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Rotate/pivot table with aggregation in Oracle
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Closed 1 year ago.
I have a select query that returns results like below.
I want to update the query to transpose the rows into columns to make it look like the Output table --
I have tried using Pivot but it is not working. Appreciate any help. Thanks
I got the required output. However, if there are multiple values for same ID and fieldname, how to get all of them. Sample i/p and o/p is below.
I/P:
O/P:
With pivot you could do:
select *
from your_table
pivot (
max(coalesce(text, to_char(num)))
for (fieldname) in ('Width' as width, 'Height' as height, 'Comments' as comments))
ID WIDTH HEIGHT COMMENTS
---- ----- ------ ---------
1051 121 2 FP-SK/124
1170 5678 5
I've used max(coalesce(text, to_char(num))) because you have two columns to cram into one, effectively, and you need to_char() because they are different data types. If a row could have a value in both columns then the value you end up with might not be what you want, but then you'd need to define what should happen in that case.
You could also use conditional aggregation, which is what pivot does under the hood anyway; here simplified to not coalesce, on the assumption you won't have both columns populated:
select id,
max(case when fieldname = 'Width' then text end) as width,
max(case when fieldname = 'Height' then num end) as height,
max(case when fieldname = 'Comments' then text end) as comments
from your_table
group by id
ID WIDTH HEIGHT COMMENTS
---- ----- ------ ---------
1051 121 2 FP-SK/124
1170 5678 5
db<>fiddle
Notice that the height value is now a number; in the pivot version it is - and must be - a string. You can convert the result to a different data type of course.
How do we get multiple values in the output separated by commas
You can change from max() to listagg():
select *
from your_table
pivot (
listagg(coalesce(text, to_char(num)), ',')
for (fieldname) in ('Width' as width, 'Height' as height, 'Comments' as comments))
or
select id,
listagg(case when fieldname = 'Width' then text end, ',') within group (order by text) as width,
listagg(case when fieldname = 'Height' then num end, ',') within group (order by text) as height,
listagg(case when fieldname = 'Comments' then text end, ',') within group (order by text) as comments
from your_table
group by id
which both get
ID WIDTH HEIGHT COMMENTS
---- ---------- ---------- ----------
1051 121,95 Sample
1170 5678 2,5
db<>fiddle
Related
I have a column "Names" in the "Employee" table that has following values. The values either contain only single name (first, last, username) or Multiple names separated with semicolon (;). I need to search the values from that table either by first name or last name or username.
I have created a procedure but it is fetching only 1st,4th,5th records. Please let me know how to retrieve 2nd and 3rd records as well.
Firstname and lastname can be given by user with minimum of 2 characters length.
Username is given entire.
Employee:
ID Name Title
1 Andrea Warbutton (awr01) Manager
2 Claire Taylor (cta02);Mark Kites (mak03);Anitha Rooney (anr06) HOD;Supervisor;Business
3 Dave Rites (dar12);Jessica Simpson (jesi10) Lead;Analyst
4 Nick Ken (nik56) Product (Local,Regional)
5 Claire Pilkington (cpt09) Sales Owner
Code:
Create or replace empl (pm_firstname varchar2(100),
pm_lastname varchar2(100),
pm_username varchar2(100))
BEGIN
Select * from Employee
where Upper(Name) like Upper(pm_firstname ||'%'||) -- this will fetch 1st,4th,5th record
OR Upper(SUBSTR(Name, INSTR(Name),' '+1)) like Upper(pm_lastname ||'%'||) -- this will fetch 1st,4th,5th record
OR upper(REGEXP_SUBSTR(Name,'\((.+)\)',1,1,NULL,1)) = Upper(pm_username); -- -- this will fetch 1st,4th,5th record
END;
End empl ;
Please let me know how to retrieve 2nd and 3rd records as well.
