Howto query average of most recent data in sqlserver - sql

I want to find the average of the most recent x results. Is it possible to use an aggregate function on a limited number of results with sql server?
Here is what I have tried and the errors I get:
select avg(top(100) convert(float, AnalysisData))
from tab
order by DatePerformed desc
Msg 156, Level 15, State 1, Line 1
Incorrect syntax near the keyword
'top'.
select AVG(data)
from (
select top(100) convert(float, AnalysisData) As data
from tab
order by DatePerformed desc
);
Msg 102, Level 15, State 1, Line 7
Incorrect syntax near ')'.
This is sql server 2008


In your second example, you need an alias name for the subquery:
select AVG(data)
from (
select top 100 convert(float, AnalysisData) As data
from tab
order by DatePerformed desc
) Top100Records;
You probably don't need the parenthesis around 100 either.

Related

Select top n after data operations SQL

I want to
Filter a data set
Take distinct of a column
take out top 10 rows of that data set with the distinct column
The code I am using is
SELECT TOP (10) *
FROM (
SELECT DISTINCT(business_id) FROM businessdata
WHERE businessdata.city = 'Phoenix'
)
;
and the error I am getting is
Msg 102, Level 15, State 1, Line 7
Incorrect syntax near ';'.
Where am I going wrong?

You have to give a name to the subquery:
SELECT TOP (10) *
FROM (
SELECT DISTINCT(business_id) FROM businessdata
WHERE businessdata.city = 'Phoenix'
) AS my_subquery
ORDER BY businessdata
;
make sure you also an ORDER BY to correctly set the order and thus make TOP meaningful

Oracle to T-SQL CTE conversion errors

Having trouble converting Oracle syntax to T-SQL. Trying to convert the following statement:
SELECT *
FROM (WITH NEW_USERS AS (SELECT WPP.USER_ID
FROM DSS_ERS_STAGE.ES_W_PARTICIPANT_DIM WPP
MINUS
SELECT PP.USER_ID FROM DSS_ERS_STAGE.ES_PARTICIPANT_DIM PP)
SELECT EWP.USER_ID
,EWP.CANDIDATE_1_0_FLAG
FROM DSS_ERS_STAGE.ES_W_PARTICIPANT_DIM EWP
INNER JOIN NEW_USERS N
ON (EWP.USER_ID = N.USER_ID)
WHERE EWP.CANDIDATE_1_0_FLAG = 1)
Conversion attempt:
SELECT *
FROM (WITH NEW_USERS AS (SELECT WPP.USER_ID
FROM DSS_ERS_STAGE.ES_W_PARTICIPANT_DIM WPP
EXCEPT
SELECT PP.USER_ID FROM DSS_ERS_STAGE.ES_PARTICIPANT_DIM PP)
SELECT EWP.USER_ID
,EWP.CANDIDATE_1_0_FLAG
FROM DSS_ERS_STAGE.ES_W_PARTICIPANT_DIM EWP
INNER JOIN NEW_USERS N
ON (EWP.USER_ID = N.USER_ID)
WHERE EWP.CANDIDATE_1_0_FLAG = 1)
SQL Server returned the following errors:
Msg 156, Level 15, State 1, Line 2
Incorrect syntax near the keyword 'WITH'.
Msg 319, Level 15, State 1, Line 2
Incorrect syntax near the keyword 'with'. If this statement is a common table expression, an xmlnamespaces clause or a change tracking context clause, the previous statement must be terminated with a semicolon.
Msg 102, Level 15, State 1, Line 11
Incorrect syntax near ')'.

SQL Server does not allow for CTE in subquery:
WITH NEW_USERS AS (SELECT WPP.USER_ID
FROM DSS_ERS_STAGE.ES_W_PARTICIPANT_DIM WPP
EXCEPT -- Oracle has MINUS
SELECT PP.USER_ID
FROM DSS_ERS_STAGE.ES_PARTICIPANT_DIM PP)
SELECT EWP.USER_ID
,EWP.CANDIDATE_1_0_FLAG
FROM DSS_ERS_STAGE.ES_W_PARTICIPANT_DIM EWP
INNER JOIN NEW_USERS N
ON (EWP.USER_ID = N.USER_ID)
WHERE EWP.CANDIDATE_1_0_FLAG = 1;
Second thing: SQL Server has EXCEPT keyword instead of MINUS.

