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• C++ variable alias - what's that exactly, and why is it better to turn if off?

  - by Poni

  I've read the essay Surviving the Release Version. Under the "Aliasing bugs" clause it says: You can get tighter code if you tell the compiler that it can assume no aliasing.... I've also read Aliasing (computing). What exactly is a variable alias? I understand it means using a pointer to a variable is an alias, but, how/why does it affect badly, or in other words - why telling the compiler that it can assume no aliasing would get me a "tighter code"

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• Rules regarding iPhone apps

  - by iphone newbie

  iphone dev has this rule for iphone developers Be certain that the items you offer for purchase do not contain, or relate to, pornography, hate speech, defamation, or gambling (simulated gambling is acceptable). But how come there are apps in the app store such as iBetMate, which, in fact, allows users to gamble? Is there a clause or something that I missed in Apple's rules?

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• UpdateLayout throwing an ambigious exception

  - by Ouais

  the stack trace displays my method's name then "external code" then app_unhandledexception method, I'm developing within VS2008 SP1 for silverlight on firefox and windows 7(if that makes a difference). the weird thing is, the updatelayout method is called elsewhere and it generates no exception there, that said, if I put the method within a try-catch clause, it doesn't catch the exception, so if anyone has an idea, I'd appreciate it.

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• SQL - Conditionally evaluate WHERE clauses

  - by Crimius

  I need to get a WHERE clause to only evaluate certain statements. something like: WHERE field_a = field_b AND (CASE WHEN <PARAM>type</PARAM> = 5 THEN {field_c = 1 OR field_c = 2} WHEN <PARAM>type</PARAM> = 6 THEN {field_c = 3 OR field_c = 4} ELSE field_c = <PARAM>type</PARAM> so that when the Param type = 5, it only checks if field_c = 1 or 2. Any thoughts?

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• Assign a list of integers to an @var

  - by justSteve

  I can: declare @idOrder int set @idOrder = 21319 I want: declare @idOrder int set @idOrder = (21319, 21320) for use in a series of statements where the 'WHERE' clause uses the IN operator delete Orders where idOrder in @idOrder instead of delete Orders where idOrder in (21319, 21320)

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• error with linq join

  - by Luca Romagnoli

  I have this linq query: var segreterie = from s in db.USR_Utenti join h in db.USR_Accounts on new {s.ID, settings.GruppoSegreteria} equals new {h.USR_UtentiReference,h.ID_Gruppo} select s; that has this problem: The type of one of the expressions in the join clause is incorrect. Type inference failed in the call to 'Join'. how can i do to solve it?

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• MySQL 5 left join unknown column

  - by NP

  I had the below query working in mysql 4.1, but does not in 5.0: SELECT * FROM email e, event_email ee LEFT JOIN member m on m.email=e.email WHERE ee.email_id = e.email_id The error: 1054 (Unknown column 'e.email' in 'on clause')

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• Doctrine: how to create a query using "LIKE REPLACE" ?

  - by user248959

  Hi, this SQL clause is working OK: SELECT * FROM `sf_guard_user` WHERE nombre_apellidos LIKE REPLACE('Mar Sanz',' ','%') Now I'm trying to write this query for Doctrine. I have tried this: $query->andWhere(sprintf('%s.%s LIKE REPLACE (?," ","%")', $query->getRootAlias(), $fieldName), 'Mar Sanz')); but I get this error: Warning: sprintf() [function.sprintf]: Too few arguments Any idea? Regards Javi

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• In mysql or postgres, is there a limit to the size of an IN (1,2,n) statement?

  - by Kyle

  I've got quite a few SQL statements like such: SELECT foo FROM things WHERE user_id IN (1,2,3..n) Is there a known limit to the number of elements that will safely fit in an IN clause like that?

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• Modifying MySQL Where Statement Based on Array

  - by Ryan

  Using an array like this: $data = array ( 'host' => 1, 'country' => 'fr', ) I would like to create a MySQL query that uses the values of the array to form its WHERE clause like: SELECT * FROM table WHERE host = 1 and country = 'fr' How can I generate this query string to use with MySQL?

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• SQLite user_version() expression

  - by ralf.w.

  how can I get user_version into an expression (for SELECT or WHERE) ? I would also appreciate any clue to how to save ANY global variable in SQLite. Does anyone know of such an extension (dll) ? BTW: I know that PRAGMA user_version; gives me the right answer, but I cannot use that inside a WHERE-clause !

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• Running query from scratch with something like exec function?

  - by Steel Plume

  Hi, is it possible to make something similar to the following with Postgresql without using a function? pseudo sql code: select * from sometable where somecol = somevalue AND someothercol IN exec( 'select something from exclusionlist' ) My primary intention is to build up a table with predefined queries to call inside a where clause pseudo sql code: select * from sometable where somecol = somevalue AND someothercol IN exec( select query from predefinedqueries where id=someid )

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• Nhibernate inserting with values on a bag

  - by Phil Whittaker

  I am using a where clause on a bag to filter a bag. Is there any way to make nhibernate insert these filter values into the database?

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• Stored Procedure in postgresql, multiple queries w/ agreggates.

