I have 2 temp Tables [Description] and [Institution], I want to have these two in one table.
They are both tables that look like this:
Table1; #T1
|Description|
blabla
blahblah
blagblag
Table2; #T2
|Institution|
Inst1
Inst2
Inst3
I want to get it like this:
Table3; #T3
|Description| |Institution|
blabla Inst1
blahblah Inst2
blagblag Inst3
They are already in sort order.
I just need to get them next to each other..
Last time I asked was something almost the same.
I used this query
Create Table #T3
(
[From] Datetime
,[To] Datetime
)
INSERT INTO #T3
SELECT #T1.[From]
, MIN(#T2.[To])
FROM #T1
JOIN #T2 ON #T1.[From] < #T2.[To]
GROUP BY #T1.[From]
Select * from #T3
It did work for the date values, but it won't work here ? :s
Thank you.
One thing that concerns me is that you say that the values "are already in sort order". There really is no default sort order -- if you don't specify a sort order, you are at the mercy of SQL Server to determine the order in which the data is returned. The solution below assumes that there is some way to sort the data such that the records "match up" (using the ORDER BY clauses).
Hope this helps,
John
-- Table 1 test data
Create Table #T1
(
[Description] nvarchar(30)
)
INSERT INTO #T1 ([Description]) VALUES ('desc1')
INSERT INTO #T1 ([Description]) VALUES ('desc2')
INSERT INTO #T1 ([Description]) VALUES ('desc3')
-- Table 2 test data
Create Table #T2
(
[Institution] nvarchar(30)
)
INSERT INTO #T2 (Institution) VALUES ('Inst1')
INSERT INTO #T2 (Institution) VALUES ('Inst2')
INSERT INTO #T2 (Institution) VALUES ('Inst3')
-- Create table 3
Create Table #T3
(
[Description] nvarchar(30),
[Institution] nvarchar(30)
);
-- Use CTE2 to add row numbers to the data; use the row numbers to join the tables
-- you must specify the sort order for the data in the tables
WITH CTE1 (Description, RowNum) AS
(
SELECT [Description], ROW_NUMBER() OVER(ORDER BY [Description]) as RowNum
FROM #T1
),
CTE2 (Institution, RowNum) AS
(
SELECT Institution, ROW_NUMBER() OVER(ORDER BY Institution) as RowNum
FROM #T2
)
INSERT INTO #T3
SELECT CTE1.Description, CTE2.Institution
FROM CTE1
LEFT JOIN CTE2 ON CTE1.RowNum = CTE2.RowNum
Select * from #T3
Related
I have a table of kicks between a number of football players. Most interactions have both a kicker and receiver, but sometimes the pass is made but never received. The table contains 3 columns. For purposes of the example, I have added a "PassID" column to assist with the description of the problem.
The table looks as follows:
create table #T (Player1 varchar(25),Action varchar(25),Player2 varchar(25),PassID int)
insert into #T select 'Jamie','Kicked to','Pierre',1
insert into #T select 'Pierre','Received from ','Jamie',1
insert into #T select 'Jamie','Kicked to ','Mohamed',2
insert into #T select 'Jamie','Received from ','Kun',3
insert into #T select 'Kun ','Kicked to','Jamie',3
insert into #T select 'Mohamed','Received from ','Pierre',4
insert into #T select 'Pierre','Kicked to','Mohamed',4
insert into #T select 'Mohamed','Kicked to','Kun',5
insert into #T select 'Jamie ','Kicked to ','Kun',6
insert into #T select 'Kun ','Received from ','Jamie',6
insert into #T select 'Jamie','Received from ','Kun',7
insert into #T select 'Kun ','Kicked to','Jamie',7
I have to answer the following question using SQL server:
How many unique interactions exist, where a unique interaction is defined as a kick between two players, whether completed or not and where the direction of the interaction does not matter?