Error in SQL Server query - inner join

I am trying to add Percentile value for each record as new column. But i am getting error in my SQL query. Can anyone please help to solve it.
Error message:
Msg 156, Level 15, State 1, Line 3
Incorrect syntax near the keyword 'inner'.
Msg 102, Level 15, State 1, Line 6
Incorrect syntax near 'a'.
Select b.* , a.[Rank_1]/count(b.[Date]) * 100 as Percentile from
[Country_table1$] b where [Country] = 'AUSTRALIA'
inner join
(
select [MSCI_Price_idx], [Country], rank() OVER (PARTITION BY [Country]
ORDER BY [MSCI_Price_idx] DESC) AS [Rank_1]
from [Country_table1$]
GROUP BY [MSCI_Price_idx],[Country]
) a
ON a.[Country] = b.[Country]

You have your where statement in the wrong place. Joins are formally part of the from statement and thus come before criteria. To have your criterion at the bottom check the correct table you use the alias.
Select b.* , a.[Rank_1]/count(b.[Date]) * 100 as Percentile from
[Country_table1$] b
inner join
(
select [MSCI_Price_idx], [Country], rank() OVER (PARTITION BY [Country]
ORDER BY [MSCI_Price_idx] DESC) AS [Rank_1]
from [Country_table1$]
GROUP BY [MSCI_Price_idx],[Country]
) a
ON a.[Country] = b.[Country]
where b.[Country] = 'AUSTRALIA'

SELECT query using group by

I don't know why the following query is not working:
SELECT whs_code, pdt_code,case_dt_yyyymmdd, fresh_frozen_status,
SUM(qty_cases_on_hand)-Qty, SUM(qty_weight_on_hand)-Wt, operation
FROM
(
SELECT whs_code,pdt_code,case_dt_yyyymmdd,fresh_frozen_status,operation,SUM(qty_cases_on_hand) AS Qty, SUM(qty_weight_on_hand) AS Wt
FROM tbl_inventory_activity_rpt1
WHERE operation ='RU'
GROUP BY whs_code,pdt_code,case_dt_yyyymmdd,fresh_frozen_status,operation
)
WHERE operation='SU'
GROUP BY whs_code,pdt_code,case_dt_yyyymmdd,fresh_frozen_status,operation`
The error is :
Msg 156, Level 15, State 1, Line 4 Incorrect syntax near the keyword 'WHERE'.
To make it simple to understand what i am trying to do here, please see the example
I need data as result of
(SELECT x FROM tbl_table Where column y='SU')-(SELECT x FROM tbl_table Where column y='RU')

SELECT ru.whs_code,
ru.pdt_code,
ru.case_dt_yyyymmdd,
ru.fresh_frozen_status,
ru.operation,
ru.Qty - su.Qty AS Qty_Diff,
ru.Wt - su.Wt AS Wt_Diff
FROM
(
SELECT whs_code,
pdt_code,
case_dt_yyyymmdd,
fresh_frozen_status,
operation,
SUM(qty_cases_on_hand) AS Qty,
SUM(qty_weight_on_hand) AS Wt
FROM tbl_inventory_activity_rpt1
WHERE operation ='RU'
GROUP BY whs_code,pdt_code,case_dt_yyyymmdd,fresh_frozen_status,operation
) ru,
(
SELECT whs_code,
pdt_code,
case_dt_yyyymmdd,
fresh_frozen_status,
operation,
SUM(qty_cases_on_hand) AS Qty,
SUM(qty_weight_on_hand) AS Wt
FROM tbl_inventory_activity_rpt1
WHERE operation ='SU'
GROUP BY whs_code,pdt_code,case_dt_yyyymmdd,fresh_frozen_status,operation
) su
WHERE ru.whs_code = su.whs_code
AND ru.pdt_code = su.pdt_code
AND ru.case_dt_yyyymmdd = su.case_dt_yyyymmdd
AND ru.fresh_frozen_status = su.fresh_frozen_status
AND ru.operation = su.operation;

Get MAX value from a TOP number of records

I have the following MS SQL Query
select top 10 RegisterTime
from orderNotifications
order by RegisterTime asc
How can I get the max RegisterTime of that query ?
I have tried this
select max(RegisterTime) in (
select top 10 RegisterTime
from orderNotifications
order by RegisterTime asc
)
But I am getting
Msg 156, Level 15, State 1, Line 1 Incorrect syntax near the keyword
'in'.
Msg 156, Level 15, State 1, Line 4 Incorrect syntax near the
keyword 'order'.

Make your TOP 10 query a subquery:
SELECT MAX(RegisterTime)
FROM (SELECT TOP 10 RegisterTime
FROM orderNotifications
ORDER BY RegisterTime
)sub