I want to retrieve the 2nd last row result and I have seen this question:
How can I retrieve second last row?
but it uses order by which in my case does not work because the Emp_Number Column contains number of rows and date time stamp that mixes data if I use order by .
The rows 22 and 23 contain the total number of rows (excluding row 21 and 22) and the time and day it got entered respectively.
I used this query which returns the required result 21 but if this number increases it will cause an error.
SELECT TOP 1 *
FROM(
SELECT TOP 2 *
FROM DAT_History
ORDER BY Emp_Number ASC
) t
ORDER BY Emp_Number desc
Is there any way to get the 2nd last row value without using the Order By function?
There is no guarantee that the count will be returned in the one-but-last row, as there is no definite order defined. Even if those records were written in the correct order, the engine is free to return the records in any order, unless you specify an order by clause. But apparently you don't have a column to put in that clause to reproduce the intended order.
I propose these solutions:
1. Return the minimum of those values that represent positive integers
select min(Emp_Number * 1)
from DAT_history
where Emp_Number not regexp '[^0-9]'
See SQL Fiddle
This will obviously fail when the count is larger then the smallest employee number. But seeing the sample data, that would represent a number of records that is maybe not expected...
2. Count the records, ignoring the 2 aggregated records
select count(*)-2
from DAT_history
See SQL Fiddle
3. Relying on correct order without order by
As explained at the start, you cannot rely on the order, but if for some reason you still want to rely on this, you can use a variable to number the rows in a sub query, and then pick out the one that has been attributed the one-but-last number:
select Emp_Number * 1
from (select Emp_Number,
#rn := #rn + 1 rn
from DAT_history,
(select #rn := 0) init
) numbered
where rn = #rn - 1
See SQL Fiddle
The * 1 is added to convert the text to a number data type.
This is not a perfect solution. I am making some assumptions for this. Check if this could work for you.
;WITH cte
AS (SELECT emp_number,
Row_number()
OVER (
ORDER BY emp_number ASC) AS rn
FROM dat_history
WHERE Isdate(emp_number) = 0) --Omit date entries
SELECT emp_number
FROM cte
WHERE rn = 1 -- select the minimum entry, assuming it would be the count and assuming count might not exceed the emp number range of 9888000
I have two questions:
When using the select top 10 percent statement, for example on a test database with 100 scores, like this:
Select top 10 percent score
from test
Would SQL Server return the 10 highest scores, or just the top 10 obs based on how the data look like now (e.g. if the data is entered into database in a way that lowest score appears first, then would this return the lowest 10 scores)?
I want to be able to get the top 10 highest scores and bottom 10 lowest scores out of this 100 scores, what should I do?
You could also use the NTILE window function to group your scores into 10 groups of data - group no. 1 would be the lowest 10%, group no. 10 would be the top 10%:
;WITH Percentile AS
(
SELECT
Score,
ScoreGroup = NTILE(10) OVER(ORDER BY Score)
FROM
test
)
SELECT *
FROM Percentile
WHERE ScoreGroup IN (1, 10)
Using a UNION ALL means that it will count all rows twice.
You can do it with a single count as below. Whether or not this will be more efficient will depend (e.g. on indexes).
WITH T
AS (SELECT *,
1E0 * ROW_NUMBER()
OVER (
ORDER BY score) / COUNT(*)
OVER() AS p
FROM test)
SELECT *
FROM T
WHERE p < 0.1
OR p > 0.9
select score from
(Select top 10 percent score
from test
order by score desc
)a
union all
select score from
(select top 10 percent score
from test
order by score asc
)b
if duplicates are allowed use union
Use ascending in your query for the top 90. Then, descending in your query for the top 10. Then, union these two queries
i'm looking to get certain sql results from a query depending on where they are positioned, for example, consider this code
SELECT * FROM Product ORDER BY id asc
which could return at least 100 or so results.
the question is though, how can i get the first 1 - 10 results of that, and then in another different, separate query, how can i get the results that are 11 - 20 or even get the results that are positioned 51 - 60 of that query?
Use a CTE to get the row number and then query by the row column
with your_query as(
SELECT ROW_NUMBER() OVER(ORDER BY ID ASC) AS Row, *
FROM Product
)
select * from your_query
where Row >=5 and Row<=10
There are a number of ways, here's one approach using ROW_NUMBER:
DECLARE #StartRow INTEGER = 11
DECLARE #EndRow INTEGER = 20
;WITH Data AS
(
SELECT TOP(#EndRow) ROW_NUMBER() OVER (ORDER BY id) AS RowNo, *
FROM Product
)
SELECT *
FROM Data
WHERE RowNo BETWEEN #StartRow AND #EndRow
ORDER BY Id
For example I have a table which contains 10'000 rows. I want to select top 100 rows after top 500th row. How can I do this most efficiently.
