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• Set query FROM table using report parameter in BIRT

  - by Adam

  Hi, I am using the BIRT report writer, and I have multiple tables with the same data structure. In my report design, I want to select the table my query uses as a report parameter (as part of a mysql query in the data set) -- but I can't figure it out. When I create the data set, it's great that I can use parameters in the form of SELECT * FROM WHERE ?, and set these to report parameters, but I get an error if I set the ? to the table, such as: SELECT * FROM ? WHERE 1 Is there another way I can do this? As it's java, I assume the syntax follows that of a PreparedStatement. In BIRT 2.5 there is a property binding option under the data set dialog... and I've tried setting my query as: "SELECT * FROM "+params["DataTable"].value+" WHERE 1", but that was also results in an error.

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• How to dynamically choose two fields from a Linq query as a result

  - by Dr. Zim

  If you have a simple Linq query like: var result = from record in db.Customer select new { Text = record.Name, Value = record.ID.ToString() }; which is returning an object that can be mapped to a Drop Down List, is it possible to dynamically specify which fields map to Text and Value? Of course, you could do a big case (switch) statement, then code each Linq query separately but this isn't very elegant. What would be nice would be something like: (pseudo code) var myTextField = db.Customer["Name"]; // Could be an enumeration?? var myValueField = db.Customer["ID"]; // Idea: choose the field outside the query var result = from record in db.Customer select new { Text = myTextField, Value = myValueField };

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• Optimising SQL distance query

  - by Alex

  I'm running an MySQL query that returns results based on location. However I have noticed recently that its really slowing down my PHP app. I used CodeIgniter and the profiler shows the query taking 4.2seconds. The geoname table has 500,000 rows. I have some indexes on the key columns, how else can speed up this query? Here is my SQL: SELECT `products`.`product_name`, `geoname`.`geonameid`, `geoname`.`latitude`, `geoname`.`longitude`, `products`.`product_id`, AVG(ratings.vote) as rating, count(comments.comment_id) as total_comments, (6371 * acos(cos(radians(38.7666667)) * cos(radians(geoname.latitude)) * cos(radians(geoname.longitude) - radians(-3.3833333)) + sin(radians(38.7666667)) * sin(radians(geoname.latitude)))) AS distance FROM (`foods`) JOIN `geoname` ON `geoname`.`geonameid` = `products`.`geoname_id` LEFT JOIN `ratings` ON `ratings`.`var_id` = `products`.`product_id` LEFT JOIN `comments` ON `comments`.`var_id` = `products `.`product_id` WHERE `products`.`product_id` != 82 GROUP BY `products`.`product_id` HAVING `distance` < 99 ORDER BY `distance` LIMIT 10

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• Django query: Count and Group BY

  - by Tyler Lane

  I have a query that I'm trying to figure the "django" way of doing it: I want to take the last 100 calls from Call. Which is easy: calls = Call.objects.all().order_by('-call_time')[:100] However the next part I can't find the way to do it via django's ORM. I want to get a list of the call_types and the number of calls each one has WITHIN that previous queryset i just did. Normally i would do a query like this: "SELECT COUNT(id),calltype FROM call WHERE id IN ( SELECT id FROM call ORDER BY call_time DESC LIMIT 100 ) GROUP BY calltype;" I can't seem to find the django way of doing this particular query. Here are my 2 models: class Call( models.Model ): call_time = models.DateTimeField( "Call Time", auto_now = False, auto_now_add = False ) description = models.CharField( max_length = 150 ) response = models.CharField( max_length = 50 ) event_num = models.CharField( max_length = 20 ) report_num = models.CharField( max_length = 20 ) address = models.CharField( max_length = 150 ) zip_code = models.CharField( max_length = 10 ) geom = models.PointField(srid=4326) calltype = models.ForeignKey(CallType) objects = models.GeoManager() class CallType( models.Model ): name = models.CharField( max_length = 50 ) description = models.CharField( max_length = 150 ) active = models.BooleanField() time_init = models.DateTimeField( "Date Added", auto_now = False, auto_now_add = True ) objects = models.Manager()

