Another Easy One: Views
Mar 16, 2008
scenario I have 2 tables one is called "Site" which contains columns ID, Address1, Address2,City,StateID,ZipCode and the second table is called "State" which contains columns ID,Name,Abbreviation. I am looking to make a view that contains all the sites with the state inner joined on stateid to make my all my other queries easier. That is so I can just select from the view without having to do the inner join on the state. My question is when a new record is added to table Site do I have "recreate"/update the view?
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Apr 3, 2006
Fellow database developers,I would like to draw on your experience with views. I have a databasethat includes many views. Sometimes, views contains other views, andthose views in turn may contain views. In fact, I have some views inmy database that are a product of nested views of up to 6 levels deep!The reason we did this was.1. Object-oriented in nature. Makes it easy to work with them.2. Changing an underlying view (adding new fields, removing etc),automatically the higher up views inherit this new information. Thismake maintenance very easy.3. These nested views are only ever used for the reporting side of ourapplication, not for the day-to-day database use by the application.We use Crystal Reports and Crystal is smart enough (can't believe Ijust said that about Crystal) to only pull back the fields that arebeing accessed by the report. In other words, Crystal will issue aSelect field1, field2, field3 from ReportingView Where .... eventhough "ReportingView" contains a long list of fields.Problems I can see.1. Parent views generally use "Select * From childview". This meansthat we have to execute a "sp_refreshview" command against all viewswhenever child views are altered.2. Parent views return a lot of information that isn't necessarilyused.3. Makes it harder to track down exactly where the information iscoming from. You have to drill right through to the child view to seethe raw table joins etc.Does anyone have any comments on this database design? I would love tohear your opinions and tales from the trenches.Best regards,Rod.
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Sep 6, 2007
Which is more efficient? One large view that joins >=10 tables, or a few smaller views that join only the tables needed for individual pages?
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Jun 28, 2007
Hello.
Newbie here. I've only been using SQL for about a year now and have some minor questions about sql objects that reference other objects.
We have some views which reference other views in the joins. I will call one the primary view and the one being referenced in the joins as the secondary view.
Recently we made changes to the secondary view.
After which the primary views which referenced it would not work because of this change and had to be 'refreshed' by using drop/create scripts which essentially just dropped it and recreated the exact same view. I do not recall the exact error message that was returned other than it seemed to suggest that it could no longer see the secondary view since it had been changed. Nothing in the primary view was changed in any way, just the secondary.
Some here where I work have suggested off hand that this was a recompile of the primary view because the contents of the secondary changed.
My questions are:
1. Exactly why did this happen and is there a proper name for it when it does?
2. The same problem does not seem to occur when we have stored procedures referencing views in the joins which had just been changed. Why is that?
Thanks for any help on the matter. I greatly appreciate it.
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Feb 22, 2007
Hello,
to make a report easier I'm developing it using a view of joined views of joined views.
Is there any significant performance penalty as opposed to just having one big select?
Cheers.
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Mar 14, 2006
Hello There,I'm trying to create a view that has calculations dependent oncalculations, where the problem resides is that each time I make acalculation I must create an intermediate view so I can reference aprevious calculation.for example lets say I have my_table that has columns a & b. now I wanta view that has a & b, c = a + b, and d = c + 1.this is grossly simplified, the calculations I actually use are fairlycomplex and copying / pasting them is out of the question.so what I have is my_view_a which makes column c, and my my_view_finalwhich makes column d (however, in my real application I have 5 of theseviews, a/b/c/d/e/)is there anyway I can consolidate all these views into one? I wasthinking of using a stored procedure with temp tables or somethingalong those lines.I just which I can use the aliases that I create for c in d in onestep.any insight would be greatly appreciated.
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Jun 9, 2004
I'm banging my head against the wall. It's probably pretty simple so here goes...
I have a form that supposed to add records to a table on the database. I'm pretty sure I have the dataAdapter and Dataset set right but when I add a record, it complains that the primary key can’t be null. I’ve tried different things, including removing those fields and variables from the stored Proc, changing the Identity Properties of the Table, changing the AutoIncrement settings on the Dataset for that field, but all give me different errors. Nothing actually makes it work. This database has many records in it and the Primary key is a decimal field that starts at 5, then next was 10, then 28, then it started getting consecutive after 110. (111, 112, 113, etc.) (I'm porting over an old database to a new web site, so I'm somewhat contrained by the database.)
I guess my question is for adding records in to a database that has a primary unique key constraint. Certainly this is a pretty common thing. Obviously I do not want users to enter that in themselves, I thought it should simply autocreate/autonumber. So what is the best procedure and gotcha’s I need to watch out for?
