There are two tables,
Table A
A_ID A_Field
1 blah1
2 blah2
3 blah3
........
============================================================
Table B (A_ID is foreign key references Table A's A_ID)
A_ID B_Field
1 a
1 b
1 c
2 a
2 b
2 c
What is the BEST way to get result like below:
A_ID A_Field B_Field
1 blah1 a,b,c
2 blah2 a,b,c
Thanks a lot for the replies, they all works, however, there is one more request, "For XML" dows NOT work on SQL SERVER 2000, unfortunately my domain service's DB is SQL Server 2000, is there a simple query work on SQL SERVER 2000?? Thanks!
Try something like (* Full Example* )
DECLARE #TableA TABLE(
A_ID INT,
A_Field VARCHAR(20)
)
INSERT INTO #TableA SELECT 1,'blah1'
INSERT INTO #TableA SELECT 2,'blah2'
INSERT INTO #TableA SELECT 3,'blah3'
DECLARE #TableB TABLE(
A_ID INT,
B_Field VARCHAR(20)
)
INSERT INTO #TableB SELECT 1,'a'
INSERT INTO #TableB SELECT 1,'b'
INSERT INTO #TableB SELECT 1,'c'
INSERT INTO #TableB SELECT 2,'a'
INSERT INTO #TableB SELECT 2,'b'
INSERT INTO #TableB SELECT 2,'c'
;WITH Vals AS (
SELECT a.A_ID,
a.A_Field,
b.B_Field
FROM #TableA a INNER JOIN
#TableB b ON a.A_ID = b.A_ID
)
SELECT p1.A_ID,
p1.A_Field
,STUFF(
(SELECT
', ' + p2.B_Field
FROM Vals p2
WHERE p2.A_ID=p1.A_ID
ORDER BY p2.A_ID
FOR XML PATH(''), TYPE
).value('.','varchar(max)')
,1,2, ''
) AS B_Field
FROM Vals p1
GROUP BY p1.A_ID,
p1.A_Field
Output
A_ID A_Field B_Field
1 blah1 a, b, c
2 blah2 a, b, c
"Best" is a relative term. I would probably use multiple queries and concatenate the string in code.
You can create a scalar UDF that takes A_ID as a parameter, and builds the denormalized string from table B. Your final SELECT would be:
SELECT A.A_ID, A.A_Field, dbo.myUDF(A.A_ID)
FROM A
To get the results as you are asking you need to join two tables. Here is an example:
SELECT A_ID, A_FIELD, B_FIELD
FROM Table A
LEFT JOIN Table B ON Table A.A_ID = Table B.A_ID
You would be using a group by function to concatenate the column B_Field values and you can refer to this post on help on cancatenating the strings
I don't know if it is the best way, but it works:
declare #rv table (a_id int, a_field varchar(50), b_field varchar(50))
insert into #rv (a_id, a_field) select a_id, a_field from a
declare #id int
declare #b varchar(50)
declare cur cursor for select a_id from #rv
open cur
fetch next from cur into #id
while ##fetch_status = 0 begin
set #b = ''
select #b = #b + ',' + b_field from b where a_id = #id
if len(#b) > 1 set #b = substring(#b, 2, len(#b)-1)
update #rv set b_field = #b where a_id = #id
fetch next from cur into #id
end
close cur
deallocate cur
select * from #rv
SELECT a.A_ID
, a.A_Field
, (SELECT CAST(b.B_Field+ ', ' AS VARCHAR(MAX))
FROM table_B b
WHERE (a.A_ID= b.A_ID)
FOR XML PATH ('')
)AS whatever FROM table_a a
This should work as you want. Cheers.
Try also this one
How to create a SQL Server function to "join" multiple rows from a subquery into a single delimited field?
Related
I need to replace the column value if exists to another column have a same text as like below example.
create table #t1
(
a varchar(100)
)
create table #t2
(
b varchar(100),
c varchar(100)
)
insert into #t1 values('she is a girl teacher and he is a boy doctor')
insert into #t2 values('girl','G')
insert into #t2 values('boy','B')
select *from #t1
select *from #t2
select a=replace (t1.a,t2.b,t2.c)
from #t1 t1 inner join #t2 t2 on t1.a like '%'+t2.b+'%'
while i'm selecting the query the result displays like
she is a G teacher and he is a boy doctor
she is a girl teacher and he is a B doctor
but i have need the output like
she is a G teacher and he is a B doctor
How need to change my query for the above output.
