Re: Sql query - Database Discussion Boards

Re: Need SQl Query

Ben Fair5-Jan-09 5:51

Ben Fair

5-Jan-09 5:51

Yes, sorry, you are right; substringing will be needed.

Keep It Simple Stupid! (KISS)

Confused about instance name in SQL cluster

George_George3-Jan-09 23:15

George_George

3-Jan-09 23:15

Hello everyone,

I am learning to install SQL Cluster. I am confused about the following concepts, does anyone have any good ideas?

1. I am always confused about the differences between instance/node concept, and also confused about instance name and virtual server name for a SQL cluster during setup process. Could anyone help to clarify please?

2. Do I need a dedicated sub-network to install a SQL Cluster and connect the dedicated sub-network to the LAN (which SQL clients are working on) by hub/switch/router? Or such dedicated sub-network is not needed and all nodes in the SQL cluster could be in the same network of the clients?

thanks in advance,
George

Re: Confused about instance name in SQL cluster

Wendelius4-Jan-09 0:49

Wendelius

4-Jan-09 0:49

George_George wrote:
I am always confused about the differences between instance/node concept

Instance is the overall cluster server which is seen by the clients. It represents the SQL Server independently from how many nodes participate in the cluster. So node is the actual installation of the SQL Server. In a cluster yo would have two or more nodes.

George_George wrote:
Do I need a dedicated sub-network to install a SQL Cluster and connect the dedicated sub-network to the LAN

I think, not exactly a sub-network, but you need two independent network adapters. For example you cannot share a single network card (even if it has several ports). The idea is that you do not have a single point of failure. A heartbeat protocol is used between the nodes so it's typical to have one network card to serve the clients and one network card solely for the node conversations. This conversation between nodes can be isolated (and typically it's a good idea) from other network traffic.

The need to optimize rises from a bad design.My articles[^]

Re: Confused about instance name in SQL cluster

George_George4-Jan-09 22:23

George_George

4-Jan-09 22:23

Thanks Mika,

I have 3 more comments,

1. From your reply, I learned that differnet instances seems means different installation -- does that mean different instances will have different database enginer binary (DLL/EXE files)?

2. From the connection string itself, can we distinguish whether it is connection string for cluster and non-cluster?

3. I want to confirm with you that it is not a must for me to have two network adapter for nodes in cluster in order to deploy SQL Server cluster? i.e. could both server and client could reside on the same Class C sub-network, and each of them have only a single network adapter?

regards,
George

Re: Confused about instance name in SQL cluster

Wendelius5-Jan-09 4:33

Wendelius

5-Jan-09 4:33

George_George wrote:
differnet instances seems means different installation

Not quite, you configure an instance and you add several nodes to it. Every node must have identical installation. Instance is what the client sees, node is the machine that runs the services.

George_George wrote:
can we distinguish whether it is connection string for cluster and non-cluster

I think that a client can point to a specific node, but if you do that there's no point in clustering. Typically the client doesn't realize that there's a cluster configuration.

George_George wrote:
could both server and client could reside on the same Class C sub-network, and each of them have only a single network adapter

I think they can be on the same network, but the server must have two separate network adapters.

Perhaps these would help:
- Installing a SQL Server 2008 Failover Cluster[^]
- How to: Create a New SQL Server Failover Cluster (Setup)[^]

The need to optimize rises from a bad design.My articles[^]

Sql query

sarah_chandran3-Jan-09 3:45

sarah_chandran

3-Jan-09 3:45

If table1 has fields Studentname , departmentid
and table2 has fields departmentid,departmentname then can anyone
give me the sql query to get the department name and the number of students in each department.

Re: Sql query

Wendelius3-Jan-09 4:13

Wendelius

3-Jan-09 4:13

Sounds like homework.

Simply join and fetch the data from both tables and then group by department name. Use COUNT to calculate the amount of students.