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Sep 16, 2004
if i have the following code, how do i know if the transaction was actually successful, so basically where in this code can i write TRANSACTION SUCCESFUL?
try
{
//Open up the connection
conn.Open();
//Setup the Transaction
trans = conn.BeginTransaction();
//First query in transaction
pre_query = "Delete from Menu where spec_name="
+ "'"
+ spec_name_array[i].Text.ToString()
+ "'" ;
//Second query in transaction
query = "INSERT into Menu VALUES ('"
+ Calendar1.SelectedDate
+"','"
+ spec_name_array[i].Text.ToString()
+"','"
+ spec_desc_array[i].Text.ToString()
+"','"
+spec_price_array[i].Text.ToString()
+"',1)";
SqlCommand comm = new SqlCommand(pre_query,conn);
//Setup the command to handle transaction
comm.Transaction = trans;
//Execute first query
comm.ExecuteNonQuery();
//Add in second query
comm.CommandText = query;
//Execute second query
comm.ExecuteNonQuery();
trans.Commit();
}
catch(SqlException ex)
{
com_label.Text = "Submission Not complete, did you forget the date or something else?";
//Undo all queries
trans.Rollback();
}
finally
{
conn.Close();
}
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Aug 16, 2006
This may not be the right place for this post...but my head is hurting and I can't think right now.
I have a SQL table of users. Each record has a required 'Birthdate' field. I'd like to order this by the days left till the give birthday, keeping in mind that the year may be 1980 or their birthday might have been 2 weeks ago.
Can someone cure my headache?
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Mar 3, 2006
I have written 2 custom connection mgr€™s.
One connects the data from an oracle source
One connects so I can put the data on a sql server.
These both work well and it makes it a lot easier across development, test, production.
But now I would like a good way to do this
I have 10 tables to copy from oracle. The only difference is just the name of the table.
static string[] g_tables =
{
"table_name_1",
"table_name_2",
"table_name_3",
€¦
};
foreach (string str_table in g_tables)
{
Oracle.DataAccess.Client.OracleCommand OracleCommand = new Oracle.DataAccess.Client.OracleCommand
(
"select * from " + str_table,
OracleConnection
);
Oracle.DataAccess.Client.OracleDataReader OracleDataReader =
OracleCommand.ExecuteReader();
// dump out to raw file destination
}
I understand there are some pieces left out but that is the basic idea. It seems like I€™m going to have write custom pieces for each step.
It does not seem like there is any advantage to using SSIS. Should I give up now and stick to writing windows services for stuff like this?
I could just write a specific piece for each table but the only difference is the table name.
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Sep 5, 2006
I need to determine the top 20 most frequent occurences of a value in a specific field using SQL.
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Oct 30, 2007
My table structure...
enddt datetime(8)
status varchar(20)
when enddt time equal to server time.
I want to change status field to expired.
What is the easy way to do this?.
enddt status
8/22/2005 7:00:00 PM expired
9/22/2005 8:30:00 PM expired
10/30/2005 7:30:00 PM live
11/22/2005 9:30:00 PM live
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Sep 18, 2007
I completely forgot how to do this. I want one of my groups in the matrix to take its week number (1-7) as Monday-Sunday.
so it would kind of be like this:
=IIF(Fields!DayOfWeek.Value=2,"Mon",
ELSE(Fields!DayOfWeek.Value=3,"Tues",
Else(Fields!DayOfWeek.Value=4,"Wed",
etc etc
Am i doing this right, or am i off??
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Sep 5, 2007
If I have a 64 bit version of SQL 2005 installed, will "select @@version" indicate it is a 64 bit version? If not, how do I determine such? Thanks in advance.
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Oct 4, 2007
I have a column in my report that i want to show percentage change from the previous year to this year. So i enter all kinds of different type of formats for the formula, and keep getting the wrong answers or error messeges. Here's what i have tried recently:
=SUM((Fields!LYTD_Amount.Value - Fields!YTD_Amount.Value) (Fields!YTD_Amount.Value*100))
Its pretty much Last year to date Minues Year to Date , Divided by Year to Date, Multiplied by 100.
any suggestions? Everytime i try to put an aggregate in the box, its always tricky.
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Dec 21, 2006
hi,
I have this simple sql query - it should be pretty obvious what I'm trying to achieve but this syntax isn't accepted on SQL 2005, any suggestions?
SELECT Name FROM Users WHERE UsersID IN (EXEC dbo.ReturnDataByModule 'Groups',1200)
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Oct 19, 2007
What is the equivalent of Double for SQL Server?
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Mar 16, 2008
Ok - I am still a bit weak on SQL. My understanding of FK relationships in a database are to reinforce the data integrity - Correct? For example, does it make sure that the id given for SiteID does indeed exists. Can it link tables like JOIN in select statements? If not, is there any gains by creating them, such as performance?
