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• SQL - Break a start/end time into 15 minute records

  - by Chu

  I've got a record set that consists of a start and end time in two separate fields: id - Int startTime - DateTime endTime - DateTime I'd like to find a way to query a record and return it as X records based on the number of 15 minute intervals found between the start and end times. For example, let's say I have a record like this: id, StartTime, EndTime 1, 1/1/2010 8:28 AM, 1/1/2010 8:47 AM I would return 3 records, the first would represent the 8:15 interval, #2 for the 8:30 interval and then a 3rd for the 8:45 interval. I realize this could be done using logic in an sproc, but we are trying to remain db neutral as we support multiple database engines.

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• Trouble Passing Parameter to LinqToSql Stored Procedure

  - by Webjedi

  public IEnumerable<T> ExecuteStoredProcedure<T>(params object[] parameters) { Type genericType = typeof(T); string commandthing = genericType.Name.Replace("Result", ""); //_db is my Linq To Sql database return _db.ExecuteQuery<T>(commandthing, parameters).AsEnumerable(); } The stored procedure is named GetOrder and has a single int parameter of orderid. I'm calling the above like so: SqlParameter parm1 = new SqlParameter("@orderid", SqlDbType.Int); parm1.Value = 123; var results = _session.ExecuteStoredProcedure<GetOrderResult>(parm1).Single(); I'm receiving the following error: A query parameter cannot be of type 'System.Data.SqlClient.SqlParameter' Thoughts? Or am I just missing something obvious?

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• Comparing two dates in .Net using Access mdb strange error..

  - by Markive

  SELECT * FROM Orders WHERE [DateSync] > #2010-11-10 03:11:00# this works if you run the query from in MS Access but if you get .net to submit it like this... Dim adapter1 As New OleDbDataAdapter adapter1.SelectCommand = New OleDbCommand(sSQL, conn) Dim table1 As New DataTable connection1.Open() Try adapter1.Fill(table1) Catch ex As Exception 'will error here Finally 'conn.Close() End Try it throws an error.... "No value given for one or more required parameters." Source="Microsoft JET Database Engine" Any help much appreciated.

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• Google App Engine & Django Sandbox: Shell and Web seem to be using different datastores?

  - by tones

  I'm new to both Django and Google App Engine, and am using a sandbox in OSX10.6 with the GoogleAppEngineLauncher. I've got a basic "bookstore" application running from the tutorial in the OReilly "Programming Google App Engine" book. Here's the bug: If I add a new object to the datastore through the web interface, then it's readable through the web interface, but does not appear to exist if I query the datastore through the shell. Vice versa: If I add an object in the shell, then I can read it from the shell, but it doesn't appear in the web interface. Any thoughts or theories would be welcome. Thanks! =T=

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• Include only the latest/newest associated record with active record?

  - by railsnewbie

  is it possible to load only the latest associated record of an associated table? an example: class author attr_accessible :first_name, :last_name, :birthday has_many :books end class book attr_accessible :pages, :date of publication, :title belongs_to :author end Is there a way to generate a scope to load only the newest released book the author wrote? Or the book with the most pages? I know, that I could include or join all books. But I don't know if its possible to load only a specific book for each author. So that I could do a query like this: Author.authors_and_their_newest_book So that I could get these results first_name_author_1, last_name_author_1, birthday_author_1, pages_book_3, date of publication_book_3, title_book_3 first_name_author_2, last_name_author_2, birthday_author_2, pages_book_5, date of publication_book_5, title_book_5 first_name_author_3, last_name_author_3, birthday_author_3, pages_book_9, date of publication_book_9, title_book_9 ...

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• retrieving data from memcache

  - by Adnan

  Hello, I am starting to learn the benefits of memcache, and would like to implement it on my project. I have understood most of it, such as how data can be retrieved by a key and so on. Now I get it that I can put a post with all of its details in memcache and call the key POST:123, that is OK, and I can do it for each post. But how to deal with the case when I query the table posts to get the list of all posts with their titles. Can this be done with memcache, or should this always be queried from the table?

