I need to find a particular value contained in the SQL Server HierarchyId column. The value can occur at any level. Here is a sample code to illustrate the issue:
CREATE TABLE mytable
(
Id INT NOT NULL PRIMARY KEY,
TeamName VARCHAR(20) NOT NULL,
MyHierarchyId HIERARCHYID NOT NULL
);
INSERT INTO mytable(Id, TeamName, MyHierarchyId)
VALUES (1, 'Corporate','/1/');
INSERT INTO mytable(Id, TeamName, MyHierarchyId)
VALUES (2, 'Group A','/1/2/');
INSERT INTO mytable(Id, TeamName, MyHierarchyId)
VALUES (3, 'Team X','/1/2/3/');
INSERT INTO mytable(Id, TeamName, MyHierarchyId)
VALUES (4, 'Group B','/1/4/');
INSERT INTO mytable(Id, TeamName, MyHierarchyId)
VALUES (5, 'Team Y','/1/4/5/');
INSERT INTO mytable(Id, TeamName, MyHierarchyId)
VALUES (6, 'Team Z','/1/4/6/');
Now I would like to find all the records, which are associated with the Id = 4. This means records 4, 5 and 6. I could use a brute force methods like this:
SELECT [M].[Id],
[M].[TeamName],
[M].[MyHierarchyId],
[M].[MyHierarchyId].ToString() AS Lineage
FROM [dbo].[mytable] AS [M]
WHERE [M].[MyHierarchyId].ToString() LIKE '%4%'
But I suspect this will be very inefficient. Once again, the problem is that the level of the node I am searching for is not known in advance.
Thank you for any recommendations.
You can use IsDescendantOf()
Select *
from mytable
Where MyHierarchyID.IsDescendantOf( (select MyHierarchyID from mytable where id=4) ) = 1
Results
Id TeamName MyHierarchyId
4 Group B 0x5C20
5 Team Y 0x5C3180
6 Team Z 0x5C3280
Related
Please help with SQL query. I've got a table:
CREATE TABLE PCDEVUSER.tabletest
(
id INT PRIMARY KEY NOT NULL,
name VARCHAR2(64),
pattern INT DEFAULT 1 NOT NULL,
tempval INT
);
Let's pretend it was filled with values:
INSERT INTO TABLETEST (ID, NAME, PATTERN, TEMPVAL) VALUES (1, 'A', 1, 10);
INSERT INTO TABLETEST (ID, NAME, PATTERN, TEMPVAL) VALUES (2, 'A', 1, 20);
INSERT INTO TABLETEST (ID, NAME, PATTERN, TEMPVAL) VALUES (3, 'A', 2, 10);
INSERT INTO TABLETEST (ID, NAME, PATTERN, TEMPVAL) VALUES (5, 'A', 2, 20);
INSERT INTO TABLETEST (ID, NAME, PATTERN, TEMPVAL) VALUES (4, 'A', 2, 30);
And I need to update all records (grouped by pattern) with NO MAX value TEMPVALUE. So as result I have to update records with Ids (1, 3, 5). Records with IDs (2, 4) has max values in there PATTERN group.
HELP PLZ
This select statement will help you get the IDs you need :
SELECT
*
FROM
(SELECT
id
,name
,pattern
,tempval
,MAX(tempval) OVER (PARTITION BY pattern) max_tempval
FROM
tabletest
)
WHERE 1=1
AND tempval != max_tempval
;
You should be able to build an update statement around that easily enough
Something like this:
update tabletest t
set ????
where t.tempval < (select max(tempval) from tabletest tt where tt.pattern = t.pattern);
It is unclear what values you want to set. The ???? is for the code that sets the values.
I have 3 tables with the following schema
create table main (
main_id int PRIMARY KEY,
secondary_id int NOT NULL
);
create table secondary (
secondary_id int NOT NULL,
tags varchar(100)
);
create table bad_words (
words varchar(100) NOT NULL
);
insert into main values (1, 1001);
insert into main values (2, 1002);
insert into main values (3, 1003);
insert into main values (4, 1004);
insert into secondary values (1001, 'good word');
insert into secondary values (1002, 'bad word');
insert into secondary values (1002, 'good word');
insert into secondary values (1002, 'other word');
insert into secondary values (1003, 'ugly');
insert into secondary values (1003, 'bad word');
insert into secondary values (1004, 'pleasant');
insert into secondary values (1004, 'nice');
insert into bad_words values ('bad word');
insert into bad_words values ('ugly');
insert into bad_words values ('worst');
expected output
----------------
1, 1000, good word, 0 (boolean flag indicating whether the tags contain any one of the words from the bad_words table)
2, 1001, bad word,good word,other word , 1
3, 1002, ugly,bad word, 1
4, 1003, pleasant,nice, 0
I am trying to use case to select 1 or 0 for the last column and use a join to join the main and secondary table, but getting confused and stuck. Can someone please help me with a query ? These tables are stored in redshift and i want query compatible with redshift.
you can use the above schema to try your query in sqlfiddle
EDIT: I have updated the schema and expected output now by removing the PRIMARY KEY in secondary table so that easier to join with the bad_words table.