Desired Output:
When searched with firstname = "Andrea", the output is below
ID Name Title
1 Andrea Warbutton (awr01) Manager
When searched with firstname = "Claire", the output is below
ID Name Title
2 Claire Taylor (cta02) HOD
5 Claire Pilkington (cpt09) Sales Owner
When searched with lastname = "Simps", the output is below
ID Name Title
3 Jessica Simpson (jesi10) Analyst
When searched with username = "mak03", the output is below
ID Name Title
2 Mark Kites (mak03) Supervisor
When searched with username = "nik56", the output is below
ID Name Title
4 Nick Ken (nik56) Product (Local,Regional)
with
x as (select id, name, '"'||replace(name, ';', '","')||'"' xml from employee),
n as (select id, name, column_value as cv from x, xmltable(xml))
select id,
trim(regexp_substr(cv, '(\S*)(\s)')) fname,
trim(regexp_substr(cv, '(\S*)(\s)', 1, 2)) lname,
regexp_substr(cv, '\((.+)\)', 1, 1, NULL, 1) uname
from n
Your task would be much easier if you normalize these data. Above query outputs:
ID FNAME LNAME UNAME
1 Andrea Warbutton awr01
2 Claire Taylor cta02
2 Mark Kites mak03
2 Anitha Rooney anr06
3 Dave Rites dar12
3 Jessica Simpson jesi10
4 Nick Ken nik56
5 Claire Pilkington cpt09
demo
Now you can search first, last, usernames however you want. First expression finds first word, then second and word between brackets.
Edit:
I posted the table structure with just ID and Name columns. However, I
have Titles column also in the same format separated with (semicolon).
In this case, How can I Normalize Titles as well along with Names
This query worked for provided examples:
with
x as (select id, name, '"'||replace(name, ';', '","')||'"' xmln,
'"'||replace(title, ';', '","')||'"' xmlt
from employee),
n1 as (select id, trim(xn.column_value) nm, rownum rn from x, xmltable(xmln) xn),
n2 as (select id, trim(xt.column_value) tt, rownum rn from x, xmltable(xmlt) xt)
select id, trim(regexp_substr(nm, '(\S*)(\s)')) fname,
trim(regexp_substr(nm, '(\S*)(\s)', 1, 2)) lname,
regexp_substr(nm, '\((.+)\)', 1, 1, NULL, 1) uname,
tt title
from n1 join n2 using (id, rn)
dbfiddle demo
Be careful however, because we cannot write ideal query. If you have entries like Benicio Del Toro, Mary Jo Catlett, Jean Claude Van Damme, it's impossible to write correct regexp. Sometimes second word is part of lastname, sometimes it is firstname, middlename etc.
The proper way is to modify table structure, divide rows, check results and put correct values in correct name columns. Now you have lists which are hard to search and every method may return wrong results.
No need for PL/SQL.
SQL> with temp as
2 (select id,
3 regexp_substr(name, '[^;]+', 1, column_value) name
4 from employee cross join
5 table(cast(multiset(select level from dual
6 connect by level <= regexp_count(name, ';') + 1
7 ) as sys.odcinumberlist))
8 )
9 select id, name
10 from temp
11 where instr(name, '&search_for_name') > 0;
Enter value for search_for_name: Claire
ID NAME
---------- ------------------------------
2 Claire Taylor (cta02)
5 Claire Pilkington (cpt09)
SQL> /
Enter value for search_for_name: mak03
ID NAME
---------- ------------------------------
2 Mark Kites (mak03)
SQL>
What does it do?
temp CTE splits semi-colon separated values into rows
final query uses a simple instr function which detects whether "rows" (extracted previously) contain value you're looking for
If it must be a function, that code can be reused. As you didn't say what exactly (which datatype, I mean) you want to return, I returned a string.
SQL> create or replace function f_search (par_what in varchar2)
2 return sys.odcivarchar2list
3 is
4 retval sys.odcivarchar2list;
5 begin
6 with temp as
7 (select id,
8 regexp_substr(name, '[^;]+', 1, column_value) name
9 from employee cross join
10 table(cast(multiset(select level from dual
11 connect by level <= regexp_count(name, ';') + 1
12 ) as sys.odcinumberlist))
13 )
14 select id ||' - '|| name
15 bulk collect into retval
16 from temp
17 where instr(name, par_what) > 0;
18
19 return retval;
20 end;
21 /
Function created.
SQL> select * from table(f_search('Andrea'));
COLUMN_VALUE
--------------------------------------------------------------------------------
1 - Andrea Warbutton (awr01)
SQL> select * from table(f_search('Claire'));
COLUMN_VALUE
--------------------------------------------------------------------------------
2 - Claire Taylor (cta02)
5 - Claire Pilkington (cpt09)
SQL>
I want to Delete the Duplicates from the table update the unique identifier and merge it with the already existing record.