The need to optimize rises from a bad design.My articles[^]

Re: Sql query

Vimalsoft(Pty) Ltd4-Jan-09 20:09

Vimalsoft(Pty) Ltd

4-Jan-09 20:09

Try this

SELECT Studentname , departmentid
FROM  TABLE1 T1 INNER JOIN TABLE2 T2 ON 
T1.departmentid = T2.departmentid 
ORDER BY departmentid

Hope it helps

Vuyiswa Maseko,

Few companies that installed computers to reduce the employment of clerks have realized their expectations.... They now need more and more expensive clerks even though they call them "Developers" or "Programmers."

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.tiyaneProperties.co.za
vuyiswam@its.co.za

Re: Sql query

ChandraRam4-Jan-09 22:10

ChandraRam

4-Jan-09 22:10

Vuyiswa Maseko wrote:
Try this

SELECT Studentname , departmentid
FROM TABLE1 T1 INNER JOIN TABLE2 T2 ON
T1.departmentid = T2.departmentid
ORDER BY departmentid

The OP wants department name and count of students - your query returns neither.

Poke tongue | ;-P

Re: Sql query

sarah_chandran5-Jan-09 14:01

sarah_chandran

5-Jan-09 14:01

Thank u , just what I needed.
select deptname,COUNT(deptid) from emp,department
where emp.deptid =department.id group by deptname

how to display the data in monthwise formate in MYSQL

jenny_anu2-Jan-09 23:16

jenny_anu

2-Jan-09 23:16

hi
in my project i want to display a report to employee by month wise achivement.
if user select starting date to ending date means it has to display
month wise . if user select 1st qtr means it has to display like this.

-------------|-------------|-------------|
JAN | FEB | MAR |
-------------|-------------|-------------|
target|achive|target|achive|target|achive|
------|------|------|------|------|------|
5 | 4 | 5 | 5 | 4 | 2 |

output screen is like this.. can u guide me. pls. how to do.
Frontend is asp.net using c# and backend is MYSQL

Re: how to display the data in monthwise formate in MYSQL

Wendelius2-Jan-09 23:46

Wendelius

2-Jan-09 23:46

If you mean that months are displayed as columns, is it always a quarter or can user select for example 6 months? If the amount of months is dynamic, I think you must rotate them horizontally when displaying the data (asp.net in this case).

The need to optimize rises from a bad design.My articles[^]

Generate complex table with SQL for Crystal Report

Ryo-kun01012-Jan-09 22:08

Ryo-kun0101

2-Jan-09 22:08

Hello,
I have a problem with the exercise I am currently working with.
The database has 4 table:

PHASE
      id     Name
       1      Morning
       2      Afternoon
       3      Evening
       ...

STAFF
      id     Name
       1       John
       2       Mary
       ...

SESSION
      id      FirstdayOfWeek     DayOfWeek        Phase
       1      5 Jan 2009         Sat                1
       2      5 Jan 2009         Sun                3
       ...

DUTY
      Staff      Session
        1           1
        2           2
        ...

The program is to make report about the number of times that a staff do his/her duty in each phase in a specific month chosen by the user. It may look like this:

                   REPORT
    Staff: John (chosen by user)
    Month: Jan 2009 (chosen by user)
Date              Morning       Afternoon       Evening        ...
10 Jan 2009        yes            no               no
11 Jan 2009         no            no               no
.....
Total                3            6                0

Can you tell me how to make the SQL that give a table like the one above (with Date, Morning, Afternoon, Evening columns) to send it to the Crystal Report? Is this possible in just one SQL query? Thank you in advance.

Re: Generate complex table with SQL for Crystal Report

Wendelius2-Jan-09 22:15

Wendelius

2-Jan-09 22:15

I think you should have a look at DATEPART[^] and CASE[^] combined with joins.

The need to optimize rises from a bad design.My articles[^]

Re: Generate complex table with SQL for Crystal Report

Ryo-kun01013-Jan-09 11:34

Ryo-kun0101

3-Jan-09 11:34

Hi Mika,
thank you for your answer. Of course I have already tried datepart, case and join and it works well with the current example. My problem is the '...' in my writing above. That means the database can be change and unfortunately, my report depends on the Phase table. The number of column, the name of each column, all are dynamic. Can you tell me how to do this in just one SQL query? If it is impossible, is there any solution like adding some more tables or writing some more code?