The only solution I can think if using recursive queries.
create table #t1
(
a varchar(100)
)
create table #t2
(
b varchar(100),
c varchar(100)
)
insert into #t1 values('she is a girl teacher and he is a boy doctor')
, ('she is a girl soldier and he is a boy doctor')
, ('she is a girl dentist and he is a boy farmer')
insert into #t2 values('girl','G')
insert into #t2 values('boy','B')
select *from #t1
select *from #t2
select a=replace(t1.a,t2.b,t2.c), *
from #t1 t1
inner join #t2 t2 on t1.a like '%'+t2.b+'%';
with cte as (
select a, 1 as ct from #t1
union all
select cast(replace(a,t2.b,t2.c) as varchar(100)) as a, ct+1 from cte
cross apply #t2 t2 where a like '%'+t2.b+'%'
)select distinct a from (select a, ct as ct from cte) as t1 where t1.ct = (select max(ct) from cte);
drop table #t1
drop table #t2
-- she is a G teacher and he is a B doctor
The most straightforward way is to just use a cursor to loop through all the replacements, applying them.
create table #t1
(
a varchar(100)
)
create table #t2
(
b varchar(100),
c varchar(100)
)
insert into #t1 values('she is a girl teacher and he is a boy doctor')
insert into #t2 values('girl','G')
insert into #t2 values('boy','B')
-- We create a couple of variables and a temporal table to hold the incremental replacements
declare #Pattern varchar(64)
declare #Value varchar(64)
select * into #TempReplacements from #1
-- Apply the replacements
declare Replacements cursor for select b, c from #t2
open Replacements
fetch next from Replacements into #Pattern, #Value
while ##fetch_status = 0
update #TempReplacements set a = replace(a, #Pattern, #Value)
fetch next from Replacements into #Pattern, #Value
end
close Replacements
deallocate Replacements
-- We return the results
select * from #TempRelacements
-- Drop temporary Table
drop table #TempReplacements
drop table #t1
drop table #t2
I have three tables. I called them as Table A,Table B,Table C.
And I have desired view which I want to get.
Table A
Aid RegNum BID Value
2CE7D0A7 2000000 D5981DFC OFFCRO
9D3C13AA 2000000 C58566C5 YCH - from
9DDB90C4 2000000 812E9E75 Y
Table B is connected to Table A by Table B's foreign key in Table A
Table B
BID Label ColumnName Order
D5981DFC Offered/Change Role StatusChangeCode 0
C58566C5 Offered/Role Change Comments StatusChangeComments 1
812E9E75 Assessed StatusChangeAssessed 2
Table C has foreign key in Table A as well. Reg Num. Reg num is primary key in Table C
Table C
Name Surname RegNum
Etibar Hasanov 2000000
As you see there are column's names which are datas in Table B
DesiredView
Name Surname RegNum StatusChangeCode StatusChangeComments StatusChangeAssessed
Etibar Hasanov 2000000 OFFCRO YCH - from Y
You can achieve this by using PIVOT table. Try something like this,
Create Table TableA(Aid varchar(50), RegNum int, BID Varchar(20), Value varchar(50))
insert into TableA values
('2CE7D0A7', 2000000, 'D5981DFC', 'OFFCRO'),
('9D3C13AA', 2000000, 'C58566C5', 'YCH - from' ),
('9DDB90C4', 2000000, '812E9E75', 'Y')
create Table TableB(BID Varchar(20), Label Varchar(50), ColumnName
Varchar(50), [Order] int)
insert into TableB values
('D5981DFC', 'Offered/Change Role', 'StatusChangeCode', 0),
('C58566C5', 'Offered/Role Change Comments', 'StatusChangeComments', 1),
('812E9E75', 'Assessed', 'StatusChangeAssessed', 2)
Create Table TableC (Name Varchar(20), Surname Varchar(20), RegNum int)
insert into TableC values
('Etibar', 'Hasanov', 2000000)
SELECT *
FROM (
SELECT
Name, SurName, C.RegNum, Value, B.ColumnName
FROM TableC C
JOIN TableA A ON C.RegNum = A.RegNum
JOIN TableB B on B.BID = A.BID
) AS Source
PIVOT
(
MAX(Value)
FOR [ColumnName]
in ( [StatusChangeCode], [StatusChangeComments], [StatusChangeAssessed] )
)AS Pvot
Sql Fiddle Demo
If you are using SQL server 2005, according to Microsoft Technet,
When PIVOT and UNPIVOT are used against databases that are upgraded to
SQL Server 2005 or later, the compatibility level of the database must
be set to 90 or higher.