Query needed for SQL Server 2008
For example i have this query already but i wonder are there any more effective solution
SELECT TOP 100 xx
FROM nn
WHERE cc NOT IN
(SELECT TOP 500 cc
FROM nn ORDER BY cc ASC)
Tutorial 25: Efficiently Paging Through Large Amounts of Data
with cte as (
SELECT ...,
ROW_NUMBER () OVER (ORDER BY ...) as rn
FROM ...)
SELECT ... FROM cte
WHERE rn BETWEEN 500 and 600;
Select T0P 600 *
from my table
where --whatever condition you want
except
select top 500 *
from mytable
where --whatever condition you want
SELECT
col1,
col2
FROM (
SELECT ROW_NUMBER() OVER (
ORDER BY [t0].someColumn) as ROW_NUMBER,
col1,
col2
FROM [dbo].[someTable] AS [t0]
) AS [t1]
WHERE [t1].[ROW_NUMBER] BETWEEN 501 and 600
ORDER BY [t1].[ROW_NUMBER]
Selecting TOP 500, then concatenating the TOP 100 to the result set.
Normally, in order to worth doing this, you need to have some criteria on which to base what your need 500 records for, and only 100 for another condition. I assume that these conditions are condition1 for the TOP 500, and condition2 for the TOP 100 you want. Because the conditions differ, that is the reason why the records might not be the same based on TOP 100.
select TOP 500 *
from MyTable
where -- condition1 -- Retrieving the first 500 rows meeting condition1
union
select TOP 100 *
from MyTable
where -- condition2 -- Retrieving the first 100 rows meeting condition2
-- The complete result set of the two queries will be combined (UNIONed) into only one result set.
EDIT #1
this is not what i meant. i want to select top 100 rows coming after top 500 th row. so selecting rows 501-600
After your comment, I better understood what you want to achieve. Try this:
WITH Results AS (
select TOP 600 f.*, ROW_NUMBER() OVER (ORDER BY f.[type]) as RowNumber
from MyTable f
) select *
from Results
where RowNumber between 501 and 600
Does this help?
I want to select the last 5 records from a table in SQL Server without arranging the table in ascending or descending order.
This is just about the most bizarre query I've ever written, but I'm pretty sure it gets the "last 5" rows from a table without ordering:
select *
from issues
where issueid not in (
select top (
(select count(*) from issues) - 5
) issueid
from issues
)
Note that this makes use of SQL Server 2005's ability to pass a value into the "top" clause - it doesn't work on SQL Server 2000.
Suppose you have an index on id, this will be lightning fast:
SELECT * FROM [MyTable] WHERE [id] > (SELECT MAX([id]) - 5 FROM [MyTable])
The way your question is phrased makes it sound like you think you have to physically resort the data in the table in order to get it back in the order you want. If so, this is not the case, the ORDER BY clause exists for this purpose. The physical order in which the records are stored remains unchanged when using ORDER BY. The records are sorted in memory (or in temporary disk space) before they are returned.
Note that the order that records get returned is not guaranteed without using an ORDER BY clause. So, while any of the the suggestions here may work, there is no reason to think they will continue to work, nor can you prove that they work in all cases with your current database. This is by design - I am assuming it is to give the database engine the freedom do as it will with the records in order to obtain best performance in the case where there is no explicit order specified.
Assuming you wanted the last 5 records sorted by the field Name in ascending order, you could do something like this, which should work in either SQL 2000 or 2005:
select Name
from (
select top 5 Name
from MyTable
order by Name desc
) a
order by Name asc
You need to count number of rows inside table ( say we have 12 rows )
then subtract 5 rows from them ( we are now in 7 )
select * where index_column > 7
select * from users
where user_id >
( (select COUNT(*) from users) - 5)
you can order them ASC or DESC
But when using this code
select TOP 5 from users order by user_id DESC
it will not be ordered easily.
select * from table limit 5 offset (select count(*) from table) - 5;
Without an order, this is impossible. What defines the "bottom"? The following will select 5 rows according to how they are stored in the database.
SELECT TOP 5 * FROM [TableName]
Well, the "last five rows" are actually the last five rows depending on your clustered index. Your clustered index, by definition, is the way that he rows are ordered. So you really can't get the "last five rows" without some order. You can, however, get the last five rows as it pertains to the clustered index.