Re: Generate complex table with SQL for Crystal Report

Wendelius3-Jan-09 22:13

Wendelius

3-Jan-09 22:13

Have you tested PIVOT. If you already have and still not getting the desired result, I think you should use dynamic SQL either by creating a procedure or from the client. If I understood you correctly, first fetch all the phases, after that construct a SQL query with amount of columns based on phase table. After that, use that statement to return the data.

The need to optimize rises from a bad design.My articles[^]

how to catch unhandled errors in sql server 2005

Amit Sk Sharma2-Jan-09 19:56

Amit Sk Sharma

2-Jan-09 19:56

I have put TRY CATCH in my Stored Procedure but it fails when any invalid table or invalid column error occures and it prompts error msg directly in place of putting it in TRY CATCH Error Log.

Is there any way to catch such type of errors through TRY CATCH.

Please Let me know.....

Thanks in advance

With Thanks & Regards
Amit Sk Sharma

Re: how to catch unhandled errors in sql server 2005

Wendelius2-Jan-09 22:11

Wendelius

2-Jan-09 22:11

Unless you are using dynamic sql you will get compile time error and that's not possible to handle with try...catch. So by using dynamic sql you can catch the error at execution time.

The need to optimize rises from a bad design.My articles[^]

sql & attach

reza assar2-Jan-09 7:48

reza assar

2-Jan-09 7:48

i used "create database for attach" to attach an old database to the sqlserver but the database files (like *.mdf and *.ldf and etc) have to be in the previous folder (the old folder that i used to use it as my database folder)
how can i restore data without having to copy it in the old folder ?

i do not want to use backup and restore because they need to have a device and i do not know what can i do if the device deleted . do you know ?

Re: sql & attach

Wendelius2-Jan-09 8:03

Wendelius

2-Jan-09 8:03

reza assar wrote:
to attach an old database to the sqlserver but the database files (like *.mdf and *.ldf and etc) have to be in the previous folder

They don't have to be in the original folder, but if you're moving the log file to a new location, I think you must use ATTACH_REBUILD_LOG.

From CREATE DATABASE[^]: "FOR ATTACH: Specifies that the database is created by attaching an existing set of operating system files. There must be a <filespec> entry that specifies the primary file. The only other <filespec> entries required are those for any files that have a different path from when the database was first created or last attached"

See also: How to: Move a Database Using Detach and Attach[^]

The need to optimize rises from a bad design.My articles[^]

Re: sql & attach

Guffa4-Jan-09 19:47

Guffa

4-Jan-09 19:47

reza assar wrote:
i do not want to use backup and restore because they need to have a device and i do not know what can i do if the device deleted . do you know ?

You don't need a device, you can backup and restore to a file. The UI is a bit confusing, as it's mainly intended for backup to an external device, but you simply change some radio buttons to get to the right place.

Despite everything, the person most likely to be fooling you next is yourself.

new component and release problem

reza assar2-Jan-09 7:38

reza assar

2-Jan-09 7:38

hi i have a problem with a new component installed on my vs 2005
the component`s name is "devExpress"
i used it in one of my applications . but my application will crash when i start it on the other computers (the computers that does not have these components) how can i solve this problem ?
thanks in advance !

Re: new component and release problem

Wendelius2-Jan-09 7:48

Wendelius

2-Jan-09 7:48

If you're referring to DevExpress component manufacturer, you should consult their knowledge base and/or support: http://www.devexpress.com/Support/Center/[^].

The need to optimize rises from a bad design.My articles[^]

Need A Back Script for selected database of SQL 2000.

Vivek Chopade2-Jan-09 3:03

Vivek Chopade

2-Jan-09 3:03

Hi
I need Script to backup selected database of SQL Server 2000. Script should have facility to add the database in the backup schedule in future.

Can any one help me out.

Regards
Vivek

Re: Need A Back Script for selected database of SQL 2000.

Wendelius2-Jan-09 4:38

Wendelius

2-Jan-09 4:38

To get you to the start, open Management Studio, create the backup and script it to a SQL Script.

You can also schedule the backup and then script the job which is created under the Sql Server Agent.

The need to optimize rises from a bad design.My articles[^]

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