SQL Views And Testing For Nulls
Jul 6, 2004
Pop quiz hotshots:
I am creating a View in SQL2000 where i concatenate values from multiple tables. My problem is that if one of the values is null then the whole string is null, so I would like to know how to test for nulls within the Select part if the View.
Select
Titles.Title + ' ' + User.Forename + ' ' + User.Surname AS FullName,
For example;
If User.Forename is null, I still want to return Titles.Title and User.Surname as a concatenated string.
I’ve tried I few things like places if statements within the Select part but I can’t get it to work.
Many thanks
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Feb 17, 2008
is there an elegant way to use one equals sign in a where clause that returns true when both arguments are null, and returns true when neither is null but both are equal and returns false when only one is null?
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Jul 7, 2005
Hi all,
I have some C# code that is pulling data from a database where a majority of the values being retrieved are NULL , yet their initial column data types are both string and int, which means that I have to temporarily store these NULL's in int and string data
types in C#. Later on in my code I have to test against these values,
and was wondering if I am doing it correctly with the following code.
The following statement the variable or_team_home_id is of a string data type, but may have had a NULL value assigned to it from the database
if (!or_team_home_id.Equals(DBNull.Value)) {}
The following statement the variable or_manager_id is of a int data type, but also may have a NULL value assigned to it from the database.
if (!Convert.IsDBNull(or_manager_id)){}
Are these the correct way to test against NULL values retrieved from
teh database and that are stored in their respective data types.
Tryst
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May 16, 2006
When i do a select on my emplee table for rows with null idCompany i dont get any records
I then try to modify the table to not allow a null idCompany and i get this error message:
'Employee (aMgmt)' table
- Unable to modify table.
Cannot insert the value NULL into column 'idCompany', table 'D2.aMgmt.Tmp_Employee'; column does not allow nulls. INSERT fails.
The statement has been terminated.
This sux
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May 15, 2008
I have two SSIS packages that import from the same flat file into the same SQL 2005 table. I have one flat file connection (to a comma delimited file) and one OLE DB connection (to a SQL 2005 Database). Both packages use these same two Connection Managers. The SQL table allows NULL values for all fields. The flat file has "empty values" (i.e., ,"", ) for certain columns.
The first package uses the Data Flow Task with the "Keep nulls" property of the OLE DB Destination Editor unchecked. The columns in the source and destination are identically named thus the mapping is automatically assigned and is mapped based on ordinal position (which is equivalent to the mapping using Bulk Insert). When this task is executed no null values are inserted into the SQL table for the "empty values" from the flat file. Empty string values are inserted instead of NULL.
The second package uses the Bulk Insert Task with the "KeepNulls" property for the task (shown in the Properties pane when the task in selected in the Control Flow window) set to "False". When the task is executed NULL values are inserted into the SQL table for the "empty values" from the flat file.
So using the Data Flow Task " " (i.e., blank) is inserted. Using the Bulk Insert Task NULL is inserted (i.e., nothing is inserted, the field is skipped, the value for the record is omitted).
I want to have the exact same behavior on my data in the Bulk Insert Task as I do with the Data Flow Task.
Using the Bulk Insert Task, what must I do to have the Empty String values inserted into the SQL table where there is an "empty value" in the flat file? Why & how does this occur automatically in the Data Flow Task?
From a SQL Profile Trace comparison of the two methods I do not see where the syntax of the insert command nor the statements for the preceeding captured steps has dictated this change in the behavior of the inserted "" value for the recordset. Please help me understand what is going on here and how to accomplish this using the Bulk Insert Task.
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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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Jul 20, 2007
I have a website and database in Access, how do i set it up so i can test it in IIS using SQL server?
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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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May 21, 2008
I am using SqlServer 2005 Express Edition. I have written a stored procedure that has a transaction to make sure that it rolls back in case of failure. Is there a way to test that the transaction works. I don't now how to cause an error that would cause the transaction to roll back and raise the error with the details of the exception.
Thanks,
laura
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Dec 6, 2005
hello everyone i was hoping to get some help.
i have sql server2000 and iis5.1 running and im using vbscript through asp.
i have a table that has two keys so that together they make a unique key.
so i am trying to test my table in asp so that if there is a duplicate unique key inserted then show an
error...
Can anyone help me?
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Apr 13, 2001
I want to run remote procs from a local - central proc, but don't want to crash my proc if the remote NT Server or SQL Server is not available.
So, I want to test for NT and SQL availability first.
Here's my code.
====================
DECLARE
@DBName varchar(22),
@QueryString NVARCHAR(130),
@Resultsint,
@ResultsTxtvarchar(31)
/* I find the server-dbasename name in a lookup table, and then build dynamic script */
SELECT @DBName = "<SRVRNAME~DBASENAME>"
SELECT @QueryString = N'master..xp_cmdshell "ECHO >'
+ SUBSTRING(@DBName, 1,6)
+ 'pipesqlquery", no_output'
EXEC @Results = sp_executesql @QueryString
SELECT @Results /* <-- testing here.... */
=====================
If the NT / SQL is running, "@Results" should = 0 (success on the ECHO to the PIPE)
If the NT / SQL is NOT running, "@Results" should = 1 (error on the ECHO to the PIPE)
If I test in QA, I get the expected "@Results" values.
If I run the proc, I get "@Results" = 0 for both events, and them my proc fails on the remote proc call if the NT / SQL is NOT running.