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• mysql query performance help

  - by Stefano

  Hi I have a quite large table storing words contained in email messages mysql> explain t_message_words; +----------------+---------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------------+---------+------+-----+---------+----------------+ | mwr_key | int(11) | NO | PRI | NULL | auto_increment | | mwr_message_id | int(11) | NO | MUL | NULL | | | mwr_word_id | int(11) | NO | MUL | NULL | | | mwr_count | int(11) | NO | | 0 | | +----------------+---------+------+-----+---------+----------------+ table contains about 100M rows mwr_message_id is a FK to messages table mwr_word_id is a FK to words table mwr_count is the number of occurrencies of word mwr_word_id in message mwr_message_id To calculate most used words, I use the following query SELECT SUM(mwr_count) AS word_count, mwr_word_id FROM t_message_words GROUP BY mwr_word_id ORDER BY word_count DESC LIMIT 100; that runs almost forever (more than half an hour on the test server) mysql> show processlist; +----+------+----------------+--------+---------+------+----------------------+----------------------------------------------------- | Id | User | Host | db | Command | Time | State | Info +----+------+----------------+--------+---------+------+----------------------+----------------------------------------------------- processlist | 41 | root | localhost:3148 | tst_db | Query | 1955 | Copying to tmp table | SELECT SUM(mwr_count) AS word_count, mwr_word_id FROM t_message_words GROUP BY mwr_word_id | +----+------+----------------+--------+---------+------+----------------------+----------------------------------------------------- 3 rows in set (0.00 sec) Is there anything I can do to "speed up" the query (apart from adding more ram, more cpu, faster disks)? thank you in advance stefano

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• Sqlalchemy+elixir: How query with a ManyToMany relationship?

  - by Hugo

  Hi, I'm using sqlalchemy with Elixir and have some troubles trying to make a query.. I have 2 entities, Customer and CustomerList, with a many to many relationship. customer_lists_customers_table = Table('customer_lists_customers', metadata, Column('id', Integer, primary_key=True), Column('customer_list_id', Integer, ForeignKey("customer_lists.id")), Column('customer_id', Integer, ForeignKey("customers.id"))) class Customer(Entity): [...] customer_lists = ManyToMany('CustomerList', table=customer_lists_customers_table) class CustomerList(Entity): [...] customers = ManyToMany('Customer', table=customer_lists_customers_table) I'm tryng to find CustomerList with some customer: customer = [...] CustomerList.query.filter_by(customers.contains(customer)).all() But I get the error: NameError: global name 'customers' is not defined customers seems to be unrelated to the entity fields, there's an special query form to work with relationships (or ManyToMany relationships)? Thanks

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• .NET: Preserving some, but not all query params during redirect

  - by kasper pedersen

  Hi all, Could someone tell me if the code below would achieve what I want, which is: Check if the query parameters 'return_path' and/or 'user_state' are present in the query string, and if so append them to the query string of the redirect URI. As I'm not a .NET dev and don't have a server to test this on, I was hoping someone could give me some feedback. ArrayList vars = new ArrayList(); vars.Add("return_path"); vars.Add("user_state"); string newUrl = "/new/request/uri" + "?"; ArrayList params = new ArrayList(); foreach ( string key in Request.QueryString ) { if (vars.contains(key)) { params.Add(key + "=" + HttpUtility.URLPathEncode(Request.QueryString[key])); } } String[] paramArr = (String[]) params.ToArray( typeof (string) ); String queryString = String.join("&", paramArr); Response.Redirect(newUrl); Thank you :)

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• SQL Query syntax, I want to use INNER JOIN