I have a table which can contain following records -
ID Name Req_qty
1001 ABC-02/01+Time 10
1001 ABC-03/01+Time 20
1001 ABC 30
1002 XYZ 40
1003 DEF-02/01+Time 10
1003 DEF-02/01+Time 20
And I am expecting the records after the operation as follows:
ID Name Req_Qty
1001 ABC 60
1002 XYZ 40
1003 DEF 30
Any assistance would be really helpful. Thanks!
It is possible to do this in a single SQL statement:
merge into (select rowid as rid, x.* from test_table x ) o
using ( select id
, regexp_substr(name, '^[[:alpha:]]+') as name
, sum(reg_qty) as reg_qty
, min(rowid) as rid
from test_table
group by id
, regexp_substr(name, '^[[:alpha:]]+')
) n
on (o.id = n.id)
when matched then
update
set o.name = n.name
, o.reg_qty = n.reg_qty
delete where o.rid > n.rid;
Working example
This uses a couple of tricks:
the delete clause of a merge statement will only operate on data that has been updated, and so there's no restriction on what gets updated.
you can't select rowid from a "view" and so it's faked as rid before updating
by selecting the minimum rowid from per ID we make a random choice about which row we're going to keep. We can then delete all the rows that have a "greater" rowid. If you have a primary key or any other column you'd prefer to use as a discriminator just substitute that column for rowid (and ensure it's indexed if your table has any volume!)
Note that the regular expression differs from the other answer; it uses caret (^) to anchor the search for characters to the beginning of the string before looking for all alpha characters thereafter. This isn't required as the default start position for REGEXP_SUBSTR() is the first (1-indexed) but it makes it clearer what the intention is.
In your case, you will need to update the records first and then delete the records which are not required as following (Update):
UPDATE TABLE1 T
SET T.REQ_QTY = (
SELECT
SUM(TIN.REQ_QTY) AS REQ_QTY
FROM
TABLE1 TIN
WHERE TIN.ID = T.ID
)
WHERE (T.ROWID,1) IN
(SELECT TIN1.ROWID, ROW_NUMBER() OVER (PARTITION BY TIN1.ID)
FROM TABLE1 TIN1); --TAKING RANDOM RECORD FOR EACH ID
DELETE FROM TABLE1 T
WHERE NOT EXISTS (SELECT 1 FROM TABLE1 TIN
WHERE TIN.ID = T.ID AND TIN.REQ_QTY > T.REQ_QTY);
UPDATE TABLE1 SET NAME = regexp_substr(NAME,'[[:alpha:]]+');
--Update--
The following merge should work for you
MERGE INTO
(select rowid as rid, T.* from MY_TABLE1 T ) MT
USING
(
SELECT * FROM
(SELECT ID,
regexp_substr(NAME,'^[[:alpha:]]+') AS NAME_UPDATED,
SUM(Req_qty) OVER (PARTITION BY ID) AS Req_qty_SUM,
ROWID AS RID
FROM MY_TABLE1) MT1
WHERE RN = 1
) mt1
ON (MT.ID = MT1.ID)
WHEN MATCHED THEN
UPDATE SET MT.NAME = MT1.NAME_UPDATED, MT.Req_qty = MT1.Req_qty_SUM
delete where (MT.RID <> MT1.RID);
Cheers!!
I have two tables,PRODUCTS AND LOOKUP TABLES.Now i want to order the KEY Column in products table based on KEY column value in LOOKUP TABLE.
CREATE TABLE PRODUCTS
(
ID INT,
KEY VARCHAR(50)
)
INSERT INTO PRODUCTS
VALUES (1, 'EGHS'), (2, 'PFE'), (3, 'EGHS'),
(4, 'PFE'), (5, 'ABC')
CREATE TABLE LOOKUP (F_KEY VARCHAR(50))
INSERT INTO LOOKUP VALUES('PFE,EGHS,ABC')
Now I want to order the records in PRODUCTS table based on KEY (PFE,EGHS,ABC) values in LOOKUP table.