I first selected columns names. In this table it brings [StatusChangeAssessed],[StatusChangeCode],[StatusChangeComments] . Then in the next query I setted #col ( column names ).
declare #nregnumber nvarchar(10)='2000000';
DECLARE #cols AS NVARCHAR(MAX), #runningquery as nvarchar(max);
select #cols = STUFF((SELECT distinct ',' + QUOTENAME(rn)
from
(
select columnname rn from tableb where exists ( select * from tablea where tablea.bid=tableb.bid and regnum=#nregnumber)
) t
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'');
set #runningquery='
SELECT *
FROM (
SELECT
Name, SurName, C.RegNum, Value, B.ColumnName
FROM TableC C
JOIN TableA A ON C.RegNum = A.RegNum
JOIN TableB B on B.BID = A.BID
) AS Source
PIVOT
(
MAX(Value)
FOR [ColumnName]
in ( '+#cols+')
)AS Pvot'
exec (#runningquery)
Special thanks to Selva.
I have a query that updates table records.
UPDATE #TEMP
SET [fld_LastName] = CustomerProfile.fld_LastName
,fld_FirstName = CustomerProfile.fld_FirstName
,fld_BirthDate = CustomerProfile.fld_BirthDate
FROM [DB_1].[dbo].[tbl_Customer] AS CustomerProfile --c
WHERE CustomerProfile.fld_CustomerNo = #TEMP.fld_CustomerNo
I want to update the records when the customer is not present in:
[DB_1].[dbo].[tbl_Customer]
I would want to look up to:
[DB_2].[dbo].[tbl_Customer]
How can i do that in an SQL Query?
Thanks a lot.
This should work for you:
UPDATE B
SET [fld_LastName] = CustomerProfile.fld_LastName
,fld_FirstName = CustomerProfile.fld_FirstName
,fld_BirthDate = CustomerProfile.fld_BirthDate
FROM [DB_1].[dbo].[tbl_Customer] AS CustomerProfile INNER JOIN #TEMP B
ON CustomerProfile.fld_CustomerNo = B.fld_CustomerNo
WHERE B.[fld_LastName] IS NULL OR B.fld_FirstName IS NULL OR B.fld_BirthDate IS NULL
You can do it with one update. Something like this:
DECLARE #a TABLE (id INT, val INT)
DECLARE #b TABLE (id INT, val INT)
DECLARE #c TABLE (id INT, val INT)
INSERT #a SELECT 1,NULL UNION SELECT 2,NULL UNION SELECT 3,30
INSERT #b SELECT 1,10
INSERT #c SELECT 1,20 UNION SELECT 2,20
SELECT * FROM #a
UPDATE #a
SET val = COALESCE(b.val,c.val,a.val)
FROM #a a
LEFT JOIN
#b b ON a.id=b.id
LEFT JOIN
#c c ON a.id=c.id
SELECT * FROM #a
This assumes that you prefer NOT NULL values from DB_2 to NULL values in DB_1--if those fields are even nullable.
UPDATE #TEMP
SET fld_LastName = COALESCE(b.fld_LastName,c.fld_LastName,a.fld_LastName)
,fld_FirstName = COALESCE(b.fld_FirstName,c.fld_FirstName,a.fld_FirstName)
,fld_BirthDate = COALESCE(b.fld_BirthDate,c.fld_BirthDate,a.fld_BirthDate)
FROM #Temp a
LEFT JOIN
DB_1.dbo.tbl_Customer b ON a.fld_CustomerNo = b.fld_CustomerNo
LEFT JOIN
DB_2.dbo.tbl_Customer c ON a.fld_CustomerNo = c.fld_CustomerNo
Hi I have a table which references itself and I need to be able to select the parent and all it's child records from a given parent Id.
My table is as follows:
ID | ParentID | Name
-----------------------
1 NULL A
2 1 B-1
3 1 B-2
4 2 C-1
5 2 C-2
So for the above example I'd like to be able to pass in a value of 1 and get all the records above.
So far, I've come up with the following recursive table-valued-function but it's not behaving as expected (only returning the first record).