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• Stored procedure for selecting multiple records

  - by padmavathi

  I need to select records say 2000 from a table with a matching timestamp from c# .net code. Eg: SELECT * FROM ITEMDATA_TABLE WHERE ITEMNAME='Item1' and TimeStamp='2010-04-26 17:15:05.667' The above query has to execute for 2000 items more for the same timestamp. for this we can use SELECT * FROM ITEMDATA_TABLE WHERE ITEMNAME in ('Item1','Item2','Item3','Item4',......) AND TimeStamp='2010-04-26 17:15:05.667' from SQL Server Management Studio. I have tried appending all Item names to one string variable and giving it as a parameter to the stored procedure,but it resulted into a wrong concatenation. How can I do this as a stored procedure executing from the .net code? Can anyone suggest me/correct me in doing this? Thanks & Regards Padma

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• SQL Server 2008 - Get Latest Record from Joined Table

  - by user336786

  Hello, I have a SQL Server 2008 database. This database has two tables called Customer and Order. These tables are defined as follows: Customer -------- ID, First Name, Last Name Order ----- ID, CustomerID, Date, Description I am trying to write a query that returns all of the customers in my database. If the user has placed at least one order, I want to return the information associated with the most recent order placed. Currently, I have the following: SELECT * FROM Customer c LEFT OUTER JOIN Order o ON c.[ID]=o.[CustomerID] As you can imagine, this will return all of the orders associated with a customer. In reality though, I only want the most recent one. How do I do this in SQL? Thank you!

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• File download using Java, Struts 2 and AJAX

  - by amar4kintu

  Hello Friends, I want to give file download using java,struts2 and ajax. On my html page there is a button called "export" clicking on which ajax call will be made which will execute a query and will create .xls file using code and I want to give that file for download to user without storing it on hard drive. Does any one know how to do that using struts2 and ajax in java? Is there any example available? Let me know if you need more details from me... Thanks. amar4kintu

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• Using regular expressions with Dojo data.fetch?

  - by Dfowj

  I'm trying to use the below code to fetch a regular expression like this /[computer]{3,8}/(what i think is any words containing the letters in computer ranging from 3 to 8 letters long) from a database (which i know is being loaded correctly). When i fetch, i get 10 results, all the same word... "Adenauer" var base = "computer"; var baseRE = '/[' + base + ']{' + this.minLength + ',' + base.length + '}/'; this.dict.fetch({query: {word:baseRE}, onComplete: onLoadWords, onError: function(err) { console.log(err); }}); Any ideas what im doing wrong?

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• Scheduled cron job to check for pending activity

  - by luckytaxi

  Using PHP ... This is for my personal use so I'm thinking maybe 3-4 emails a day. I'm at a point where I can send an email to a dedicated email address where my script parses the message and stores it into a DB. Now, I need to figure out the best way to check the records in the DB for any upcoming task. I feel like I'm missing something, maybe like a trigger field as to when a reminder should go out. However, that's not a concern to me at the moment since I'll just send an alert 15 mins prior to the due date. Question is, shoudl I run a cron job that queries the DB every minute? I take it the query will have to say something like "select all tasks that is due within 15 minutes."

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• Dynamic access to tables from another database inside an user function

  - by Alberto Martinez

  I have an user defined table function in SQL Server that aggregate data from several tables including a couple of tables of another database. That is done hardcoding the name of the database in the queries, but we want to make the database name configurable (because our databases usually share the server with the databases of other applications). I tried to construct a dynamic query string inside the function using the database name that is stored in a configuration table, but: When I tried exec(@sqlStatement) SQL Server said that execute string is not allowed inside a function. Then I tried exec sp_executesql @sqlStatement and the function was created, but when you execute it SQL Server says that inside a function you can only run extended functions and procedures. So the question is: is possible create a function or stored procedure that access a table in another database without having to recreate the function when the database name is different? TIA.

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• Delay and Inconsistent results using Twitter search API when using "since_id" parameter.

  - by benr

  Hi. We've noticed what seems to be a delay and/or inconsistent results using the Twitter Search API when specifying a sinceid in the param clause. For example: http://search.twitter.com/search?ors=%23b4esummit+@b4esummit+b4esummit&q=&result_type=recent&rpp=100&show_user=true&since_id= Will give the most recent Tweets, but: http://search.twitter.com/search?ors=%23b4esummit+@b4esummit+b4esummit&q=&result_type=recent&rpp=100&show_user=true&since_id= 12642940173 will often not give tweets that are after that ID for several hours (even though they're visible in the first query)... anyone have similar problems?

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• How to map one class against multiple tables with SQLAlchemy?

