Is there a way to make a simple GROUP BY query with SQL and not use COUNT,AVG or SUM? I want to show all columns and group it with a single column.
SELECT * FROM [SPC].[dbo].[BoardSFC] GROUP BY boardsn
The query above is working on Mysql but not on SQL, is there a way to achieve this? any suggestion would be great
UPDATE: Here is my data I just need to group them by boardsn and get imulti equals to 1
I thing you just understand 'group data' in a different way than it is implemented in sql server. You simply want rows that have the same value together in the result and that would be ordering not grouping. So maybe what you need is:
SELECT *
FROM [SPC].[dbo].[BoardSFC]
WHERE imulti = 1
ORDER BY boardsn
The query above is working on Mysql but not on SQL, is there a way to achieve this? any suggestion would be great
No, there is not. MySQL only lets you do this because it violates the various SQL standards quite egregiously.
You need to name each column you want in the result-set whenever you use GROUP BY. The SELECT * feature is only provided as a convenience when working with data interactively - in production code you should never use SELECT *.
You could use a TOP 1 WITH TIES combined with a ORDER BY ROW_NUMBER.
SELECT TOP 1 WITH TIES *
FROM [SPC].[dbo].[BoardSFC]
ORDER BY ROW_NUMBER() OVER (PARTITION BY boardsn ORDER BY imulti)
Or more explicitly, use ROW_NUMBER in a sub-query
SELECT *
FROM
(
SELECT *, ROW_NUMBER() OVER (PARTITION BY boardsn ORDER BY imulti) as RN
FROM [SPC].[dbo].[BoardSFC]
) q
where RN = 1
This is a very simple question but I can't seem to find documentation on it. How one would query rows by index (ie select the 10th through 20th row in a table)?
I know there's a row_numbers function but it doesn't seem to do what I want.
Do not specify any partition so your row number will be an integer between 1 and your number of record.
SELECT row_num FROM (
SELECT row_number() over () as row_num
FROM your_table
)
WHERE row_num between 100000 and 100010
I seem to have found a roundabout and clunky way of doing this in Athena, so any better answers are welcome. This approach requires you have some numeric column in your table already, in this case named some_numeric_column:
SELECT some_numeric_column, row_num FROM (
SELECT some_numeric_column,
row_number() over (order by some_numeric_column) as row_num
FROM your_table
)
WHERE row_num between 100000 and 100010
To explain, you first select some numeric column in your data, then create a column (called row_num) of row numbers which is based on the order of your selected numeric column. Then you wrap that all in a select call because Athena doesn't support creating and then conditioning on the row_num column within a single call. If you don't wrap it in a second SELECT call Athena will spit out some errors about not finding a column named row_num.
I want to number the rows in my result set. I want some way I can have a result set of 3 records use some SQL keyword to generate a column that would read 1,2,3 for watch of the records...
I know I can make a temp table with an auto increment column but i wanted to know if there was a way I can get this back from a SQL query?
SELECT row_count,
project_name,
project_id
FROM Project
anything available like "row_count" that i am dreaming of?
Ordering by SELECT 0 will give you an incrementing column and saves a potentially unnecessary sort.
SELECT ROW_NUMBER() over (order by (select 0)) as row_count,
project_name,
project_id
FROM Project
Sounds like you want ROW_NUMBER, an analytic/ranking function. But it's unclear what you want to base the numbering on - this assumes the project_id, starting at the smallest value:
SELECT ROW_NUMBER() OVER(ORDER BY p.project_id) AS row_count,
p.project_name,
p.project_id
FROM PROJECT p
is there a simple way to get the number of the current item in a simple SELECT? I need to deliver a column based on a calculation that involves the number of the current index in the select. I am simplifing my problem to an extreme, but roughly speaking, here is an example:
SELECT column1 * ITEMINDEX FROM table
I hope I am being clear. I am using SQL Server. Thank you.
In SQL Server 2005+:
SELECT m.*, ROW_NUMBER() OVER (ORDER BY column) AS rn
FROM mytable m
SQL does not have concept of implicit row number, that's why you need ORDER BY clause to define the order of rows.
What is the most efficient way to read the last row with SQL Server?
The table is indexed on a unique key -- the "bottom" key values represent the last row.