  - by amol kadam

  Hi . I'm working on a windows application project using front end "vb.net" & back end "Ms Access" I have problem in wrinting sql query Actually there are 5 tables Transaction,items,itemtitle,itemtype & userinfo. check the following query & with this referance if u get idea then plz change in correct query Thanking You SELECT TRANSACTIONS.ACCESSIONNO AS ACCESSIONNO,TRANSACTIONS.TYPEID, TRANSACTIONS.CHECKOUTDATE AS CHECKOUTDATE,ITEMTITLE.ITEMTITLE, TRANSACTIONS.CHECKEDOUTBY, USERINFO.FULLNAME_ENG, USERINFO.FULLNAME_MAR, TRANSACTIONS.ACCOUNTNO, ITEMTYPE.TYPES_MAR, ITEMTYPE.TYPES_ENG FROM TRANSACTIONS,ITEMTYPE, ITEMTITLE, USERINFO WHERE TRANSACTIONS.ACCOUNTNO=USERINFO.ACCOUNTNO AND TRANSACTIONS.ACCESSIONNO=ITEMS.ACCESSIONNO AND ITEMS.ITEMTITLEID=ITEMTITLE.ITEMTITLEID AND TRANSACTIONS.TYPEID=ITEMTYPE.TYPEID AND TRANSACTIONS.STATUS='Enabled'

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• Connection Timeout exception for a query using ADO.Net

  - by dragon

  Update: Looks like the query does not throw any timeout. The connection is timing out. This is a sample code for executing a query. Sometimes, while executing time consuming queries, it throws a timeout exception. I cannot use any of these techniques: 1) Increase timeout. 2) Run it asynchronously with a callback. This needs to run in a synchronous manner. please suggest any other techinques to keep the connection alive while executing a time consuming query? private static void CreateCommand(string queryString, string connectionString) { using (SqlConnection connection = new SqlConnection( connectionString)) { SqlCommand command = new SqlCommand(queryString, connection); command.Connection.Open(); command.ExecuteNonQuery(); } }

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• Help with query

  - by hdoe123

  Hi, I'm trying make a query that looks at a single table and looks to see if a student is a team called CMHT and in a medic team - if they are I don't want to see the result. I only want see if there only in CMHT or medic not both. Would the right direction be using sub query to filer it out? I've done a search on NOT IN but how could you get to see check if its in more then 2 teams are not? Student Team ref 1 CMHT 1 1 Medic 2 2 Medic 3 this would be in the result 3 CMHT 5 this would be in the result So far I've done the following code would I need use a sub query or do a self join and filter it that way? SELECT Table1.Student, Table1.Team, Table1.refnumber FROM Table1 WHERE (((Table1.Team) In ('Medics','CMHT'))

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• Odd results when searching for numbers using IXSSO.Query

  - by Vic

  Hi, from classic asp on Windows 2008, using an IXSSO.Query, when searching for a string of numbers, for example 10000000001, I receive results that also include variations to this, like 10000000002 10000000003 and so on. If I change the first digit so the search string is 20000000001 I dont get anything. If I keep moving the last digit from my first example to the left, I keep getting hits until I reach the half way point when I get no results! So in other words 10000020000 will return results like in the first example but 10000200000 does not. This all sounds like to me that its doing a match on the first 6 characters and it ignores the rest... Here is relevant parts of the Set oQuery = Server.CreateObject("IXSSO.Query") oQuery.Catalog = SEARCH_CATALOG oQuery.Query = "@all " & searchstr Set oRS = oQuery.CreateRecordset("nonsequential") Anyone got any ideas and/or suggestions? Thanks, Vic.

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• LIKE query for DateTime in NHibernate

  - by Anry

  For a column of type varchar I could write such a query: public IList<Order> GetByName(string orderName) { using (ISession session = NHibernateHelper.OpenSession()) { return session.CreateCriteria<Order>(). Add(Restrictions.Like("Name", string.Format("%{0}%", orderName))). List<Order>(); } } How do I write a similar LIKE-query for a column that has type datetime? public IList<Order> GetByDateTime(DateTime dateTime) { using (ISession session = NHibernateHelper.OpenSession()) { return //LIKE-query } } That is, if the method is passed the date and part-time (eg "25.03.2010 19"), then displays all orders are carried out in this period of time.

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• SQL Server: export data via SQL query?