I don't know how to write DMO in TSQL to try that.
I have also tried using 'odbcping' too.
HINTS? Better way to test remote NT / SQL is NOT running?
Thanks in advance.
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May 1, 2001
Hi,
Is there anyway to test the loadtesting/Stress testing on SQLSERVER. I wanted to executes a Store procedure with concurrent users.
Thanks
JK
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Dec 24, 2002
Anyone have a tool or script to run to test a SQL server under heavy stress?
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Mar 31, 2004
Hi,
I need help to test person's skills for
knowledge of SQL stored procedures
and DTS
Could someone point on good resources.
Thank you
Alex
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May 7, 1999
i have performed all the steps for the replication there are two problems i encounytring
(i) how to check whether the replication is working or not
(ii) can replication on the subscribing server automatically create the table which publishing server is publshing
(iii)please tell me someother forums for sql server
what my knowledge says that in replication if i modify the data at one place it should automatically be modified in the subscribing server but this thing is also not happening (its not flashing any error message as such)
please tell me what all things i need to do to make sure that everything starts working
waiting for reply
ashish bhatnagar
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Jan 15, 2007
Hi Guyz ,
I'm new to this forum and as well as new to OLAP testing . I would like to know OLAP testing and guidance for SQL server anlaysis services .
I have been trying install SQL server 2000 in my system but it not going through, Can anybody send information how to install SQL server and how to play with sample database.
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May 22, 2007
Has anyone ever heard of using Response.Write to test sql queries in the query designer? Here is the actual suggestion I was given recently:
Response.write your sql query. Copy the query to your db query tool and run the query. Adjust the query as necessary to return the recordset you desire. When you have the proper query, adjust your asp code.
The query editor/designer doesn't like certain symbols and extraneous code. So how exactly can you use Response.Write with a sql query without getting errors in designer?
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Jul 23, 2005
I've begun some testing with the June beta of SQL 2005. One problemI've hit is with scalar-valued functions. The error I often get whenexecuting functions is "Select statements included within a functioncannot return data to a client.". These same functions are workingfine under SQL 2000.Has anybody seen this behavior or know what the deal is?
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Oct 1, 2005
I've started researching on Unit Testing and I must admitI had never heard of Unit Testing until a couple of monthsago. Obviously I am interested in Unit Testing StoredProcedures.I read the TSQLUnit documentation (not all of it) and i also raninto a newsgroup post saying TSQLUnit is very small comparedto NUnit. The conclusion I am making out of this post is thatI should rather spend time resarching/reading about NUnit thanTSQLUnit. Is that a good assessment?I would like to you what you use and if you use actuallyUnit Testing or some other method? I ran into White Box/Black BoxQA testing. All these are new to me. Any good place to read about"Extreme Programming"? I ran into one link that I saved it at work.That's one place i will read more.Any links, documentation or books you would suggest?I searched Amazon and I didn't find anything interestingregarding SQL Server and Stored Procedures.Thank you
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May 25, 2006
I am running windows xp pro on my home computer and would like to test andatabase driven ASP .NET web application. I need to be able to create an SQLdatabase which will be assessed by the web application. I already have alocal IIS Server up and running.At work, I use SQL Enterprise Manager. I wanted to download it on my homecomputer but cannot find it anywhere on the net.How can I test my web applications at home on a person computer?Thanks.Jess
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Mar 31, 2008
Hi,How do I write a query where if a column, "value," is NULL I returnthe phrase "No value entered" but otherwise return the column's value,even if it is the empty string? I'm tried to modify this simple querySELECT value FROM meta_dataThanks, - Dave
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Feb 20, 2008
can any one guide me how should i do performance testing on database size for sql server.
I dont know how to read the execution plan, though i have read many document but still i am not clear.
For are the reports which shows the performance has been down and its all accurate.
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Jun 20, 2005
Well was wondering this weekend. How do you do unit testing with SSIS? Is anyone trying it?
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Feb 6, 2006
Is it possible to get a list of all the fixes and enhancements that are going into SP1 for SSIS? This will make it alot easier to test seeing as we will know what we are looking for.
Regards
-Jamie
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Aug 31, 2007
Hello Everyone
I am new to replication but i am into a project to test Transactional replication process , do anyone have any experience in this
If possible plz let me know what section i need to test .
Thanks in advance
Karthik
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Sep 13, 2006
How do I test failover to point to the mirrored database instead of the principal without having to stop the primary instance? I would like to just bring the mirrored database on the primary instance to an offline status and see that the same database on the mirrored instance getting activated as the primary. This does not happen if I try to put the database on the primary server "offline" as it complains that any database that is being mirrored cannot be taken offline.
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Nov 23, 2007
At the moment, the only way (that I know of) to test a subscription seems to be to schedule it a few minutes ahead in time and wait for it to happen. Dies nayone know if there are plans for and "Execute" or "tTst" button? It would be nice to have one.
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Aug 1, 2007
i've been informed that one way to test a query is to execute and roll-back it back as a transaction. my question is the following: using the aforementioned mechanism, how can i examine the database state before the query is rolled-back?
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Jan 15, 2007
How does one determine in a VS load test the exact limit of the number of users the report server can handle without failing?
If 200 users proces request reports simultaneously, what is the best configuration for a single box deployment. The reports are parametrized reports and do not run from cache.
Thanks
Inder
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Jan 16, 2008
hi every one
can any one please explain me how to test manually SSIS packages
thanks in advance
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