8 16
4 14 16
5 15 16
6 3 16
7 6 16
8 17 17
9 11 17
10 12 17
11 12 17
12 12 17
13 18 18
14 12 18
It would also help to be able to create a simpler solution where I only include the 12 rows in the query (won't be as accurate but good enough for the purpose) with only the maximum value. Would need to do the following:
Month Power
1 6
2 6
3 8
4 14
5 15
6 3
7 6
8 10
9 11
10 12
11 12
12 12
To become:
Month Power YearMax
1 10 17
2 16 17
3 8 17
4 14 17
5 15 17
6 3 17
7 6 17
8 17 17
9 11 17
10 12 17
11 12 17
12 12 17
Since I'm guessing both problems solution will be similar, any help possible is appriciated. Would like to avoid usign GROUP BY clause since I'm modifying an existing kind of complex query.
Tried to achive this using max() with no luck.
I am using SQL-developer.
In Oracle you would use window functions:
select month, power,
max(power) over (order by month rows between 11 preceding and current row)
from t;
I have a table named team and it like below: I just added a row_number in the 3rd column
RaidNo OutComeID RN
2 15 1
4 15 2
6 14 3
8 16 4
10 16 5
12 14 6
14 16 7
16 15 8
18 15 9
20 16 10
22 12 11
24 16 12
26 16 13
28 16 14
30 15 15
32 14 16
34 13 17
When the OutcomeId came as 16 then start with one and 16 comes consecutively, add one by one. And the results be like
RaidNo OutComeID RN Result
2 15 1 0
4 15 2 0
6 14 3 0
8 16 4 1
10 16 5 2
12 14 6 0
14 16 7 1
16 15 8 0
18 15 9 0
20 16 10 1
22 12 11 0
24 16 12 1
26 16 13 2
28 16 14 3
30 15 15 0
32 14 16 0
34 13 17 0
Help me to get the result.
You can use the following query:
SELECT RaidNo, OutComeID, RN,
CASE
WHEN OutComeID <> 16 THEN 0
ELSE ROW_NUMBER() OVER (PARTITION BY OutComeID, grp ORDER BY RN)
END AS Result
FROM (
SELECT RaidNo, OutComeID, RN,
RN - ROW_NUMBER() OVER (PARTITION BY OutComeID ORDER BY RN) AS grp
FROM mytable) AS t
ORDER BY RN
Field grp identifies slices (also called islands) of consecutive records having the same OutComeID value. The outer query uses grp in order to enumerate each record that belongs to a '16' slice. The records that belong to the other slices are assigned value 0.
Demo here
Given the following tables
table message
id message time_send
14 "first" 2014-02-10 22:16:31
15 "second" 2014-02-14 09:35:20
16 "third" 2014-02-13 09:35:47
17 "fourth" 2014-03-10 22:16:31
18 "fifth" 2014-03-14 09:35:20
19 "sixth" 2014-04-12 09:35:47
20 "seventh" 2014-04-13 09:35:47
21 "eighth" 2014-04-14 09:35:47
table message_owner
id message_id owner_id cp_id
1 14 1 4
2 14 4 1
3 15 12 4
4 15 4 12
5 16 4 1
6 16 1 4
7 17 12 4
8 17 4 12
9 18 4 1
10 18 1 4
11 19 12 4
12 19 4 12
13 20 12 1
14 20 1 12
15 21 12 7
16 21 7 12
I want to query the most recent message with every counter party(cp_id) for a given owner.
For example for owner_id=4 I would like the following output:
id message time_send owner_id cp_id
18 "fifth" 2014-03-14 09:35:20 4 1
19 "sixth" 2014-02-13 09:35:47 4 12
I see a lot of examples with one table but I am not able to transpose them in a multitable example.
edit1: adding more entries
This should work:
SELECT m.id, m.message, mo.owner_id, mo.cp_id
FROM message m
JOIN message_owner mo ON m.id=mo.message_id
WHERE mo.owner_id=4
AND m.time_send=(
SELECT MAX(time_send)
FROM message m2
JOIN message_owner mo2 ON mo2.message_id=m2.id
WHERE mo2.owner_id=mo.owner_id
AND mo2.cp_id =mo.cp_id
)
... notice though that putting a WHERE condition on a timestamp column can sometimes not work correctly.
Same example without jointures:
SELECT m.id, m.time_send, m.message, mo.owner_id, mo.cp_id
FROM message m, message_owner mo
WHERE m.id = mo.message_id
AND mo.owner_id = 4
AND m.time_send = (
SELECT MAX(time_send)
FROM message m2, message_owner mo2
WHERE mo2.message_id = m2.id
AND mo2.owner_id = mo.owner_id
AND mo2.cp_id = mo.cp_id
);
http://sqlfiddle.com/#!2/558d7/4