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Jan 6, 2004
I am working on a WebMatrix ASP project. I have a query that returns a System.Data.DataSet but I don't know how to assign the DataSet to a variable so that I can run some validation tests on it.
This is what I have so far...What I want to do is assign the dataset to a variable and to see if it is NULL or Not. I don't how??? Any help would be awesome.
Sub Button1_Click(sender As Object, e As EventArgs)
???? = MyQueryMethod(txtPhone.Text)
Thanks,
Matt
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Nov 21, 2004
I have a simple SQL table. The data looks like this:
products_ID----category----product_local
1----CORE----0
2----BASE----0
3----BRANCH----1
4----LEAF----3
I need to create a SQL statement that produces all category items where that ROW's products_ID is not found in ANY product_local in the table. So in the table above only the category BASE and LEAF would be printed because their products_ID are not found in any product_local in the table.
TIA as I am completely stuck!
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Nov 30, 2004
OK, I have two cols of data:
COL1 COL2
test ing
tams ert
test pan
ted ted
hom jis
ted sam
tams dom
test ut
I need to simply pull one row of data from the given rows. Whats in COL2 is not relevant. So an example would be:
I want to retrieve a row(any row, but only one) where COL1 = 'test'
An ecceptable result woould be:
COL1 COL2
test ing
or
COL1 COL2
test pan
or
COL1 COL2
test ut
I would appreciate any help. This is driving me nuts. Seems like it would be easy.
TIA,
STue
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Mar 1, 2001
Hi there,
I'm using bcp to import data into my database. the datetime format in the bcp file is ymd and my database has mdy datetime format. Is there any easy way to convert ymd into mdy when using bcp?
thanks a lot for your help!
Lena
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Apr 5, 1999
Is there an easy way to update a Value field
for all records in One Table from a Value Field in another?
Both Tables have the same number of records.
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Aug 2, 2002
Hi,
the following Insert statement is not acting like i would expect it. The final column (Average) divides two columns([Sum of Scores] / [Count Of Scores]) . The Average column is a numeric column with 5 decimal places. Yet, the result of the division is a whole number (no fractions). Why is this.
any help would be appreciated
Thanks,
Jim
Insert [Bankers_Scores_lead] ([ID], EqorMA, Region, Period,IBFirm, UndNeed ,QualIdea ,ProfAggr ,SpKnow ,negskill ,Perchem, RepPri, Repcomp, TranType, [Count Of Scores], [Sum of Scores], Average)
SELECT [ID],
EqorMA,
Region,
Period,
IBFirm,
UndNeed,
QualIdea,
ProfAggr,
SpKnow,
negskill,
Perchem,
RepPri,
Repcomp ,
TranType,
(Case when [UndNeed] >0 then 1 Else 0 END)
+(Case when [QualIdea] >0 then 1 Else 0 END)
+(Case when [ProfAggr] >0 then 1 Else 0 END)
+(Case when [SpKnow] >0 then 1 Else 0 END)
+(Case when [Perchem] >0 then 1 Else 0 END)
+(Case when [negskill] >0 then 1 Else 0 END)
,
(ISNULL([UndNeed],0))
+(ISNULL([QualIdea],0))
+(ISNULL([ProfAggr],0))
+(ISNULL([SpKnow],0))
+(ISNULL([negskill],0))
+ (ISNULL([Perchem],0))
,
((
(ISNULL([UndNeed],0))+
(ISNULL([QualIdea],0))+
(ISNULL([ProfAggr],0))+
(ISNULL([SpKnow],0))+
(ISNULL([Perchem],0)) +
(ISNULL([negskill],0)
))
/((Case when [UndNeed] >0 then 1 Else 0 END)
+(Case when [QualIdea] >0 then 1 Else 0 END)
+(Case when [ProfAggr] >0 then 1 Else 0 END)
+(Case when [SpKnow] >0 then 1 Else 0 END)
+(Case when [Perchem] >0 then 1 Else 0 END)
+(Case when [negskill] >0 then 1 Else 0 END)
))
FROM tmp_Bankers_Scores
Here is the create table statement
CREATE TABLE [dbo].[Bankers_Scores_lead] (
[ID] [int] NOT NULL ,
[EqorMA] [smallint] NOT NULL ,
[Region] [smallint] NOT NULL ,
[Period] [int] NULL ,
[IBFirm] [int] NULL ,
[UndNeed] numeric(8,5) NULL ,
[QualIdea] numeric(8,5) NULL ,
[ProfAggr] numeric(8,5) NULL ,
[SpKnow] numeric(8,5) NULL ,
[negskill] numeric(8,5) NULL ,
[Perchem] numeric(8,5) NULL ,
[RepPri] numeric(8,5) NULL ,
[Repcomp] numeric(8,5)NULL ,
[TranType] [smallint] NULL ,
[Count Of Scores] numeric(8,5) NULL ,
[Sum of Scores] numeric(8,5) NULL ,
[Average] numeric(8,5) NULL
) ON [PRIMARY]
here is the output
ID EqorMA Region Period IBFirm UndNeed QualIdea ProfAggr SpKnow negskill Perchem RepPri Repcomp TranType Count Of Scores Sum of Scores Average
----------- ------ ------ ----------- ----------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- -------- --------------- ------------- ----------