SELECT TOP 5 * FROM MyTable
ORDER BY MyCLusteredIndexColumn1, MyCLusteredIndexColumnq, ..., MyCLusteredIndexColumnN DESC
Search 5 records from last records you can use this,
SELECT *
FROM Table Name
WHERE ID <= IDENT_CURRENT('Table Name')
AND ID >= IDENT_CURRENT('Table Name') - 5
If you know how many rows there will be in total you can use the ROW_NUMBER() function.
Here's an examble from MSDN (http://msdn.microsoft.com/en-us/library/ms186734.aspx)
USE AdventureWorks;
GO
WITH OrderedOrders AS
(
SELECT SalesOrderID, OrderDate,
ROW_NUMBER() OVER (ORDER BY OrderDate) AS 'RowNumber'
FROM Sales.SalesOrderHeader
)
SELECT *
FROM OrderedOrders
WHERE RowNumber BETWEEN 50 AND 60;
In SQL Server 2012 you can do this :
Declare #Count1 int ;
Select #Count1 = Count(*)
FROM [Log] AS L
SELECT
*
FROM [Log] AS L
ORDER BY L.id
OFFSET #Count - 5 ROWS
FETCH NEXT 5 ROWS ONLY;
Try this, if you don't have a primary key or identical column:
select [Stu_Id],[Student_Name] ,[City] ,[Registered],
RowNum = row_number() OVER (ORDER BY (SELECT 0))
from student
ORDER BY RowNum desc
You can retrieve them from memory.
So first you get the rows in a DataSet, and then get the last 5 out of the DataSet.
There is a handy trick that works in some databases for ordering in database order,
SELECT * FROM TableName ORDER BY true
Apparently, this can work in conjunction with any of the other suggestions posted here to leave the results in "order they came out of the database" order, which in some databases, is the order they were last modified in.
select *
from table
order by empno(primary key) desc
fetch first 5 rows only
Last 5 rows retrieve in mysql
This query working perfectly
SELECT * FROM (SELECT * FROM recharge ORDER BY sno DESC LIMIT 5)sub ORDER BY sno ASC
or
select sno from(select sno from recharge order by sno desc limit 5) as t where t.sno order by t.sno asc
When number of rows in table is less than 5 the answers of Matt Hamilton and msuvajac is Incorrect.
Because a TOP N rowcount value may not be negative.
A great example can be found Here.
i am using this code:
select * from tweets where placeID = '$placeID' and id > (
(select count(*) from tweets where placeID = '$placeID')-2)
In SQL Server, it does not seem possible without using ordering in the query.
This is what I have used.
SELECT *
FROM
(
SELECT TOP 5 *
FROM [MyTable]
ORDER BY Id DESC /*Primary Key*/
) AS T
ORDER BY T.Id ASC; /*Primary Key*/
DECLARE #MYVAR NVARCHAR(100)
DECLARE #step int
SET #step = 0;
DECLARE MYTESTCURSOR CURSOR
DYNAMIC
FOR
SELECT col FROM [dbo].[table]
OPEN MYTESTCURSOR
FETCH LAST FROM MYTESTCURSOR INTO #MYVAR
print #MYVAR;
WHILE #step < 10
BEGIN
FETCH PRIOR FROM MYTESTCURSOR INTO #MYVAR
print #MYVAR;
SET #step = #step + 1;
END
CLOSE MYTESTCURSOR
DEALLOCATE MYTESTCURSOR
Thanks to #Apps Tawale , Based on his answer, here's a bit of another (my) version,
To select last 5 records without an identity column,
select top 5 *,
RowNum = row_number() OVER (ORDER BY (SELECT 0))
from [dbo].[ViewEmployeeMaster]
ORDER BY RowNum desc
Nevertheless, it has an order by, but on RowNum :)
Note(1): The above query will reverse the order of what we get when we run the main select query.
So to maintain the order, we can slightly go like:
select *, RowNum2 = row_number() OVER (ORDER BY (SELECT 0))
from (
select top 5 *, RowNum = row_number() OVER (ORDER BY (SELECT 0))
from [dbo].[ViewEmployeeMaster]
ORDER BY RowNum desc
) as t1
order by RowNum2 desc
Note(2): Without an identity column, the query takes a bit of time in case of large data
Get the count of that table
select count(*) from TABLE
select top count * from TABLE where 'primary key row' NOT IN (select top (count-5) 'primary key row' from TABLE)
If you do not want to arrange the table in ascending or descending order. Use this.
select * from table limit 5 offset (select count(*) from table) - 5;