  - by tote

  Lets say that I have a database structure with three tables that look like this: items - item_id - item_handle attributes - attribute_id - attribute_name item_attributes - item_attribute_id - item_id - attribute_id - attribute_value I would like to be able to do this in SQLAlchemy: item = Item('item1') item.foo = 'bar' session.add(item) session.commit() item1 = session.query(Item).filter_by(handle='item1').one() print item1.foo # => 'bar' I'm new to SQLAlchemy and I found this in the documentation (http://www.sqlalchemy.org/docs/05/mappers.html#mapping-a-class-against-multiple-tables): j = join(items, item_attributes, items.c.item_id == item_attributes.c.item_id). \ join(attributes, item_attributes.c.attribute_id == attributes.c.attribute_id) mapper(Item, j, properties={ 'item_id': [items.c.item_id, item_attributes.c.item_id], 'attribute_id': [item_attributes.c.attribute_id, attributes.c.attribute_id], }) It only adds item_id and attribute_id to Item and its not possible to add attributes to Item object. Is what I'm trying to achieve possible with SQLAlchemy? Is there a better way to structure the database to get the same behaviour of "dynamic columns"?

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• How to select first entry of the day grouped by user in SQL

  - by mikepreble

  I've looked around and can't quite grasp the whole answer to this SQL query question needed to extract data from an MS Access 2000 table. Here's an example of what the table [Time Sub] looks like: CLIENT_ID, DATE_ENTERED, CODE, MINUTES 11111, 5/12/2008 3:50:52 PM, M, 38 11111, 5/12/2008 2:55:50 PM, M, 2 11714, 5/13/2008 1:15:32 PM, M, 28 11111, 5/13/2008 6:15:12 PM, W, 11 11112, 5/12/2008 2:50:52 PM, M, 89 11112, 5/12/2008 5:10:52 PM, M, 9 91112, 5/14/2008 1:10:52 PM, L, 96 11112, 5/12/2008 5:11:52 PM, M, 12 I need to select the first entry of each day per client that's NOT code L or W. I know this can be done in a SQL statement, but I just can't figure out how. I can get close, but never come up with the right output. Any help is appreciated. Thanks, Mike

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• Count number of results in a View

  - by Jukebox

  I need to count how many people belong in pre-defined groups (this is easy to do in SQL using the SELECT COUNT statement). My Views query runs fine and displays the actual data in my table, but I simply need to know how many results it found. However there doesn't seem to be a COUNT option in views. I am guessing I am going to have to use some sort of views hook, and then stick the result in the table. Here's a quick example of what i'm trying to achieve: My Table ---------------------- Group A | 20 people Group B | 63 people and so on. (I've tried using the Views_Calc module, but I get errors because it is not quite stable yet.) Anybody know of an easy way to count results in Views?

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• How can I handle this kind of exceptions (in Doctrine)

  - by ppavlovic

  Can you tell me how can I handle this kind of exceptions: Fatal error: Uncaught exception 'Doctrine_Connection_Exception' with message 'PDO Connection Error: SQLSTATE[HY000] [2013] Lost connection to MySQL server at 'reading initial communication packet', system error: 110' in ... It happens when connection with MySQL is lost during query. I need to handle this exception so I can show 500 error page so the crawlers do not cache page, and to redirect user to appropriate "Try again" page. P.S. I have a lot's of code, so I can not go trough all code to put try/catch block. I need something simple and yet effective.

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• How to limit results by SUM

  - by superspace

  I have a table of events called event. For the purpose of this question it only has one field called date. The following query returns me a number of events that are happening on each date for the next 14 days: SELECT DATE_FORMAT( ev.date, '%Y-%m-%d' ) as short_date, count(*) as date_count FROM event ev WHERE ev.date >= NOW() GROUP BY short_date ORDER BY ev.start_date ASC LIMIT 14 The result could be as follows: +------------+------------+ | short_date | date_count | +------------+------------+ | 2010-03-14 | 1 | | 2010-03-15 | 2 | | 2010-03-16 | 9 | | 2010-03-17 | 8 | | 2010-03-18 | 11 | | 2010-03-19 | 14 | | 2010-03-20 | 13 | | 2010-03-21 | 7 | | 2010-03-22 | 2 | | 2010-03-23 | 3 | | 2010-03-24 | 3 | | 2010-03-25 | 6 | | 2010-03-26 | 23 | | 2010-03-27 | 14 | +------------+------------+ 14 rows in set (0.06 sec) Let's say I want to dislay these events by date. At the same time I only want to display a maximum of 10 at a time. How would I do this? Somehow I need to limit this result by the SUM of the date_count field but I do not know how. Anybody run into this problem before? Any help would be appreciated. Thanks

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• How to use Externel Procedures in Triggers on Oracle 11g..