  - by rlb.usa

  I have FK and PK all over my db and table data needs to be specified in a certain order or else I get FK/PK insertion errors. I'm tired of executing the wizard again and again to transfer data one table at a time. In the SQL Server export data wizard there is an option to "Write a query to specify the data to transfer". I'd like to write the query myself and specify the correct order. Will this solve my problem? How do I do this? Can you provide a sample query (or link to one) The databases are on two different servers - SQL Server 2008 on each ; The database names & permissions are the same ; each table name & col is the same ; I need Identity Insert for each table.

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• SQLce Select query problem

  - by DieHard

  Wrote a Truck show Contest voting app, financial etc using sqlite. decided to write backup app for show day using ce 3.5. Created db moved to data directory, created tables configured dgridviews all is well. Entered some test data started management studio 08 ran select query against table and got null returns. Started app from vs studio and found that test data is gone. Re entered data ran query in MS data gone again. If I use VS Studio can start and enter data, close app restart and data is still there, seems only when using outside tool on select query data deletes. I don't know ce that well but this cannot be right. select * from votes = delete * from votes??????????????

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• How to get lng lat value from query results of geoalchemy2

  - by user2213606

  For exammple, class Lake(Base): __tablename__ = 'lake' id = Column(Integer, primary_key=True) name = Column(String) geom = Column(Geometry('POLYGON')) point = Column(Geometry('Point')) lake = Lake(name='Orta', geom='POLYGON((3 0,6 0,6 3,3 3,3 0))', point="POINT(2 9)") query = session.query(Lake).filter(Lake.geom.ST_Contains('POINT(4 1)')) for lake in query: print lake.point it returned <WKBElement at 0x2720ed0; '010100000000000000000000400000000000002240'> I also tried to do lake.point.ST_X() but it didn't give the expected latitude neither What is the correct way to transform the value from WKBElement to readable and useful format, say (lng, lat)? Thanks

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• Need help with SQL query on SQL Server 2005

  - by Avinash

  We're seeing strange behavior when running two versions of a query on SQL Server 2005: version A: SELECT otherattributes.* FROM listcontacts JOIN otherattributes ON listcontacts.contactId = otherattributes.contactId WHERE listcontacts.listid = 1234 ORDER BY name ASC version B: DECLARE @Id AS INT; SET @Id = 1234; SELECT otherattributes.* FROM listcontacts JOIN otherattributes ON listcontacts.contactId = otherattributes.contactId WHERE listcontacts.listid = @Id ORDER BY name ASC Both queries return 1000 rows; version A takes on average 15s; version B on average takes 4s. Could anyone help us understand the difference in execution times of these two versions of SQL? If we invoke this query via named parameters using NHibernate, we see the following query via SQL Server profiler: EXEC sp_executesql N'SELECT otherattributes.* FROM listcontacts JOIN otherattributes ON listcontacts.contactId = otherattributes.contactId WHERE listcontacts.listid = @id ORDER BY name ASC', N'@id INT', @id=1234; ...and this tends to perform as badly as version A.

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• Materialized Query Table in SQL Server 2005

  - by Azho KG

  In DB2 there is a support for Materialized Query Table (MQT). Basicly you write a query and create a MQT. But the difference from View is that the query is pre-executed and resulting data is stored in MQT and there are some options when to refresh/syncronize the MQT with base tables. I want same functionality in SQL Server. Is there a way to achieve same result? I've tables with millions of rows, and I want to show summary (like total # of members, total expense and etc) in dashboard. So I don't want to count every time user gets to dashboard, instead I want to store them in table and I want that table to be refresh each night. Any kind of hints, answers,suggestions and ideas are welcome. Thanks.

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• WSSQL query for multiple computers at once

  - by Josh

  I can run normal searches just fine. Windows 7 won't let me add a network share to my local index, but I can query the remote index just fine. The problem is that I can't find a way to query two indexes at once. I was hoping that something like this would work: SELECT System.ItemName FROM compA.SystemIndex, compB.SystemIndex WHERE SCOPE='file://compA/pathA' OR SCOPE='file://compB/pathB' but it doesn't. For simple queries, I can query compA and compB separately and then merge the results myself, but I'm hoping for a better way. Anybody here have some experience with this?

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• Databinding multiple tables linq query to gridview?