You can use EXISTS and a regex comparison with \m and \M (markers for beginning and end of a word, respectively):
with
main(main_id, secondary_id) as (values (1, 1000), (2, 1001), (3, 1002), (4, 1003)),
secondary(secondary_id, tags) as (values (1000, 'very good words'), (1001, 'good and bad words'), (1002, 'ugly'),(1003, 'pleasant')),
bad_words(words) as (values ('bad'), ('ugly'), ('worst'))
select *, exists (select 1 from bad_words where s.tags ~* ('\m'||words||'\M'))::int as flag
from main m
join secondary s using (secondary_id)
select main_id, a.secondary_id, tags, case when c.words is not null then 1 else 0 end
from main a
join secondary b on b.secondary_id = a.secondary_id
left outer join bad_words c on c.words like b.tags
SELECT m.main_id, m.secondary_id, t.tags, t.is_bad_word
FROM srini.main m
JOIN (
SELECT st.secondary_id, st.tags, exists (select 1 from srini.bad_words b where st.tags like '%'+b.words+'%') is_bad_word
FROM
( SELECT secondary_id, LISTAGG(tags, ',') as tags
FROM srini.secondary
GROUP BY secondary_id ) st
) t on t.secondary_id = m.secondary_id;
This worked for me in redshift and produced the following output with the above mentioned schema.
1 1001 good word false
3 1003 ugly,bad word true
2 1002 good word,other word,bad word true
4 1004 pleasant,nice false
I have researched this and know I'm not the first to ask but I can't seem to get my head around it. I have created a simple example that I think will help me crack it if someone can provide the missing link!
I have a table of areas that contains continents and countries in a hierarchy.
I also have a table of places that contains cities and landmarks in a hierarchy. This table contains an area id column to join to the areas table.
create table areas
(
id NUMBER not null,
name VARCHAR2(200) not null,
parent_id NUMBER
);
-- Top Level
Insert into areas (id, name)
Values (1, 'Europe');
Insert into areas (id, name)
Values (2, 'Americas');
Insert into areas (id, name)
Values (3, 'Asia ex Japan');
Insert into areas (id, name)
Values (4, 'Japan');
-- Jurisdictions
Insert into areas (id, name, parent_id)
Values (5, 'UK', 1);
Insert into areas (id, name, parent_id)
Values (7, 'France', 1);
Insert into areas (id, name, parent_id)
Values (6, 'Germany', 1);
Insert into areas (id, name, parent_id)
Values (8, 'Italy', 1);
Insert into areas (id, name, parent_id)
Values (9, 'US', 2);
Insert into areas (id, name, parent_id)
Values (10, 'Australia', 3);
Insert into areas (id, name, parent_id)
Values (11, 'New Zealand', 3);
create table places
(
id NUMBER not null,
name VARCHAR2(200) not null,
area_id NUMBER,
parent_id NUMBER
);
Insert into places (id, name, area_id, parent_id)
Values (1, 'London', 5, NULL);
Insert into places (id, name, area_id, parent_id)
Values (2, 'Bath', 5, NULL);
Insert into places (id, name, area_id, parent_id)
Values (3, 'Liverpool', 5, NULL);
Insert into places (id, name, area_id, parent_id)
Values (4, 'Paris', 7, NULL);
Insert into places (id, name, area_id, parent_id)
Values (5, 'New York', 9, NULL);
Insert into places (id, name, area_id, parent_id)
Values (6, 'Chicago', 9, NULL);
Insert into places (id, name, area_id, parent_id)
Values (7, 'Kings Cross', 5, 1);
Insert into places (id, name, area_id, parent_id)
Values (8, 'Tower of London', 5, 1);
I can query these tables independently like this:
SELECT a.*, level FROM areas a
start with parent_id is null
connect by prior id = parent_id
SELECT p.*, level FROM places p
start with parent_id is null
connect by prior id = parent_id
Is someone able to show me the last step to join these into one query with four levels? I've been working with Oracle for years but somehow this never came up!
If there was no connect by prior in the places table, just a list of cities with an area id, would this be easier?
Thank you
Is it what you need?
with src as (
select 'A' type, a.id, a.name, a.parent_id, null area_id from areas a
union all
select 'P', -p.id id, p.name, -p.parent_id parent_id, area_id from places p)
select
src.*, level
from
src
start with
type = 'A' and parent_id is null
connect by
parent_id = prior id or
parent_id is null and area_id = prior id
In SQL Server 2008 I have a table People (Id, Gender, Name).
Gender is either Male or Female. There can be many people with the same name.
