I have table with 3 columns (id, Name, Occurrence), I want to update the Occurrence column ,based on the id column, attached snap for the reference.
for example if my id column has "606" value 3 times then my occurrent column should have 3 against all the "606" value.
Below is the method which I tried.
I tried to find the duplicate values using group by and Having clause and saved it in a temp table and from there I tried to join the table value from the temp table.
you can use window functions in an updatable CTE for this.
You haven't supplied any actual sample data so this is untested, however the following should work:
with x as (
select Id, Occurence, count(*) over(partition by Id) qty
from Table
)
update x
set Occurence = Qty;
You can go for GROUP BY based approach also.
declare #TABLE TABLE(ID INT, NAME CHAR(3), occurance int null)
insert into #TABLE VALUES
(1,'AAA',NULL),(1,'AAA',NULL),(2,'CCC',NULL),(3,'DDD',NULL), (3,'DDD',NULL),(4,'EEE',NULL),(5,'FFF',NULL);
;WITH CTE_Table as
(
SELECT ID, COUNT(*) AS Occurance
FROM #table
group by id
)
UPDATE t
SET occurance = c.occurance
FROM #table t
INNER JOIN CTE_Table as c
on C.ID = T.ID
SELECT * FROM #TABLE
ID
NAME
occurance
1
AAA
2
1
AAA
2
2
CCC
1
3
DDD
2
3
DDD
2
4
EEE
1
5
FFF
1
You can use a CTE and calculate row number and update your table base on CTE
;WITH q
AS
(
SELECT Id,COUNT(1) 'RowNum'
FROM YourTable
GROUP BY Id
)
UPDATE YourTable
SET Occurrence=q.RowNum
FROM YourTable t
INNER JOIN q
ON t.Id=q.Id
Related
I have 2 tables, the first one has 10 distinct values:
,
each GlobalPnID has many values on the second table, I want to join 2 tables and select one random value of PortionKey of the second table that match the condition and move to the next GlobalPnID
SELECT TOP 10 gpnp.PortionKey, tt.GlobalPnID
from #TempTable tt
LEFT JOIN [dbo].[GlobalPartNumberPortions] gpnp ON gpnp.GlobalPnId = tt.GlobalPnID
-- tt is the first table
-- gpnp is the second
SELECT TT.GlobalPnID,X.PortionKey
FROM #TempTable AS TT
CROSS APPLY
(
SELECT TOP 1 R.PortionKey
FROM [dbo].[GlobalPartNumberPortions] AS R
WHERE R.GlobalPnId=TT.GlobalPnID
ORDER BY R.PortionID
)X
You could use Row_Number with a CTE and set the criteria you want, for example:
DECLARE #TempTable TABLE
(
globalpnid INT
)
DECLARE #GlobalPartNumberPortions TABLE
(
portionid INT,
portionkey NVARCHAR(10),
globalpnid INT
)
INSERT INTO #TempTable
(globalpnid)
VALUES (1),(2),(3),(4)
INSERT INTO #GlobalPartNumberPortions
(portionid,
portionkey,
globalpnid)
VALUES (1,'ABC',1),
(2,'XYZ',1),
(3,'AZZ',2),
(4,'QWE',3),
(5,'TYU',4);
WITH cteportion
AS (SELECT portionkey,
globalpnid,
rn = Row_number()
OVER (
partition BY globalpnid
ORDER BY RAND(CHECKSUM(NEWID()))))
FROM #GlobalPartNumberPortions)
SELECT gpnp.portionkey,
tt.globalpnid
FROM #TempTable tt
LEFT JOIN cteportion gpnp
ON tt.globalpnid = gpnp.globalpnid
AND gpnp.rn = 1
This will partition the second table by the globalpnid ordering on ORDER BY RAND(CHECKSUM(NEWID()))) and you can then use this in the join gpnp.rn = 1. In the example I've included, you'll see that GlobalPnID = 1 will alternate between ABC and XYZ.
Edit: as suggested by #Thorsten Kettner in the comment, you can order by RAND(CHECKSUM(NEWID())))
If I have a table like this:
id name value
1 abc 1
2 def 4
3 ghi 1
4 jkl 2
How can I select a new table that still has id, name, value but only the ones with a minimum value.
In this example I need this table back:
1 abc 1
3 ghi 1
Finding those values is pretty straightforward:
SELECT *
FROM YourTable
WHERE value = (SELECT MIN(Value) FROM YourTable);
As for the right syntax for putting those rows in another table, that will depend on the database engine that you are using.