In this simple example, I know the answer is 5,being:
Jamie/Pierre
Jamie/Mohamed
Jamie/Kun
Mohamed/Pierre
Mohamed/Kun
How do I extract this answer from the table using T-SQL statement?
SELECT COUNT(DISTINCT CASE
WHEN Player1 > Player2 THEN CONCAT(Player1,'+',Player2)
ELSE CONCAT(Player2,'+',Player1)
END )
FROM #T
WHERE Action = 'Kicked To';
Here is a SQL Fiddle
Try with the below code.
Select CONCAT(x.Player1,'/',x.Player2)Title from (
Select *,ROW_NUMBER() over (PARTITION by passid order by passid)Row from #T
)X
where Row=1
Tables have been created and used without and ID column, but ID column is now needed. (classic)
I heard everything could be done without cursors. I just need every row to contain a different int value so I was looking for some kind of row number function :
How do I use ROW_NUMBER()?
I can't tell exactly how to use it even with these exemples.
UPDATE [TableA]
SET [id] = (select ROW_NUMBER() over (order by id) from [TableA])
Subquery returned more than 1 value.
So... yes of course it return more than one value. Then how to mix both update and row number to get that column filled ?
PS. I don't need a precise order, just unique values. I also wonder if ROW_NUMBER() is appropriate in this situation...
You can use a CTE for the update
Example
Declare #TableA table (ID int,SomeCol varchar(50))
Insert Into #TableA values
(null,'Dog')
,(null,'Cat')
,(null,'Monkey')
;with cte as (
Select *
,RN = Row_Number() over(Order by (Select null))
From #TableA
)
Update cte set ID=RN
Select * from #TableA
Updated Table
ID SomeCol
1 Dog
2 Cat
3 Monkey
You can use a subquery too as
Declare #TableA table (ID int,SomeCol varchar(50))
Insert Into #TableA values
(null,'Dog')
,(null,'Cat')
,(null,'Monkey');
UPDATE T1
SET T1.ID = T2.RN
FROM #TableA T1 JOIN
(
SELECT ROW_NUMBER()OVER(ORDER BY (SELECT 1)) RN,
*
FROM #TableA
) T2
ON T1.SomeCol = T2.SomeCol;
Select * from #TableA
The first column of a table is the date.
I need to sort the rest of the data while actually updating the table according to date (descending). I can't use UPDATE and ORDER BY together.
I tried using something similar to this post:
UPDATE Test
SET Number = rowNumber
FROM Test
INNER JOIN
(SELECT ID, row_number() OVER (ORDER BY ID DESC) as rowNumber
FROM Test) drRowNumbers ON drRowNumbers.ID = Test.ID
in
SQL Server: UPDATE a table by using ORDER BY
But I cannot mix row_number and date.
Any help will be appreciated.
Use a CTE:
Check it here: http://rextester.com/NGTM78965
create table #t1 (id int, d datetime, rown int);
insert into #t1 values (1,'2016-05-01',0);
insert into #t1 values (2,'2016-05-04',0);
insert into #t1 values (3,'2016-06-01',0);
insert into #t1 values (4,'2016-04-03',0);
insert into #t1 values (5,'2016-05-12',0);
insert into #t1 values (6,'2016-08-01',0);
insert into #t1 values (7,'2016-05-15',0);
insert into #t1 values (8,'2016-05-25',0);
with cte (id, d, r) as
(
select id, d, row_number() over (order by d) r
from #t1
)
update #t1
set #t1.rown = cte.r
from cte inner join #t1 on #t1.id = cte.id;
select * from #t1 order by d
This question already has answers here:
How can I remove duplicate rows?
(43 answers)
Closed 9 years ago.
I have a table called table1 which has duplicate values. It looks like this:
new
pen
book
pen
like
book
book
pen
but I want to remove the duplicated rows from that table and insert them into another table called table2.
table2 should look like this:
new
pen
book
like
How can I do this in SQL Server?