CREATE FUNCTION [dbo].[SelectBranches]
(
#id INT
,#parentId INT
)
RETURNS #branchTable TABLE
(
ID INT
,ParentID INT
,Name INT
)
AS
BEGIN
IF #branchId IS NOT NULL BEGIN
INSERT INTO #branchTable
SELECT
ID
,ParentID
,Name
FROM
tblLinkAdvertiserCity
WHERE
ID = #id
END
INSERT INTO #branchTable
SELECT
br.ID
,br.ParentID
,br.Name
FROM
#branchTable b
CROSS APPLY
dbo.SelectBranches(NULL, b.ParentID) br
RETURN
END
GO
You can try this
DECLARE #Table TABLE(
ID INT,
ParentID INT,
NAME VARCHAR(20)
)
INSERT INTO #Table (ID,ParentID,[NAME]) SELECT 1, NULL, 'A'
INSERT INTO #Table (ID,ParentID,[NAME]) SELECT 2, 1, 'B-1'
INSERT INTO #Table (ID,ParentID,[NAME]) SELECT 3, 1, 'B-2'
INSERT INTO #Table (ID,ParentID,[NAME]) SELECT 4, 2, 'C-1'
INSERT INTO #Table (ID,ParentID,[NAME]) SELECT 5, 2, 'C-2'
DECLARE #ID INT
SELECT #ID = 2
;WITH ret AS(
SELECT *
FROM #Table
WHERE ID = #ID
UNION ALL
SELECT t.*
FROM #Table t INNER JOIN
ret r ON t.ParentID = r.ID
)
SELECT *
FROM ret
Recursion in CTE looks bit expensive, so I have wrote this function which make use of recursive function call but much faster that CTE recursion.
CREATE FUNCTION [dbo].[Fn_GetSubCategories]
(
#p_ParentCategoryId INT
) RETURNS #ResultTable TABLE
(
Id INT
)
AS
BEGIN
--Insert first level subcategories.
INSERT INTO #ResultTable
SELECT Id FROM Category WHERE ParentCategoryId = #p_ParentCategoryId OR Id = #p_ParentCategoryId
DECLARE #Id INT
DECLARE #ParentCategory TABLE(Id INT)
DECLARE cur_categories CURSOR
LOCAL STATIC READ_ONLY FORWARD_ONLY FOR
SELECT Id FROM Category WHERE ParentCategoryId = #p_ParentCategoryId and Id != #p_ParentCategoryId
OPEN cur_categories
IF ##CURSOR_ROWS > 0
BEGIN
FETCH NEXT FROM cur_categories INTO #Id
WHILE ##FETCH_STATUS = 0
BEGIN
--Insert remaining level sub categories.
IF EXISTS(SELECT 1 FROM Category WHERE ParentCategoryId = #Id AND Id != #Id)
BEGIN
INSERT INTO #ResultTable
SELECT DISTINCT C.Id from Fn_GetSubCategories(#Id) C INNER JOIN #ResultTable R ON C.Id != R.Id
END
FETCH NEXT FROM cur_categories INTO #Id
END
--Delete duplicate records
;WITH CTE AS
(SELECT *,ROW_NUMBER() OVER (PARTITION BY Id ORDER BY Id) AS RN FROM #ResultTable)
DELETE FROM CTE WHERE RN<>1
END
CLOSE cur_categories
DEALLOCATE cur_categories
RETURN
END
Unless you are using Oracle, your table structure is not suitable for the problem described. What you are attempting to do is grab a hierarchy (traversing a tree structure).
There is an article, More Trees & Hierarchies in SQL, that describes one method of solving the hierarchy problem. He basically adds a "lineage" column describing the hierarchy to every row.
How do I Delete duplicated rows in one Table and update References in another table to the remaining row? The duplication only occurs in the name. The Id Columns are Identity columns.
Example:
Assume we have two tables Doubles and Data.
Doubles table (
Id int,
Name varchar(50)
)
Data Table (
Id int,
DoublesId int
)
Now I Have Two entries in the Doubls table:
Id Name
1 Foo
2 Foo
And two entries in the Data Table:
ID DoublesId
1 1
2 2
At the end there should be only one entry in the Doubles Table:
Id Name
1 Foo
And two entries in the Data Table:
Id DoublesId
1 1
2 1
In the doubles Table there can be any number of duplicated rows per name (up to 30) and also regular 'single' rows.
I've not run this, but hopefully it should be correct, and close enough to the final soln to get you there. Let me know any mistakes if you like and I'll update the answer.