Example output:
PRODUCTS
ID F_KEY
-----------
2 PFE
4 PFE
1 EGHS
3 EGHS
5 ABC
I use this query, but it is not working
SELECT *
FROM PRODUCTS
ORDER BY (SELECT F_KEY FROM LOOKUP)
You can split the string using XML. You first need to convert the string to XML and replace the comma with start and end XML tags.
Once done, you can assign an incrementing number using ROW_NUMBER() like following.
;WITH cte
AS (SELECT dt,
Row_number()
OVER(
ORDER BY (SELECT 1)) RN
FROM (SELECT Cast('<X>' + Replace(F.f_key, ',', '</X><X>')
+ '</X>' AS XML) AS xmlfilter
FROM [lookup] F)F1
CROSS apply (SELECT fdata.d.value('.', 'varchar(500)') AS DT
FROM f1.xmlfilter.nodes('X') AS fdata(d)) O)
SELECT P.*
FROM products P
LEFT JOIN cte C
ON C.dt = P.[key]
ORDER BY C.rn
Online Demo
Output:
ID F_KEY
-----------
2 PFE
4 PFE
1 EGHS
3 EGHS
5 ABC
You may do it like this:
SELECT ID, [KEY] FROM PRODUCTS
ORDER BY
CASE [KEY]
WHEN 'PFE' THEN 1
WHEN 'EGHS' THEN 2
WHEN 'ABC' THEN 3
END
I want to write a simple pl/sql or mssql
For selecting the car id which is red and at the same time black.
sample:
ID | Color
1 | Red
1 | Black
2 | Brown
2 | Red
3 | Black
3 | Yellow
What i want is:
ID
1
Here is a SQL standard way that works in either database:
select id
from sample s
group by id
having sum(case when color = 'red' then 1 else 0 end) > 0 and
sum(case when color = 'black' then 1 else 0 end) > 0;
Each condition in the having clause counts the number of rows that match one of the colors. Only ids that have each color will be included in the final result set.
EDIT:
You can add where color in ('red', 'black') before the group by. Depending on the data and indexes, this could significantly improve the performance of the query.
SELECT ID
FROM YourTable
WHERE Color IN ('Red','Black')
GROUP BY ID
HAVING COUNT(*) = 2
This will select only the ids:
select id
from mytable
where color in ('Red', 'Black')
group by id
having count(color) =2
Use it as an inner select to get colors as well.
select id, color
where color in ('Red', 'Black')
from mytable where id in (
select id
from mytable
where color in ('Red', 'Black')
group by id
having count(color) =2
)
For pl/sql, a subselect using IN is just fine with appropriate indexes:
SELECT DISTINCT Id
FROM yourTable
WHERE Color = 'Black' AND Id IN
(SELECT DISTINCT Id FROM yourTable WHERE Color = 'Red')
And apparently, for SQL Server as well.
The take-away from the articles (always read them, though, Quassnoi is one heck of a DB guy and a fun writer as well) is that IN may look inefficient, but it isn't necessarily on modern engines.
select ID from YourTable T1
where exists (select * from YourTable where ID = T1.ID and Color = 'Red')
and exists (select * from YourTable where ID = T1.ID and Color = 'Black')
I am newbie to Oracle but have worked on mysql previously. We have migrated the database from mysql to oracle and want help in this scenario.
I have table in the oracle 10g which is in the following format:
student_id student_key student_value
---------- ----------- -------------
1 name john
2 name bill
1 age 28
2 age 26
2 result pass
now i want to create a pivot on it so i use the following query:
select student_id, decode(student_key, 'name', student_Value, null) as studentName
from student_table
the output comes as
student_id studentName
---------- -----------
1 john
1 null
2 bill
2 null
2 null
Oracle 11 has specialized PIVOT functionality (a nice introduction is here), but 10g doesn't. Here's how to do it in 10g:
SELECT
student_id,
MAX(CASE WHEN student_key = 'name' THEN student_value END) AS StudentName,
MAX(CASE WHEN student_key = 'age' THEN student_value END) AS Age,
MAX(CASE WHEN student_key = 'result' THEN student_value END) AS Result
FROM myTable
GROUP BY student_id
As with the Oracle PIVOT command, you need to know the number of output columns ahead of time.
Also note that MAX is used because we're rolling rows up to columns, which means we have to group, which means we need an aggregate function, so why not MAX? If you use MIN instead of MAX you'll get the same results.