Let's assume the field was named name:
INSERT INTO table2 (name)
SELECT name FROM table1 GROUP BY name
that query would get you all the unique names.
You could even put them into a table variable if you wanted:
DECLARE #Table2 TABLE (name VARCHAR(50))
INSERT INTO #Table2 (name)
SELECT name FROM table1 GROUP BY name
or you could use a temp table:
CREATE TABLE #Table2 (name VARCHAR(50))
INSERT INTO #Table2 (name)
SELECT name FROM table1 GROUP BY name
You can do this easily with a INSERT that SELECTs from a CTE where you use ROW_NUMBER(), like:
DECLARE #YourTable table (YourColumn varchar(10))
DECLARE #YourTable2 table (YourColumn varchar(10))
INSERT INTO #YourTable VALUES ('new')
INSERT INTO #YourTable VALUES ('pen')
INSERT INTO #YourTable VALUES ('book')
INSERT INTO #YourTable VALUES ('pen')
INSERT INTO #YourTable VALUES ('like')
INSERT INTO #YourTable VALUES ('book')
INSERT INTO #YourTable VALUES ('book')
INSERT INTO #YourTable VALUES ('pen')
;WITH OrderedResults AS
(
SELECT
YourColumn, ROW_NUMBER() OVER (PARTITION BY YourColumn ORDER BY YourColumn) AS RowNumber
FROM #YourTable
)
INSERT INTO #YourTable2
(YourColumn)
SELECT YourColumn FROM OrderedResults
WHERE RowNumber=1
SELECT * FROM #YourTable2
OUTPUT:
YourColumn
----------
book
like
new
pen
(4 row(s) affected)
You can do this easily with a DELETE on a CTE where you use ROW_NUMBER(), like:
--this will just remove them from your original table
DECLARE #YourTable table (YourColumn varchar(10))
INSERT INTO #YourTable VALUES ('new')
INSERT INTO #YourTable VALUES ('pen')
INSERT INTO #YourTable VALUES ('book')
INSERT INTO #YourTable VALUES ('pen')
INSERT INTO #YourTable VALUES ('like')
INSERT INTO #YourTable VALUES ('book')
INSERT INTO #YourTable VALUES ('book')
INSERT INTO #YourTable VALUES ('pen')
;WITH OrderedResults AS
(
SELECT
YourColumn, ROW_NUMBER() OVER (PARTITION BY YourColumn ORDER BY YourColumn) AS RowNumber
FROM #YourTable
)
DELETE OrderedResults
WHERE RowNumber!=1
SELECT * FROM #YourTable
OUTPUT:
YourColumn
----------
new
pen
book
like
(4 row(s) affected)
I posted something on deleting duplicates a couple of weeks ago by using DELETE TOP X. Only for a single set of duplicates obviously. However in the comments I was given this little jewel by Joshua Patchak.
;WITH cte(rowNumber) AS
(SELECT ROW_NUMBER() OVER (PARTITION BY [List of Natural Key Fields]
ORDER BY [List of Order By Fields])
FROM dbo.TableName)
DELETE FROM cte WHERE rowNumber>1
This will get rid of all of the duplicates in the table.
Here is the original post if you want to read the discussion. Duplicate rows in a table.
I need a SQL statement which fills the null values from the second column of #T1 table with values from #T2(C1).
There is no foreign key or match between the columns of those two tables.