If you're using MS SQL, you can try:
SELECT TOP 1 * FROM table_Name ORDER BY unique_column DESC
select whatever,columns,you,want from mytable
where mykey=(select max(mykey) from mytable);
You'll need some sort of uniquely identifying column in your table, like an auto-filling primary key or a datetime column (preferably the primary key). Then you can do this:
SELECT * FROM table_name ORDER BY unique_column DESC LIMIT 1
The ORDER BY column tells it to rearange the results according to that column's data, and the DESC tells it to reverse the results (thus putting the last one first). After that, the LIMIT 1 tells it to only pass back one row.
If some of your id are in order, i am assuming there will be some order in your db
SELECT * FROM TABLE WHERE ID = (SELECT MAX(ID) FROM TABLE)
I think below query will work for SQL Server with maximum performance without any sortable column
SELECT * FROM table
WHERE ID not in (SELECT TOP (SELECT COUNT(1)-1
FROM table)
ID
FROM table)
Hope you have understood it... :)
I tried using last in sql query in SQl server 2008 but it gives this err:
" 'last' is not a recognized built-in function name."
So I ended up using :
select max(WorkflowStateStatusId) from WorkflowStateStatus
to get the Id of the last row.
One could also use
Declare #i int
set #i=1
select WorkflowStateStatusId from Workflow.WorkflowStateStatus
where WorkflowStateStatusId not in (select top (
(select count(*) from Workflow.WorkflowStateStatus) - #i ) WorkflowStateStatusId from .WorkflowStateStatus)
You can use last_value: SELECT LAST_VALUE(column) OVER (PARTITION BY column ORDER BY column)...
I test it at one of my databases and it worked as expected.
You can also check de documentation here: https://msdn.microsoft.com/en-us/library/hh231517.aspx
OFFSET and FETCH NEXT are a feature of SQL Server 2012 to achieve SQL paging while displaying results.
The OFFSET argument is used to decide the starting row to return rows from a result and FETCH argument is used to return a set of number of rows.
SELECT *
FROM table_name
ORDER BY unique_column desc
OFFSET 0 Row
FETCH NEXT 1 ROW ONLY
SELECT TOP 1 id from comission_fees ORDER BY id DESC
In order to retrieve the last row of a table for MS SQL database 2005, You can use the following query:
select top 1 column_name from table_name order by column_name desc;
Note: To get the first row of the table for MS SQL database 2005, You can use the following query:
select top 1 column_name from table_name;
If you don't have any ordered column, you can use the physical id of each lines:
SELECT top 1 sys.fn_PhysLocFormatter(%%physloc%%) AS [File:Page:Slot],
T.*
FROM MyTable As T
order by sys.fn_PhysLocFormatter(%%physloc%%) DESC
SELECT * from Employees where [Employee ID] = ALL (SELECT MAX([Employee ID]) from Employees)
This is how you get the last record and update a field in Access DB.
UPDATE compalints SET tkt = addzone &'-'& customer_code &'-'& sn where sn in (select max(sn) from compalints )
If you have a Replicated table, you can have an Identity=1000 in localDatabase and Identity=2000 in the clientDatabase, so if you catch the last ID you may find always the last from client, not the last from the current connected database.
So the best method which returns the last connected database is:
SELECT IDENT_CURRENT('tablename')
Well I'm not getting the "last value" in a table, I'm getting the Last value per financial instrument. It's not the same but I guess it is relevant for some that are looking to look up on "how it is done now". I also used RowNumber() and CTE's and before that to simply take 1 and order by [column] desc. however we nolonger need to...
I am using SQL server 2017, we are recording all ticks on all exchanges globally, we have ~12 billion ticks a day, we store each Bid, ask, and trade including the volumes and the attributes of a tick (bid, ask, trade) of any of the given exchanges.
We have 253 types of ticks data for any given contract (mostly statistics) in that table, the last traded price is tick type=4 so, when we need to get the "last" of Price we use :
select distinct T.contractId,
LAST_VALUE(t.Price)over(partition by t.ContractId order by created ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING)
from [dbo].[Tick] as T
where T.TickType=4
You can see the execution plan on my dev system it executes quite efficient, executes in 4 sec while the exchange import ETL is pumping data into the table, there will be some locking slowing me down... that's just how live systems work.
It is very simple
select top 10 * from TableName order by 1 desc
SELECT * FROM TABLE WHERE ID = (SELECT MAX(ID) FROM TABLE)
I am pretty sure that it is:
SELECT last(column_name) FROM table
Becaause I use something similar:
SELECT last(id) FROM Status