--updates the data table to the min ids for each name
update Data
set id = final_id
from
Data
join
Doubles
on Doubles.id = Data.id
join
(
select
name
min(id) as final_id
from Doubles
group by name
) min_ids
on min_ids.name = Doubles.name
--deletes redundant ids from the Doubles table
delete
from Doubles
where id not in
(
select
min(id) as final_id
from Doubles
group by name
)
Note: I have taken the liberty to rename your Id's to DoubleID and DataID respectively. I find that eassier to work with.
DECLARE #Doubles TABLE (DoubleID INT, Name VARCHAR(50))
DECLARE #Data TABLE (DataID INT, DoubleID INT)
INSERT INTO #Doubles VALUES (1, 'Foo')
INSERT INTO #Doubles VALUES (2, 'Foo')
INSERT INTO #Doubles VALUES (3, 'Bar')
INSERT INTO #Doubles VALUES (4, 'Bar')
INSERT INTO #Data VALUES (1, 1)
INSERT INTO #Data VALUES (1, 2)
INSERT INTO #Data VALUES (1, 3)
INSERT INTO #Data VALUES (1, 4)
SELECT * FROM #Doubles
SELECT * FROM #Data
UPDATE #Data
SET DoubleID = MinDoubleID
FROM #Data dt
INNER JOIN #Doubles db ON db.DoubleID = dt.DoubleID
INNER JOIN (
SELECT db.Name, MinDoubleID = MIN(db.DoubleID)
FROM #Doubles db
GROUP BY db.Name
) dbmin ON dbmin.Name = db.Name
/* Kudos to quassnoi */
;WITH q AS (
SELECT Name, ROW_NUMBER() OVER (PARTITION BY Name ORDER BY Name) AS rn
FROM #Doubles
)
DELETE
FROM q
WHERE rn > 1
SELECT * FROM #Doubles
SELECT * FROM #Data
Take a look at this one, i have tried this, working fine
--create table Doubles ( Id int, Name varchar(50))
--create table Data( Id int, DoublesId int)
--select * from doubles
--select * from data
Declare #NonDuplicateID int
Declare #NonDuplicateName varchar(max)
DECLARE #sqlQuery nvarchar(max)
DECLARE DeleteDuplicate CURSOR FOR
SELECT Max(id),name AS SingleID FROM Doubles
GROUP BY [NAME]
OPEN DeleteDuplicate
FETCH NEXT FROM DeleteDuplicate INTO #NonDuplicateID, #NonDuplicateName
--Fetch next record
WHILE ##FETCH_STATUS = 0
BEGIN
--select b.ID , b.DoublesID, a.[name],a.id asdasd
--from doubles a inner join data b
--on
--a.ID=b.DoublesID
--where b.DoublesID<>#NonDuplicateID
--and a.[name]=#NonDuplicateName
print '---------------------------------------------';
select
#sqlQuery =
'update b
set b.DoublesID=' + cast(#NonDuplicateID as varchar(50)) + '
from
doubles a
inner join
data b
on
a.ID=b.DoublesID
where b.DoublesID<>' + cast(#NonDuplicateID as varchar(50)) +
' and a.[name]=''' + cast(#NonDuplicateName as varchar(max)) +'''';
print #sqlQuery
exec sp_executeSQL #sqlQuery
print '---------------------------------------------';
-- now move the cursor
FETCH NEXT FROM DeleteDuplicate INTO #NonDuplicateID ,#NonDuplicateName
END
CLOSE DeleteDuplicate --Close cursor
DEALLOCATE DeleteDuplicate --Deallocate cursor
---- Delete duplicate rows from original table
DELETE
FROM doubles
WHERE ID NOT IN
(
SELECT MAX(ID)
FROM doubles
GROUP BY [NAME]
)
Please try and let me know if this helped you
Thanks
~ Aamod
If you are using MYSQL following worked for me. I did it for 2 steps
Step 1 -> Update all Data rows to one Double table reference (with lowest id)
Step 2 -> Delete all duplicates with keeping lowest id
Step 1 ->
update Data
join
Doubles
on Data.DoublesId = Doubles.id
join
(
select name, min(id) as final_id
from Doubles
group by name
) min_ids
on min_ids.name = Doubles.name
set DoublesId = min_ids.final_id;
Step 2 ->
DELETE c1 FROM Doubles c1
INNER JOIN Doubles c2
WHERE
c1.id > c2.id AND
c1.name = c2.name;