Sample:
T1 (C1, T2C1)
A1, 1
A2, null
A3, null
A4, 4
A5, null
-------------
T2 (C1)
a
b
After update, the T1 will look like:
A1, 1
A2, a
A3, b
A4, 4
A5, null
I found two approaches:
Using CTE
create table #T1 (C1 varchar(10), T2C1 varchar(10))
create table #T2 (C1 varchar(10))
insert into #T1 values ('A1', '1')
insert into #T1 values ('A2', null)
insert into #T1 values ('A3', null)
insert into #T1 values ('A4', '4')
insert into #T1 values ('A5', null)
insert into #T2 values ('a')
insert into #T2 values ('b')
;with t2 as
(
select C1, row_number() over (order by C1) as Index2
from #T2
)
,t1 as
(
select T2C1, row_number() over (order by C1) as Index1
from #T1
where T2C1 is null
)
update t1
set t1.T2C1 = t2.C1
from t2
where t1.Index1 = t2.Index2
select * from #T1
drop table #T1
drop table #T2
With Derived Tables
create table #T1 (C1 varchar(10), T2C1 varchar(10))
create table #T2 (C1 varchar(10))
insert into #T1 values ('A1', '1')
insert into #T1 values ('A2', null)
insert into #T1 values ('A3', null)
insert into #T1 values ('A4', '4')
insert into #T1 values ('A5', null)
insert into #T2 values ('a')
insert into #T2 values ('b')
update #T1
set T2C1 = cj.C1
from #T1
join (select T2C1, row_number() over (order by C1) as Index1, C1
from #T1
where T2C1 is null) ci on ci.C1 = #T1.C1
join (select C1, row_number() over (order by C1) as Index2
from #T2) cj on ci.Index1 = cj.Index2
select * from #T1
drop table #T1
drop table #T2
My question is, can I achieve this without using windowing functions and with no cursors?
Update
#Damien_The_Unbeliever correctly points that to do this kind of update it is not possible without defining an ordering on tables, actually I think exactly said is without properly identify and link the rows from target table.
#Bogdan Sahlean has found another way, using table variables and IDENTITY column, which I'm happy with this solution, it's another way
However, in the real application I will still use the windowing functions
Thanks all
1.I suppose you have a pk in target table (#T1).
2.Instead of ROW_NUMBER this solution uses IDENTITY(1,1) columns and two table variables.
3.I didn't tested this solution.
DECLARE #t2_count INT = (SELECT COUNT(*) FROM #T2);
DECLARE #Target TABLE
(
MyId INT IDENTITY(1,1) PRIMARY KEY
,T1_pk INT NOT NULL UNIQUE
);
INSERT #Target (T1_pk)
SELECT TOP(#t2_count) pk
FROM #T1
WHERE T2C1 IS NULL;
DECLARE #Source TABLE
(
MyId INT IDENTITY(1,1) PRIMARY KEY
,C1 VARCHAR(10) NOT NULL
);
INSERT #Source (C1)
SELECT C1
FROM #T2;
UPDATE #T1
SET T2C1 = src.C1
FROM #T1 t
INNER JOIN #Target trg ON t.pk = trg.T1_pk
INNER JOIN #Source src ON trg.MyId = src.MyId;
I agree with Damien, anyway when you will rely on the engine and make a premise that the table is ordered by the C1 column (which depends only on the DB and you can not rely on that ) the you could issue an update statement which will update all the rows
declare #a int
set #a = 0
update #t1
set t2c1 = #a,
#a = #a+1
But I wouldn't do that.
I would use a CTE along with ROW_NUMBER:
WITH cte_t1 AS
(
SELECT
T2C1
,ROW_NUMBER() OVER (ORDER BY C1) AS id
FROM T1
WHERE T2C1 IS NULL
)
,cte_t2 AS
(
SELECT
C1
,ROW_NUMBER() OVER (ORDER BY C1) AS id
FROM T2
)
UPDATE t1
SET t1.T2C1 = t2.C1
FROM cte_t1 AS t1
INNER JOIN cte_t2 AS t2
ON t1.id = t2.id
;
The ROW_NUMBER creates an identifier based on the order the columns are in (which I am assuming is what you are looking for, but note that SQL does not have an order instead this query is relying on the physical order of the records which is not a good idea but it looks like that is what you are dealing with). We then join on this identifier and update the records in T1 with the values in T2.
I have placed this solution on SQL Fiddle.
If you can look into create new tables with some type of identifier that links them together, then you would not have to rely on the physical order of the records.