[Webinar] Streamline your web hosting managementRegister Today

x
?
Solved

select view to view in sql

Posted on 2014-10-07
8
Medium Priority
?
162 Views
Last Modified: 2014-10-13
I have a select statement which was written awhile back. From VB code it calls ike this :
select *from vw_sample_1

 Using cn As New OleDb.OleDbConnection(sConnString)
        cn.Open()
        Dim cmd As New OleDb.OleDbCommand("select *from vw_sample_1", cn)
        Dim r As OleDb.OleDbDataReader = cmd.ExecuteReader()

       etc...

        cn.Close


inside vw_sample_1  is

select *from vw_sample_1 s1
     inner join vw_sample_2 s2
      on s1.id   = s2.id


inside vw_sample_2

select  * from vw_sample_2
where startdate between DATEADD(day, -90, GETDATE()) and getdate()

Instead of setting  a fixed of last 90 days, I want use variable instead.  User can pass 30, 90, 60, etc.

Is there a way to pass a variable from vw_sample_1 to vw_sample_2 ?
0
Comment
Question by:VBdotnet2005
8 Comments
 
LVL 49

Expert Comment

by:PortletPaul
ID: 40367573
No
0
 
LVL 49

Expert Comment

by:PortletPaul
ID: 40367577
Views do not have parameters, you use where clauses instead.

I suspect you have substantially reduced the real sql involved, but if we take your example as

vw_sample_1  calls: vw_sample_2  and this has a hardcoded -90

Then remove that hardcoded date range from vw_sample_2

then include the wanted date range through your where clause

But I cannot be more specific unless I saw more real code (and even then I might have to see data as well).
0
 

Author Comment

by:VBdotnet2005
ID: 40367581
How about create a small table, Startdate_table.  Update Startdate field from vb code first, sample set to 30 and from vw_sample_2

select  * from vw_sample_2
where startdate between (select startdate from Startdate_table) and getdate()
0
The new generation of project management tools

With monday.com’s project management tool, you can see what everyone on your team is working in a single glance. Its intuitive dashboards are customizable, so you can create systems that work for you.

 

Author Comment

by:VBdotnet2005
ID: 40367584
PortletPaul,

It was written awhile back by a previous developer. It is a long...long select statement which call view after view after view. It is very confusing. I have never seen view calls views, and views.
0
 
LVL 49

Expert Comment

by:PortletPaul
ID: 40367682
view of views of views: then it's almost invariably going to be less than optimal.

You could use a table - but!!! what about concurrent use?

What isn't well understood is you don't need a parameter to make things efficient in SQL. Parameters have there place in the world and they can be used with functions and stored procedures - but not with views. (and views should not need them either).

Without more details I can only give you generic answers.
0
 
LVL 53

Accepted Solution

by:
Vitor Montalvão earned 2000 total points
ID: 40367757
Why don't you change the code?
(...)
Dim cmd As New OleDb.OleDbCommand("select * from vw_sample_1 where startdate between DATEADD(day, -30, GETDATE()) and getdate() ", cn)
(...)

Open in new window

I posted an example with 30 days but you can easily transform it in a variable and use the variable instead of a constant.
0
 
LVL 71

Expert Comment

by:Éric Moreau
ID: 40368166
instead of a View, you can create a User Defined Function that accepts parameters
0
 
LVL 49

Expert Comment

by:PortletPaul
ID: 40376436
"Views do not have parameters, you use where clauses instead."
0

Featured Post

The new generation of project management tools

With monday.com’s project management tool, you can see what everyone on your team is working in a single glance. Its intuitive dashboards are customizable, so you can create systems that work for you.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article I will describe the Copy Database Wizard method as one possible migration process and I will add the extra tasks needed for an upgrade when and where is applied so it will cover all.
International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
SQL Database Recovery Software repairs the MDF & NDF Files, corrupted due to hardware related issues or software related errors. Provides preview of recovered database objects and allows saving in either MSSQL, CSV, HTML or XLS format. Ensures recov…
Stellar Phoenix SQL Database Repair software easily fixes the suspect mode issue of SQL Server database. It is a simple process to bring the database from suspect mode to normal mode. Check out the video and fix the SQL database suspect mode problem.

591 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question