I would like to write a query that displays for each gender the top 2 names
by count and their count, like this:
Male Female
Adam 23 Rose 34
Max 20 Jenny 15
I think that PIVOT might be used but all the examples I have seen display only one column for each header.
Here is an example on SQL Fiddle -- http://sqlfiddle.com/#!3/b3477/1
This uses an couple of common table expressions to separate the genders.
create table People
(
Id int,
Gender varchar(50),
Name varchar(50)
)
;
insert into People values (1, 'Male', 'Bob');
insert into People values (2, 'Male', 'Bob');
insert into People values (3, 'Male', 'Bill');
insert into People values (4, 'Male', 'Chuck');
insert into People values (5, 'Female', 'Anne');
insert into People values (6, 'Female', 'Anne');
insert into People values (7, 'Female', 'Bobbi');
insert into People values (8, 'Female', 'Jane');
with cteMale as
(
select Name as 'MaleName', Count(*) as Num, ROW_NUMBER() over(order by count(*) desc, Name) RowNum
from People
where Gender = 'Male'
group by Name
)
,
cteFemale as
(
select top 2 Name as 'FemaleName', Count(*) as Num, ROW_NUMBER() over(order by count(*) desc, Name) RowNum
from People
where Gender = 'Female'
group by Name
)
select a.MaleName, a.Num as MaleNum, b.femaleName, b.Num as FemaleNum
from cteMale a
join cteFemale b on
a.RowNum = b.RowNum
where a.RowNum <= 2
Use a windowing function. Below is a complete solution using a temporary table #people.
-- use temp db
use tempdb;
go
-- drop test table
--drop table #people;
--go
-- create test table
create table #people (my_id int, my_gender char(1), my_name varchar(25));
go
-- clear test table
delete from #people;
-- three count
insert into #people values
(23, 'M', 'Adam'),
(34, 'F', 'Rose');
go 3
-- two count
insert into #people values
(20, 'M', 'Max'),
(15, 'F', 'Jenny');
go 2
-- one count
insert into #people values
(20, 'M', 'John'),
(15, 'F', 'Julie');
go
-- grab top two by gender
;
with cte_Get_Top_Two as
(
select ROW_NUMBER() OVER(PARTITION BY my_gender ORDER BY count() DESC) AS my_window,
my_gender, my_name, count() as total
from #people
group by my_gender, my_name
)
select * from cte_Get_Top_Two where my_window in (1, 2)
go
Here is the output.
PS: You can drop my_id from the table since it does not relate to your problem but does not change solution.
I have been trying to move away from using DECODE to pivot rows in Oracle 11g, where there is a handy PIVOT function. But I may have found a limitation:
I'm trying to return 2 columns for each value in the base table. Something like:
SELECT somethingId, splitId1, splitName1, splitId2, splitName2
FROM (SELECT somethingId, splitId
FROM SOMETHING JOIN SPLIT ON ... )
PIVOT ( MAX(splitId) FOR displayOrder IN (1 AS splitId1, 2 AS splitId2),
MAX(splitName) FOR displayOrder IN (1 AS splitName1, 2 as splitName2)
)
I can do this with DECODE, but I can't wrestle the syntax to let me do it with PIVOT. Is this even possible? Seems like it wouldn't be too hard for the function to handle.
Edit: is StackOverflow maybe not the right Overflow for SQL questions?
Edit: anyone out there?
From oracle-developer.net it would appear that it can be done like this:
SELECT somethingId, splitId1, splitName1, splitId2, splitName2
FROM (SELECT somethingId, splitId
FROM SOMETHING JOIN SPLIT ON ... )
PIVOT ( MAX(splitId) ,
MAX(splitName)
FOR displayOrder IN (1 AS splitName1, 2 as splitName2)
)
I'm not sure from what you provided what the data looks or what exactly you would like. Perhaps if you posted the decode version of the query that returns the data you are looking for and/or the definition for the source data, we could better answer your question. Something like this would be helpful:
create table something (somethingId Number(3), displayOrder Number(3)
, splitID Number(3));
insert into something values (1, 1, 10);
insert into something values (2, 1, 11);
insert into something values (3, 1, 12);
insert into something values (4, 1, 13);
insert into something values (5, 2, 14);
insert into something values (6, 2, 15);
insert into something values (7, 2, 16);
create table split (SplitID Number(3), SplitName Varchar2(30));
insert into split values (10, 'Bob');
insert into split values (11, 'Carrie');
insert into split values (12, 'Alice');
insert into split values (13, 'Timothy');
insert into split values (14, 'Sue');
insert into split values (15, 'Peter');
insert into split values (16, 'Adam');
SELECT *
FROM (
SELECT somethingID, displayOrder, so.SplitID, sp.splitname
FROM SOMETHING so JOIN SPLIT sp ON so.splitID = sp.SplitID
)
PIVOT ( MAX(splitId) id, MAX(splitName) name
FOR (displayOrder, displayOrder) IN ((1, 1) AS split, (2, 2) as splitname)
);