  - by Curtis White

  My question is how can I display a linq query in a gridview that has data from multiple tables AND allow the user to edit some of the fields or delete the data from a single table? I'd like to do this with either a linqdatasource or a linq query. I'm aware I can set the e.Result to the query on the selecting event. I've also been able to build a custom databound control for displaying the linq relations (parent.child). However, I'm not sure how I can make this work with delete? I'm thinking I may need to handle the delete event with custom code.

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• SQLite table query

  - by soclose

  Hi I query the table by using this function below public Cursor getTableInfo() throws SQLException { return db.query(TableName, null, null, null, null, null, null); } I got the error "View Root.handleMessage(Message)line:1704". I could insert the data but can't query the data. I called this function below Cursor c = db.getTableInfo(); int cRow = c.getCount(); if (cRow == 0) { Toast.makeText(NewContact.this, "No Record", Toast.LENGTH_LONG).show(); } Please help me.

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• Timestamp as int field, query performance

  - by Kirzilla

  Hello, I'm storing timestamp as int field. And on large table it takes too long to get rows inserted at date because I'm using mysql function FROM_UNIXTIME. SELECT * FROM table WHERE FROM_UNIXTIME(timestamp_field, '%Y-%m-%d') = '2010-04-04' Is there any ways to speed this query? Maybe I should use query for rows using timestamp_field >= x AND timestamp_field < y? Thank you I've just tried this query... SELECT * FROM table WHERE timestamp_field >= UNIX_TIMESTAMP('2010-04-14 00:00:00') AND timestamp_field <= UNIX_TIMESTAMP('2010-04-14 23:59:59') but there is no any performance bonuses. :(

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• Google Datastore low-level api query by key property

  - by Keyur

  I'm using the low-level google datastore api and I want to query by the key property and another property (let's call it category). I need to query based on a list of keys for which I'll use the IN operator. I know that the max. number of values you can provide for the IN clause is 30. I have 2 questions: Does the limit of 30 IN values apply to the key property as well? Do I need to create a composite index on {_key_ + category} or just on {category} for this query? Thanks, Keyur

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• Silverlight datagrid don't show any data with anonymous query RIA services

  - by user289082

  Hi all! I have an anonymous linq query that I bind to a datagrid, when I debug it brings alright the data but it doesn't show in the datagrid, I suspect that the request to RIA services isn't completed before I bound it to the datagrid. I could use the LoadOperation<() Completed event. But it only works with Defined Entities so how can I do that? For reference here is the last post: http://stackoverflow.com/questions/2403903/linq-query-null-reference-exception Here is the query: var bPermisos = from b in ruc.Permisos where b.IdUsuario == SelCu.Id select new { Id=b.Id, IdUsuario=b.IdUsuario, IdPerfil=b.IdPerfil, Estatus=b.Estatus, Perfil=b.Cat_Perfil.Nombre, Sis=b.Cat_Perfil.Cat_Sistema.Nombre }; I'm a totally newbie sorry if is a very simple question. Thanks!!

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• SQL Server 2008 - Search Query

  - by user208662

  Hello, I am not a SQL Expert. I’m trying to elegantly solve a query problem that others have had to have had. Surprisingly, Google is not returning anything that is helping. Basically, my application has a “search” box. This search field will allow a user to search for customers in the system. I have a table called “Customer” in my SQL Server 2008 database. This table is defined as follows: Customer UserName (nvarchar) FirstName (nvarchar) LastName (nvarchar) As you can imagine, my users will enter queries of varying cases and probably mis-spell the customer’s names regularly. How do I query my customer table and return the 25 results that are closest to their query? I have no idea how to do this ranking and consider the three fields listed in my table. Thank you!

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• Sql query: use where in or foreach?

  - by phenevo

  Hi, I'm using query, where the piece is: ...where code in ('va1','var2'...') I have about 50k of this codes. It was working when I has 30k codes, but know I get: The query processor ran out of internal resources and could not produce a query plan. This is a rare event and only expected for extremely complex queries or queries that reference a very large number of tables or partition I think that problem is related with IN... So now I'm planning use foreach(string code in codes) ...where code =code Is it good Idea ??

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