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• How to make custom join query with Django ?

  - by xRobot

  I have these 2 models: genre = ( ('D', 'Dramatic'), ('T', 'Thriller'), ('L', 'Love'), ) class Book(models.Model): title = models.CharField(max_length=100) genre = models.CharField(max_length=1, choices=genre) class Author(models.Model): user = models.ForeignKey(User, unique=True) born = models.DateTimeField('born') book = models.ForeignKey(Book) I need to retrieve first_name and last_name of all authors of dramatic's books. How can I do this in django ?

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• Grails - Self Join

  - by WaZ

  Hi, When I write the following class, I get the following compilation error: could not resolve property How can I achive the following: class Employee{ String Name String Email Employee Manager static hasMany = [desginations:Designation] static constraints = { Name(unique:true) Email(unique:true) } Thanks, Much appreciated.

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• Join collection of objects into comma-separated string

  - by Helen Toomik

  In many places in our code we have collections of objects, from which we need to create a comma-separated list. The type of collection varies: it may be a DataTable from which we need a certain column, or a List<Customer>, etc. Now we loop through the collection and use string concatenation, for example: string text = ""; string separator = ""; foreach (DataRow row in table.Rows) { text += separator + row["title"]; separator = ", "; } Is there a better pattern for this? Ideally I would like an approach we could reuse by just sending in a function to get the right field/property/column from each object.

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• MongoDB-PHP: JOIN-like query

  - by mdm414

  Here are the objects: courses { "name" : "Biology", "_id" : ObjectId("4b0552b0f0da7d1eb6f126a1") } students { "name" : "Joe", "classes" : [ { "$ref" : "courses", "$id" : ObjectId("4b0552b0f0da7d1eb6f126a1") } ], "_id" : ObjectId("4b0552e4f0da7d1eb6f126a2") } Using the PHP Mongo Class, how do I get all the students that has a biology course? Thanks

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• Transitive SQL query on same table

  - by MiKu

  Hey. consider d following table and data... in_timestamp | out_timestamp | name | in_id | out_id | in_server | out_server | status timestamp1 | timestamp2 | data1 |id1 | id2 | others-server1 | my-server1 | success timestamp2 | timestamp3 | data1 | id2 | id3 | my-server1 | my-server2 | success timestamp3 | timestamp4 | data1 | id3 | id4 | my-server2 | my-server3 | success timestamp4 | timestamp5 | data1 | id4 | id5 | my-server3 | others-server2 | success the above data represent log of a execution flow of some data across servers. e.g. some data has flowed from some 'outside-server1' to bunch of 'my-servers' and finally to destined 'others-server2'. Question : 1) I need to give this log in representable form to client where he doesn't need to know anything about the bunch of 'my-servers'. All i am supposed to give is timestamp of the data entered my infrastructure and when it left; drilling down to following info. in_timestamp (of 'others_server1' to 'my-server1') out_timestamp (of 'my-server3' to 'others-server2') name status I want to write sql for the same! Can someone help? NOTE : there might not be 3 'my-servers' all the time. It differs from situation to situation. e.g. there might be 4 'my-server' involved for, say, data2! 2) Are there any other alternatives to SQL? I mean stored procs/etc? 3) Optimizations? (The records are huge in number! As of now, it is around 5 million a day. And we are supposed to show records that are upto a week old.) In advance, THANKS FOR THE HELP! :)

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• SQL Join Problem

  - by Harley

  Table one contains ID|Name 1 Mary 2 John Table two contains ID|Color 1 Red 1 Blue 2 Green 2 Blue 2 Black I want to end up with is ID|Name|Red|Blue|Green|Black 1 Mary    Y      Y 2 John            Y        Y       Y Thanks for and help.

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• Left Join 3 Tables and Show True or False on Empty Cells

  - by Jason Shultz

  Ok, this may be confusing so I hope I explain it correctly. I have 4 tables: business photos video category I want to display "featured" businesses on the home page (or elsewhere) and I want to show a Yes or No in the table row based upon whether or not there are photos or videos for that business. Example: Joes Crab Shack has no videos or photos but is featured. So, when his row is echoed out it will show the Business Name and Business Owner but there will be no data in the photo or video cells thus in the video and photos column it will say No. Otherwise, if the opposite was true, it would say Yes. Here's my pastebin

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• DB2 SQL count in join or where clause

  - by Pat

  This is probably an amateur question but I'm an amateur ! ;o) I have several tables: Account table, Officer table, Location table, Web table... The Officer table doesn't give me the number of officers per account. I need to retrieve only the accounts that have more than 20 officers. Should I use the COUNT ? If so, how ? Your help is greatly appreciated. Thanks. Pat

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• mysql prevent displaying a row ONE which has reference in another row TWO but no reference in row THREE