  - by RBA

  Hi, I want to fire a trigger whenever an insert command is fired.. The trigger will access a pl/sql file which can change anytime.. So the query is, if we design the trigger, how can we make sure this dynamic thing happens.. As during the stored procedure, it is not workingg.. I think - it should work for 1) External Procedures 2) Execute Statement Please correct me, if I am wrong.. I was working on External Procedures but i am not able to find the way to execute the external procedure from here on.. SQL> CREATE OR REPLACE FUNCTION Plstojavafac_func (N NUMBER) RETURN NUMBER AS 2 LANGUAGE JAVA 3 NAME 'Factorial.J_calcFactorial(int) return int'; 4 / @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ SQL> CREATE OR REPLACE TRIGGER student_after_insert 2 AFTER INSERT 3 ON student 4 FOR EACH ROW How to call the procedure from heree... And does my interpretations are right,, plz suggest.. Thanks.

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• PHP, MySQL - would results-array shuffle be quicker than "select... order by rand()"?

  - by sombe

  I've been reading a lot about the disadvantages of using "order by rand" so I don't need update on that. I was thinking, since I only need a limited amount of rows retrieved from the db to be randomized, maybe I should do: $r = $db->query("select * from table limit 500"); for($i;$i<500;$i++) $arr[$i]=mysqli_fetch_assoc($r); shuffle($arr); (i know this only randomizes the 500 first rows, be it). would that be faster than $r = $db->("select * from table order by rand() limit 500"); let me just mention, say the db tables were packed with more than...10,000 rows. why don't you do it yourself?!? - well, i have, but i'm looking for your experienced opinion. thanks!

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• How to do comments in Activity Stream? (like Facebook)

  - by fesja

  Hi, I'm starting to develop an activity stream. I've read both How to implement the activity stream in a social network and What’s the best manner of implementing a social activity stream?. What I haven't found is the best way to add comments to the activities. As in facebook, each comment can be commented by another person. If each activity comment is saved as another activity, then I would not be able to get the activity of that comment without doing a query. So the solution I'm thinking is to save the comments inside the serialize data field of each activity. If the user wants to delete his comment, I would have to update that activity. Is this the correct solution? Is there a better approach? Thanks!

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• Find the period of over speed ?

  - by Vimvq1987

  Just something interesting come in my mind. Assume that we have a table (in SQL Server) like this: Location Velocity Time What is the best way to determine over speed periods (speed barrier is defined) ? My first idea was loading the table into an array, and then iterate over array to find these periods: (Pseudo C# code) bool isOverSpeed = false; for (int i =0;i<arr.Length;i++) { if (!isOverSpeed) if (arr[i].Velocity > speedBarrier) { #insert the first record into another array. isOverSpeed = true; } if(isOverSpeed) if (arr[i].Velocity < speedBarrier) { #insert the record into that array isOverSpeed = false; } } It works, but somewhat "not very effectively". Is there a "smarter" way, such as a T-SQL query or another algorithm to do this?

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• C++ Access variable value using string representing variable's name

  - by Paul Ridgway

  Hello everyone, If the title was not clear, I will try to clarify what I am asking: Imagine I have a variable called counter, I know I can see its current value by doing something like: std::cout << counter << std::endl; However, assume I have lots of variables and I don't know which I'm going to want to look at until runtime. Does anyone know a way I can fetch the value of a variable by using its name, for example: std::cout << valueOf("counter") << std::endl; I feel being able to do this might make debugging large complex projects easier. Thanks in advance for your time. PS: Please do not respond with 'Google it', I have, though maybe not with the best query to get the answer I'm looking for...

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• How to get tag parameter value with XQuery

  - by uni

  For example i have this xml. I need to get value of parameter val of tag foo with id="two" <top> <sub id="one"> <foo id="two" val="bar" /> sometext </sub> </top> Whis this query (using Qt QXmlQuery): doc('test.xml')/top/sub[@id='one']/foo[@id='two']/<p>{@val}</p> I receive <p val="bar"/>, but I need only text "bar" without any tags. I tried to remove <p> and </p> and receive syntax error, unexpected { How can i get parameter value without any tags?

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• how to sort an existing table in greasemonkey ?

  - by user570512

  i'm writing a greasemonkey user.js for a page with a table in it. (table is 100 rows by 18 columns.) now what i want to do is to make it sortable on column. and also have it run in both chrome and firefox. all searches for answers sofar resulted in suggestions to use jquery/dojo or something alike. can i be done without any external code? after all it's just a matter of replacing the row's in a different order, right? or is that a silly thing to say? the thing is that i'm already using dojo for some query needs but since i want it to run in both firefox and chrome, i just copy paste the whole dojo thing in my script.. also, most of the solutions i found sofar seem to be more for use when building a table. not for altering an existing one. any help is appreciated.

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