An alternative to #Lamak's solution could be to use the rank window function. Depending on the exact scenario, it may perform quite better:
SELECT id, name, value
FROM (SELECT id, name, value, RANK() OVER (ORDER BY value ASC) AS rk
FROM mytable) t
WHERE rk = 1
not sure exactly if this is what you're trying to do, but I think this would work:
--creating #temp1 to recreate your table/example
CREATE TABLE #TEMP1
(id INT NOT NULL PRIMARY KEY,
name CHAR(3) NOT NULL,
value INT NOT NULL)
INSERT INTO #TEMP1
VALUES
(1,'abc',1),
(2,'def',4),
(3,'ghi',1),
(4,'jkl',2)
-verify correct
SELECT * FROM #temp1
--populate new table with min value from table 1
SELECT *
INTO #TEMP2
FROM #TEMP1
WHERE value = (SELECT MIN(value)
FROM #TEMP1)
SELECT * FROM #TEMP2
I have a set of data as below
number quantity
1 4
2 6
3 7
4 9
2 1
1 2
5 4
I need to find the unique value in the column "number"
The output should look like this:
number quantity
3 7
4 9
5 4
Any help would be appreciated. I am using MS SQL
In the inner query get all the distinct numbers, then join with again with the main table to get your expected results.
select o.*
from mytable o , (select number
from mytable
group by number) dist
where o.number = dist.number
One way to go could be to have an aggregate query that counts the number of occurrences for each number use it in a subquery:
SELECT number, quantity
FROM my_table
WHERE number IN (SELECT number
FROM my_table
GROUP BY number
HAVING COUNT(*) = 1)
If your column name is my_column in table my_table, the query is:
SELECT my_column, COUNT(*) as count
FROM my_table
GROUP BY my_column
HAVING COUNT(*) > 1
This will return all records that have duplicate my_column content, as well as how many times this content occurs in the database.
you can use below code for desire output:
SELECT DISTINCT(my_column), COUNT(*) as count
FROM my_table
GROUP BY my_column
Try this :
SELECT *
FROM yourtable t1
WHERE (SELECT Count(*)
FROM yourtable t2
WHERE t1.number = t2.number) = 1
Query in where clause will return number of occurrences of each number and checking it with 1 will return only those rows will have only one occurrence in table.
You can probably use ROW_NUMBER() analytic function like
select * from
(
select number,
quantity,
ROW_NUMBER() OVER(PARTITION BY number ORDER BY number) AS rn
from table1
) tab where rn = 1;
Try this:
create table #TableName(number int, quantity int)
insert into #TableName values(1, 2)
insert into #TableName values(1, 4)
insert into #TableName values(2, 4)
SELECT number, quantity
FROM #TableName
WHERE number
IN(SELECT number
FROM #TableName
GROUP BY number
HAVING COUNT(NUMBER) = 1)
I need to create a recursive update statement that updates from another table so for ex..
Table1
(
IdNumberGeneratedFromAService INT NOT NULL,
CodeName NVARCHAR(MAX)
)
Table2
(
Table2Id Auto_Increment,
Name NVARCHAR(MAX),
IdNumberThatComesFromTabl1,
CodeNameForTable1ToMatch
)
the issue is CodeNameForTable1ToMatch is not unique so if Table1 has 2 idnumber for the same code and there are two rows in Table2 with the same CodeName I want to update the rows in table2 in sequence so first row gets the first idnumber and second row gets the second id number.
Also want to do it without cursor....
SAMPLE DATA
Table1
idNumber Code
C145-6678-90 Code1
C145-6678-91 Code1
C145-6678-92 Code1
C145-6678-93 Code1
C145-6678-94 Code1
Table 2
AutoIncrementIdNumber Code IdNumber
1 Code1 {NULL}
2 Code1 {NULL}
3 Code1 {NULL}
4 Code1 {NULL}
5 Code1 {NULL}
C145-6678-90 needs to got 1
C145-6678-91 needs to got 2
C145-6678-92 needs to got 3
C145-6678-93 needs to got 4
C145-6678-94 needs to got 5
in one update statement
Using the ROW_NUMBER windowing function on each of the tables, partitioned by the code, you can number each of the rows that have a code in common, then combine the results of that on each query to match rows based on the code and the numbered instance of that code. So the first Code A in Table 1 would matched the first Code A in table 2, and etc.