  - by Jayapal Chandran

  I have a table like the following id | name | pid 1 | sam | NULL 2 | sams ref | 1 3 | pam | NULL For the first time the first row gets inserted which will have pid as null I insert a row which is related to the first row and then i insert a row which is new and which may be referred by another row in future. now i want only the third row to be displayed and not the first and second row as the second row contains the reference of first row. so if any row has a reference to another row then both the rows should not be displayed. Only rows which is not having any reference should be displayed. BESIDES, IS IT A GOOD PRACTICE? PLEASE ADVICE ON THIS. Edited When i updated in server the query is always giving empty result. here is what i have and this one When pid is NULL then that row should appear but when another entry in the same table with pid as its parent id or any other rows id appears then both the rows should not appear. so if any pid has been referred then both the rows should not appear. here only one row will refer another row and not more than that. in my localhost i have mysql version 5.0.1 or something like that but when i installed xampp in another system it had 5.5 and in the live server it was 5.3 so in version around 5.0 the query is returning rows but in higher versions it is returning empty rows. so now i this case how to make a query?

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• What are appropriate ways to represent relationships between people in a database table?

  - by Emilio

  I've got a table of people - an ID primary key and a name. In my application, people can have 0 or more real-world relationships with other people, so Jack might "work for" Jane and Tom might "replace" Tony and Bob might "be an employee of" Rob and Bob might also "be married to" Mary. What's the best way to represent this in the database? A many to many intersect table? A series of self joins? A relationship table with one row per relationship pair and type, where I insert records for the relationship in both directions?

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• Many-to-Many Relationships in MySQL

  - by Kaji

  I've been reading up on foreign keys and joins recently, and have been pleasantly surprised that many of the basic concepts are things I'm already putting into practice. For example, with one project I'm currently working on, I'm organizing word lists, and have a table for the sets, like so: `words` Table `word_id` `headword` `category_id` `categories` Table `category_id` `category_name` Now, generally speaking this would be a one-to-many relationship, with several words being placed under a single category with the foreign key category_id. Let's assume for a moment, however, that a user chooses to add another category to a word, making it many-to-many—Is there a way to set up my words table to handle additional categories for words without creating extra columns like category_2, category_3, etc.?

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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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• HABTM and belongsTo at the same join, cakePhp

  - by Cynthia

  Hello everyone. I have a model Fix with a relationship HABTM Device model. Device model has a belongsTo to Device_type model, like this, for only getting the device type name: var $belongsTo = array('Device_type'=>array('fields'=>'name')); So, I need every Fix, its devices and its Device_types. When I make a Fix->find('all', array('recursive' => 2)) I expect to get every Device related to Fix (this works ok) and ALSO for every device, its Device_type.name (which is not working). This is what I get instead for every Device in the result (an empty array): ["Device_type"]=> array(0) { } Besides this, when I make this query for testing: Fix->Device->find('all'), it returns the current Device_type.names for every device related to fixes, which means models are related propertly. Any help? Thanks.

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• How to make an entity out of a join table without primary key

  - by tputkonen

  I'm trying to generate JPA entities out of an existing database having an "interesting" design. Database has a table called UserSet, which can have links to several other UserSets. There is a one to many relation between UserSets and LinkedUserSets. LinkedUserSets also has one to one relation to UserSets. I tried to generate a JPA Entity out of the database structure using Dali JPA Tools. The resulting entity Linkeduserset misses @Id or @EmbeddedId annotation and thus failes to compile. As the resulting entity contains only two @JoinColumns (which cannot be marked as @Id), I have not so far found a way around this issue. Database structure can not be modified in any way. Is there a way to overcome this somehow? Relevant pars of create table statements: CREATE TABLE `LinkedUserSets` ( `UsrSetID` INT(11) NOT NULL DEFAULT '0' , `ChildID` INT(11) NOT NULL DEFAULT '0' , CONSTRAINT `fk_LinkedUserSets_UserSet1` FOREIGN KEY (`UsrSetID` ) REFERENCES `UserSet` (`UsrSetID` )); CREATE TABLE `UserSet` ( `UsrSetID` INT(11) NOT NULL AUTO_INCREMENT , PRIMARY KEY (`UsrSetID`), CONSTRAINT `fk_UserSet_LinkedUserSets1` FOREIGN KEY (`UsrSetID` ) REFERENCES `LinkedUserSets` (`ChildID` )); Generated entities: @Entity @Table(name="linkedusersets") public class Linkeduserset { //bi-directional many-to-one association to Userset @ManyToOne @JoinColumn(name="UsrSetID") private Userset userset1; //bi-directional one-to-one association to Userset @OneToOne @JoinColumn(name="ChildID") private Userset userset2; } @Entity @Table(name="userset") public class Userset { private static final long serialVersionUID = 1L; @Id @Column(name="UsrSetID") private int jngSetID; //bi-directional many-to-one association to Linkeduserset @OneToMany(mappedBy="userset1") private Set<Linkeduserset> linkedusersets; //bi-directional one-to-one association to Linkeduserset @OneToOne(mappedBy="userset2") private Linkeduserset linkeduserset; } Error message: Entity "Linkeduserset" has no Id or EmbeddedId

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• Is there a LINQ equivalent of string.Join(string, string[])

  - by mdresser

  Is there any way to convert a collection of objects into a single new object using LINQ? I want to use this within another LINQ to SQL expression.