75659 5 2 9 504 9.00000 8.00000 7.00000 8.00000 8.00000 8.00000 1.00000 .00000 11 6.00000 48.00000 8.00000
75659 5 2 9 504 9.00000 8.00000 7.00000 8.00000 8.00000 8.00000 1.00000 .00000 11 6.00000 48.00000 8.00000
79360 6 5 9 501 9.00000 8.00000 9.00000 8.00000 8.00000 8.00000 1.00000 .00000 15 6.00000 50.00000 8.00000
79360 6 5 9 501 9.00000 8.00000 9.00000 8.00000 8.00000 8.00000 1.00000 .00000 15 6.00000 50.00000 8.00000
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Aug 15, 2007
Hi I'm new to SQL and I'm stuggling with a simple query in MS-server 2005 and wondered if anyone can help me.
I'm trying to devide the ansewrs of two seperate queries, but both the queries use the same coloumn in the where clause to get the answer. Please can some one help!
eg.
select Sum(column1)
where column1 = 'x'
devided by
select Sum(column1)
where column1 = 'y'
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Jul 1, 2004
hi.. guys this is simple for you guys how can i make ms access to display the current date in a col.... when i go to insert a new line i how can i make it so that its allready there? i dont have to type it??????
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Jun 1, 2006
I have a ASP page where the user posts part of the name field. Then i need to provides the matches. (providing partial comparision of the field & correcting bad spelling)
example:
User posts 'softwair' (should be software)
the query look like this
Select Name from A where Name is like '%softwair%' <-- but appling soundex on it in the like field, or something like it.
I could make a copy of the column and update all info in the field to the soundex value, but then the like statement would not get it if the value was only part of it. for example say the data values where like 'Microsoft Software', or 'My Software Solutions', ect...
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Jun 22, 2007
I'm trying to find records in the 'user' table that DO NOT have a record in the 'stuff' table. So basically the statement should only return record 3 from the user table since there is not record in the stuff table for it. I think it a join, but I'm second guessing my self. Can some one please assist me. Thanks in advance.
user
uid name
1 James
2 Erick
3 Todd
stuff
userid thing
1 car
1 house
2 mansion
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Sep 13, 2007
Hey all,
A nice easy BCP question for y'all...
I'm currently running:
DECLARE @sql varchar(2000)
SET @sql = 'BCP master..sysobjects OUT C:sysobjects.csv -c -t, -T -S' + @@ServerName
EXEC master..xp_cmdshell @sql
Which works fine!
But how on earth do I save it to my local PC?
May sound silly, but this is one of my first adventures into BCP and I'd rather not "pollute" the server with my test files!
Thankyall!
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Feb 20, 2008
I'm used to forming Select statements for IBM System i imbedded SQL in High Level source programs. I now find myself converting System i RPG programs to VB.NET classes. What I want to know is how to insert the value of a class variable into a SQL Select string. In the IBM world, I would do:
Select STCTYC,STCRID,STTITL,STSTTY From CSLSTT01 Where STCTYC = :County
where County is a program defined variable. How do I get the value in the County variable into the Select string? I tried concatenation but that didn't work either. Thanks.
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Jan 5, 2004
I create trigger no table person. When I invoke sql command
insert into person values (.... bla bala bal)
trigger is autommaticaly fired.
The trigger must log sql commads, so i must insert into table log this command, whos execute triger - insert into person values (.... bla bala bal).
How I can do it?
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Jan 29, 2004
Hi,
I have a query that I need to pass as a string as the second parameter of the OpenQuery method. Here's my query:
SELECT * FROM mytable WHERE last_name = 'DOE'
Thing is that a string is set with apostrophies, so I don't know how to set my string since apostrophies are alse in my query. Normally, it would look like this:
DECLARE @CQUERY VARCHAR(100)
SET @CQUERY = 'SELECT * FROM mytable WHERE last_name = 'DOE''
But of course this fails. How can I do it then?
Thanks,
Skip.
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Feb 5, 2004
How can I output the result of a query in a text file.
(I want to use SP)
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