Can You Explain This SQL Query - Inline View Included
The query is taken from "Oracle Database 10g: SQL Fundamentals II" page 3-7 (chapter 3)
I do not fully understand the following query:
SELECT a.last_name, a.salary, a.department_id, b.salavg
FROM employees a, (SELECT department_id,
AVG(salary) salavg
FROM employees
GROUP BY department_id) b
WHERE a.department_id = b.department_id
AND a.salary > b.salavg;
The inline view can return several records. Can you please tell me in step by step how does this work. I understand the concept of join tables and aliases, etc. I just need to know the mechanism of this code.
Thanks
user11164565 wrote:
The query is taken from "Oracle Database 10g: SQL Fundamentals II" page 3-7 (chapter 3)
I do not fully understand the following query:
SELECT a.last_name, a.salary, a.department_id, b.salavg
FROM employees a, (SELECT department_id,
AVG(salary) salavg
FROM employees
GROUP BY department_id) b
WHERE a.department_id = b.department_id
AND a.salary > b.salavg;
The inline view can return several records. Can you please tell me in step by step how does this work. I understand the concept of join tables and aliases, etc. I just need to know the mechanism of this code.
The query is returning the last name, salary , department and average salary of all the departments where salary is greater than the average salary.
HTH
Aman....
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Message was edited by:
GaryKyleAhhh, thanks guys. I'm a bit of a beginner here. This is my first look at explain plans - just had to work out how to see them! I think I understand what is happening now - it looks like that with the index, it does the group by FIRST on all the data and this takes a large amount of time. Am I right?
Before +0:
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How Can I Make This Sql Query To Load Data Correctly (sql server 2014)?
Hi guys
I have a datagridview where the third column is a custom column with all days
of a month. It takes data with a query who distinct the column Improve.
SELECT Improve,Price,Active,Idate FROM (SELECT Improve,Price,Active,Idate, ROW_NUMBER() OVER (PARTITION BY Improve ORDER BY Improve) AS rn FROM tblImprove) tmp WHERE rn = 1
And here is the result :
http://i60.tinypic.com/28gwf83.jpg
The column Active value is 1.
The problem is that column Active values are missing (red values in image).
How can i fix that ?
Thanks in advance
Hi,
Maybe you can try below code, I have changed the order by of the row_number(). Therefore it will sort on the date, and you will get the first date icm with improve cell. If this is not what you are looking for, please explain what the output should be.
SELECT Improve,Price,Active,Idate
FROM
SELECT Improve,Price,Active,Idate, ROW_NUMBER() OVER (PARTITION BY Improve ORDER BY ldate) AS rn
FROM tblImprove
) tmp WHERE rn = 1
Regards,
Reshma
Please Vote as Helpful if an answer is helpful and/or Please mark Proposed as Answer or Mark As Answer when question is answered -
How Can I Make This Sql Query To Load Data Correctly (sql server)?
Hi guys
I have a datagridview where the third column is a custom column with all days
of a month. It takes data with a query who distinct the column Improve.
Here is the code :
Private Sub fill_impro()
dgImprove.Rows.Clear()
Try
Dim i As Integer = 0
Dim query As String = "SELECT Improve,Price,Active,Idate FROM (SELECT Improve,Price,Active,Idate, ROW_NUMBER() OVER (PARTITION BY Price ORDER BY Price) AS rn FROM tblImprove) tmp WHERE rn = 1"
cmd = New SqlCommand(query, clsMSSQL.con)
myDR = cmd.ExecuteReader
If myDR.HasRows Then
While myDR.Read
dgImprove.Rows.Add()
dgImprove.Rows(i).Cells(0).Value = myDR.GetDecimal(myDR.GetOrdinal("Price"))
dgImprove.Rows(i).Cells(1).Value = myDR.GetString(myDR.GetOrdinal("Improve"))
Dim myday As Integer = DatePart(DateInterval.Day, myDR.GetValue(myDR.GetOrdinal("Idate")))
dgImprove.Rows(i).Cells(myday + 1).Value = myDR.GetInt32(myDR.GetOrdinal("Active"))
i = i + 1
End While
End If
myDR.Close()
Catch ex As Exception
MsgBox(ex.Message, MsgBoxStyle.Critical, "Σφάλμα")
End Try
End Sub
And here is the result :
http://i60.tinypic.com/28gwf83.jpg
The column Active value is 1.
The problem is that column Active values are missing (red values in image).
How can i fix that ?
Thanks in advancetry like this
Dim Price As Decimal
Dim improve As String = String.Empty
While myDR.Read
Dim myday As Integer = DatePart(DateInterval.Day, myDR.GetValue(myDR.GetOrdinal("Idate")))
If Not (myDR.GetDecimal(myDR.GetOrdinal("Price")) = Price And myDR.GetString(myDR.GetOrdinal("Improve")) = improve) Then
i += 1
dgimprove.Rows.Add()
dgimprove.Rows(i).Cells(0).Value = myDR.GetDecimal(myDR.GetOrdinal("Price"))
dgimprove.Rows(i).Cells(1).Value = myDR.GetString(myDR.GetOrdinal("Improve"))
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improve = myDR.GetString(myDR.GetOrdinal("Improve"))
End If
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I give you the description of the two tables involved and the error message I get when I run a simple MERGE statement
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Name Null? Type
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14 /
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I get all through the downloading process and move it to my applications. It then ask me if I want to replace the old version with the new one. When I click on replace, a new window comes up with the fact that my computer does have privileges for some of the operations so I cannot complete the process. What really gets me though, is that it still pops up saying I need to download the new version. I do not know what to do.
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Thank you for replying. Yes I deleted the old email address..
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