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• SQL Server Select Distinct

  - by homam

  I want to write a query like this: For a table that has these columns: ColA ColB ColC, ColD select first(ColA, ColB, ColC, ColD) distinct(ColB, ColC) from table order by ColD The query is supposed to order the table by ColD, then group the results by the combination of ColB and ColC (they may have different data types) and returns the first rows (with all the columns of the table) in the groups. How is it possible in MS SQL Server 2005?

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• Porting join from Oracle to Postgres

  - by Grasper

  INSERT INTO MISSION_OBJECTIVE( MSN_INT_ID, MO_INT_ID, MO_MSN_CLASS_NM, MO_MSN_CLASS_CD, MO_MSN_TYPE, MO_PRIORITY, MO_COMMENT, MO_START_DT, MO_END_DT, ASP_AIRSPACE_NM, MO_OBJ_LOCATION, MO_ALO_LEG_ID, MO_ALO_ARRIVE_LOC) SELECT '1025', '1', 'AIRDROP', 'ADP', 'LAPES', NULL, COALESCE( NULL, ' '), TO_TIMESTAMP( '1002260900', 'YYMMDDHH24MI'), TO_TIMESTAMP( '1002260915', 'YYMMDDHH24MI'), 'TRANSIT ALPHA', 'TRANSIT ALPHA', '1', 'TRANSIT ALPHA' FROM AIRSPACE ASP, apsmain .MISSION_CLASS MC WHERE ASP.ASP_AIRSPACE_NM(+)= 'TRANSIT ALPHA' AND MC.MCS_MISSION_CLASS_NAME= 'AIRDROP' AND 'TRANSIT ALPHA' IS NOT NULL Is that exactly the same as: INSERT INTO MISSION_OBJECTIVE( MSN_INT_ID, MO_INT_ID, MO_MSN_CLASS_NM, MO_MSN_CLASS_CD, MO_MSN_TYPE, MO_PRIORITY, MO_COMMENT, MO_START_DT, MO_END_DT, ASP_AIRSPACE_NM, MO_OBJ_LOCATION, MO_ALO_LEG_ID, MO_ALO_ARRIVE_LOC) SELECT '1025', '1', 'AIRDROP', 'ADP', 'LAPES', NULL, COALESCE( NULL, ' '), TO_TIMESTAMP( '1002260900', 'YYMMDDHH24MI'), TO_TIMESTAMP( '1002260915', 'YYMMDDHH24MI'), 'TRANSIT ALPHA', 'TRANSIT ALPHA', '1', 'TRANSIT ALPHA' FROM AIRSPACE ASP, apsmain .MISSION_CLASS MC WHERE ASP.ASP_AIRSPACE_NM = 'TRANSIT ALPHA' AND MC.MCS_MISSION_CLASS_NAME= 'AIRDROP' AND 'TRANSIT ALPHA' IS NOT NULL I just deleted the (+). The part that is confusing me is that ASP.ASP_AIRSPACE_NM is being right joined to a constant.

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• SQL to join to the best matching row

  - by williamjones

  I have a wiki system where there is a central table, Article, that has many Revisions in their own table. The Revisions each contain a created_at time and date column. I want to update the Articles to contain a denormalized field sort_name from the most recent Revision's name field. What SQL command can I issue to fill in each Article's sort_name field with its most recent Revision's name field? For what it's worth, I'm on PostgreSQL.

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• Nhibernate join on a table twice