Sample code showing this (SQL 2005 or higher):
-- Sample code prep
CREATE TABLE #Table1
(
IdNumberGeneratedFromAService INT NOT NULL,
CodeName NVARCHAR(MAX)
);
CREATE TABLE #Table2
(
Table2Id INT NOT NULL IDENTITY(1,1),
Name NVARCHAR(MAX),
IdNumberThatComesFromTabl1 INT NULL,
CodeNameForTable1ToMatch NVARCHAR(MAX)
);
INSERT INTO #Table1(IdNumberGeneratedFromAService, CodeName)
VALUES(100,'Code A'),(150,'Code A'),(200,'Code B'),(250,'Code A'),(300,'Code C'),(400,'Nonexistent');
INSERT INTO #Table2(Name, IdNumberThatComesFromTabl1, CodeNameForTable1ToMatch)
VALUES('A1-100',0,'Code A'),('A2-150',0,'Code A'),('A3-250',0,'Code A'),('B1-200',0,'Code B'),('C1-300',0,'Code C'),('No Id For Me',0,'Code No Id :(');
-- Sample select statement that shows the row numbers
--SELECT *
--FROM
-- (SELECT *, ROW_NUMBER() OVER (Partition By IT2.CodeNameForTable1ToMatch Order By IT2.Table2Id) as RowNum
-- FROM #Table2 IT2) T2
-- INNER JOIN
-- (SELECT *, ROW_NUMBER() OVER (Partition By IT1.CodeName Order By IT1.IdNumberGeneratedFromAService) as RowNum
-- FROM #Table1 IT1) T1
-- ON T1.CodeName = T2.CodeNameForTable1ToMatch AND T1.RowNum = T2.RowNum;
-- Table 2 Before
SELECT * FROM #Table2;
-- Actual update statement
UPDATE #Table2
SET IdNumberThatComesFromTabl1 = T1.IdNumberGeneratedFromAService
FROM #Table2 AT2
INNER JOIN
(SELECT *, ROW_NUMBER() OVER (Partition By IT2.CodeNameForTable1ToMatch Order By IT2.IdNumberThatComesFromTabl1) as RowNum
FROM #Table2 IT2) T2
ON T2.Table2Id = AT2.Table2Id
INNER JOIN
(SELECT *, ROW_NUMBER() OVER (Partition By IT1.CodeName Order By IT1.IdNumberGeneratedFromAService) as RowNum
FROM #Table1 IT1) T1
ON T1.CodeName = T2.CodeNameForTable1ToMatch AND T1.RowNum = T2.RowNum;
-- Table 2 after
SELECT * FROM #Table2;
-- Cleanup
DROP TABLE #Table1;
DROP TABLE #Table2;
I turned your two sample tables into temp tables and added 3 records for 'Code A', a record for 'Code B', and a record for 'Code C'. The codes in table1 are numbered based on the order of the table 1 ID, the codes in Table 2 are ordered by the auto-incrementing Table 2 id. I also included a record in each table that wouldn't have a match in the other. I tried to make the code's descriptive so it would be easier to see that a correct match has occurred (they order for table 2 is important since it has an auto incrementing id)
The commented out sample select is there to help understand how the select works before I join it into the UPDATE statement.
So we can see before the update Table 2 is all 0's, then we update the values in table 2 where the unique table 2 id matches the unique table 2 id from our nicely numbered and matched join, then we select from table 2 again to see the results.
A riff on Tarwn's solution:
with cte1 as (
select code, row_number() over (partition by code order by idNumber) as [rn]
from table1
), cte2 as (
select code, row_number() over (partition by code order by AutoIncrementIdNumber) as [rn]
from table2
)
update cte2
set idNumber = cte1.idNumber
from cte2
inner join cte1
on cte2.code = cte1.code
and cte2.rn = cte1.rn
I only present this because people are often amazed that you can update a common table expression.
This isn't possible without a cursor.
I want to get a subset of a table, here's the example:
1 A
2 A
3 B
4 B
5 C
6 D
7 D
8 D
I want to get the unique record, but with the smallest id:
1 A
3 B
5 C
6 D
How can I write the SQL in SQL Server? Thanks!
Use a common-table expression like this:
;WITH DataCTE AS
(
SELECT ID, OtherCol,
ROW_NUM() OVER(PARTITION BY OtherCol ORDER BY ID) 'RowNum'
FROM dbo.YourTable
)
SELECT *
FROM DataCTE
WHERE RowNum = 1
This "partitions" your data by the second column you have (A, B, C) and orders by the ID (1, 2, 3) - smallest ID first.
Therefore, for each "partition" (i.e. each value of your second column), the entry with RowNum = 1 is the one with the smallest ID for each value of the second column.
select min(id), othercol
from thetable
group by othercol
and maybe with
order by othercol
... at the end if thats important
Try this:
SELECT MIN(Id) AS Id, Name
FROM MyTable
GROUP BY Name
select min(id), column2
from table
group by column2
It helps if you provide the table information in the question - I've just guessed at the column names...