  - by Zuber

  Consider the following Class structure... public class ListViewControl { public int SystemId {get; set;} public List<ControlAction> Actions {get; set;} public List<ControlAction> ListViewActions {get; set;} } public class ControlAction { public string blahBlah {get; set;} } I want to load class ListViewControl eagerly using NHibernate. The mapping using Fluent is as shown below public UIControlMap() { Id(x => x.SystemId); HasMany(x => x.Actions) .KeyColumn("ActionId") .Cascade.AllDeleteOrphan() .AsBag() .Cache.ReadWrite().IncludeAll(); HasMany(x => x.ListViewActions) .KeyColumn("ListViewActionId") .Cascade.AllDeleteOrphan() .AsBag() .Cache.ReadWrite().IncludeAll(); } This is how I am trying to load it eagerly var baseActions = DetachedCriteria.For<ListViewControl>() .CreateCriteria("Actions", JoinType.InnerJoin) .SetFetchMode("BlahBlah", FetchMode.Eager) .SetResultTransformer(new DistinctRootEntityResultTransformer()); var listViewActions = DetachedCriteria.For<ListViewControl>() .CreateCriteria("ListViewActions", JoinType.InnerJoin) .SetFetchMode("BlahBlah", FetchMode.Eager) .SetResultTransformer(new DistinctRootEntityResultTransformer()); var listViews = DetachedCriteria.For<ListViewControl>() .SetFetchMode("Actions", FetchMode.Eager) .SetFetchMode("ListViewActions",FetchMode.Eager) .SetResultTransformer(new DistinctRootEntityResultTransformer()); var result = _session.CreateMultiCriteria() .Add("listViewActions", listViewActions) .Add("baseActions", baseActions) .Add("listViews", listViews) .SetResultTransformer(new DistinctRootEntityResultTransformer()) .GetResult("listViews"); Now, my problem is that the class ListViewControl get the correct records in both Actions and ListViewActions, but there are multiple entries of the same record. The number of records is equal to the number of joins made to the ControlAction table, in this case two. How can I avoid this? If I remove the SetFetchMode from the listViews query, the actions are loaded lazily through a proxy which I don't want.

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• MySQL - optimising selection across two linked tables

  - by user293594

  I have two MySQL tables, states and trans: states (200,000 entries) looks like: id (INT) - also the primary key energy (DOUBLE) [other stuff] trans (14,000,000 entries) looks like: i (INT) - a foreign key referencing states.id j (INT) - a foreign key referencing states.id A (DOUBLE) I'd like to search for all entries in trans with trans.A 30. (say), and then return the energy entries from the (unique) states referenced by each matching entry. So I do it with two intermediate tables: CREATE TABLE ij SELECT i,j FROM trans WHERE A30.; CREATE TABLE temp SELECT DISTINCT i FROM ij UNION SELECT DISTINCT j FROM ij; SELECT energy from states,temp WHERE id=temp.i; This seems to work, but is there any way to do it without the intermediate tables? When I tried to create the temp table with a single command straight from trans: CREATE TABLE temp SELECT DISTINCT i FROM trans WHERE A30. UNION SELECT DISTINCT j FROM trans WHERE A30.; it took a longer (presumably because it had to search the large trans table twice. I'm new to MySQL and I can't seem to find an equivalent problem and answer out there on the interwebs. Many thanks, Christian

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• Merge two rows in SQL

  - by Jason

  Assuming I have a table containing the following information: FK | Field1 | Field2 ===================== 3 | ABC | *NULL* 3 | *NULL* | DEF is there a way I can perform a select on the table to get the following FK | Field1 | Field2 ===================== 3 | ABC | DEF Thanks Edit: Fix field2 name for clarity

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• SQL query through an intermediate table

  - by Bryan

  Given the following tables: Recipes | id | name | 1 | 'chocolate cream pie' | 2 | 'banana cream pie' | 3 | 'chocolate banana surprise' Ingredients | id | name | 1 | 'banana' | 2 | 'cream' | 3 | 'chocolate' RecipeIngredients | recipe_id | ingredient_id | 1 | 2 | 1 | 3 | 2 | 1 | 2 | 2 | 3 | 1 | 3 | 3 How do I construct a SQL query to find recipes where ingredients.name = 'chocolate' and ingredients.name = 'cream'?

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• limiting consecutive values of one column in a sql query.

  - by Brad Smith

  I have a table with the following structure: id -int(11) event_id -int(11) photo_id -int(11) created_at -datetime How do I write a query that will return the 100 most recent rows, but insuring that there are no more than 4 consecutive rows with the same value in photo_id

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• Freebase Query with "JOINS"

  - by codemonkey

  ... Yeah, yeah, I know traditional joins don't exist. I actually like the freebase query methodology in theory, just having a little trouble getting it to actually work for me : ) Anyone have a dumb-simple example of getting Freebase data via MQL that pulls from two different "tables"? In particular, I'm trying to get automotive data... so for example, pulling fields from both /automotive/model_year and /automotive/trim_year. I've read the documentation (for hours actually). There's a distinct possibility that I'm looking right at such an example somewhere and just not seeing it because my OLTP brain just doesn't comprehend what it's seeing. * Note * ... that the two "types" I'm working with above are siblings, not parent/child. Does freebase even allow joining data between sibling nodes... I see examples of queries pulling from parent/child, but not from siblings I don't think (or I've overlooked them).

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• MySQL Select statement Where table1.id != table2.id

  - by Michael

  I have a table of data which has posts, then I have a separate table of data which has deleted posts. What happens when a post is deleted is that it's ID get's added to the deleted table rather than removing the post entry. What is a clean efficient way of selecting all the posts from the posts table without selecting the ones that have their ID in the deleted table

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