  - by fenix

  I'm trying to write a store procedure that can take some input parameters (obviously), run multiple queries against those, taking the output from those and doing calculations, and from those calculations and the original queries, outputting a formatted text string like: Number of Rows for max(Z) matching condition x and y of total rows matching x (x&y/x*100). To explain the max(Z) bit, this will be the username field, it won't matter which actual entry is picked, because the where clause will filter the results by user id, is there a saner way to do this?

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• include link list depending on category

  - by user117701

  I want to display the linklist widget only on a certain category. The current way the sidebar is fetched is: if (!function_exists('dynamic_sidebar') || !dynamic_sidebar(1)) Which doesnt give me a say in the calling of the links widget. If i put an if clause there, then the rest of the widgets dont get loaded. So i either need to customize the links widget it self or find a way to call the links widget directly? And how do i check which category i'm on?

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• Understanding PHP's way of reading if statements

  - by Masi

  How does PHP read if statements? I have the following if statements in this order if ( $number_of_figures_in_email < 6) { -- cut: gives false } if($number_of_emails > 0) { -- cut: gives false } if ( $number_of_emails == 0) { -- cut: gives true } The code behaves randomly. It sometimes goes to the third if clause and gives me a success, while sometimes to the one of the first two if clauses when the input variables are constant. This suggests me that I cannot code only with if statements.

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• "Ambiguous column name" error on one particular server

  - by jazbit

  This simple query throws the "Ambiguous column name TaskID" error on one db-server only. This is ridiculous. We tested this with the same database structure on different servers and different versions of ms sql (2005/2008), and it's only THIS particular client's server that throws the error. I'm actually frustrated. SELECT Tasks.TaskID FROM Tasks INNER JOIN TaskHelpers ON TaskHelpers.TaskID = Tasks.TaskID order by TaskID Yes, I know I can put "Tasks.TaskID" into the order by clause, but for some reasons I can't.

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• SQL - Add up all row-values of one column in a singletable

  - by ThE_-_BliZZarD

  Hello Everybody, I've got a question regarding a SQL-select-query: The table contains several columns, one of which is an Integer-column called "size" - the task I'm trying to perform is query the table for the sum of all rows (their values), or to be more exact get a artifical column in my ResultSet called "overallSize" which contains the sum of all "size"-values in the table. Preferable it would be possible to use a WHERE-clause to add only certain values ("WHERE bla = 5" or something similar). The DB-engine is HSQLDB (HyperSQL), which is compliant to SQL2008. Thank you in advance :)

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• Forcing the use of an index can improve performance?

  - by aF.

  Imagine that we have a query like this: select a.col1, b.col2 from t1 a inner join t2 b on a.col1 = b.col2 where a.col1 = 'abc' Both col1 and col2 don't have any index. If I add another restriction on the where clause, one that is always correct but with a column with an index: select a.col1, b.col2 from t1 a inner join t2 b on a.col1 = b.col2 where a.col1 = 'abc' and a.id >= 0 -- column always true and with index May the query perform faster since it may use the index on id column?

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• MongoDB using NOT and AND together

  - by Stankalank

  I'm trying to negate an $and clause with MongoDB and I'm getting a MongoError: invalid operator: $and message back. Basically what I want to achieve is the following: query = { $not: { $and: [{institution_type:'A'}, {type:'C'}] } } Is this possible to express in a mongo query? Here is a sample collection: { "institution_type" : "A", "type" : "C" } { "institution_type" : "A", "type" : "D" } { "institution_type" : "B", "type" : "C" } { "institution_type" : "B", "type" : "D" } What I want to get back is the following: { "institution_type" : "A", "type" : "D" } { "institution_type" : "B", "type" : "C" } { "institution_type" : "B", "type" : "D" }

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• implict type cast in generic method

  - by bitbonk

  why do I get a compiler error in the following code stating: Cannot implicty convert type SpecialNode to T even though T must derive from NodeBase as I defined in the where clause and even though SpecialNode actually derived from NodeBase? public static T GetNode<T>() where T : NodeBase { if (typeof(T) == typeof(SpecialNode)) { return ThisStaticClass.MySpecialNode; // <-- compiler error } if (typeof(T) == typeof(OtherSpecialNode)) { return ThisStaticClass.MyOtherSpecialNode; // <-- compiler error } ... return default(T); }

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• How to append an integer to a const char value in iphone?

  - by Warrior

  I have sql query statement which used to display the contents in the table.The sql statement consist of a where clause which is to be appended with numeric value as 1 ,2 3 etc depends upon the previously selected content.I am having the numeric value as int and i want it to append to sql statement which is const char.how can i append both the values.Please help me out. My query is == select * from Book where id=1; i have the id value is integer Thanks.

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• insert contacts into database but does not want to duplicate already existing contact.

  - by Frank Nwoko

  I am trying to insert contacts into database but does not want to duplicate already existing contact. Not sure INSERT has WHERE CLAUSE. Any ideas? //Insert INTO contact database $user_id = userid; $sql_insert = "INSERT into `jt_members_external_contacts` (`j_user_id`,`contact_email`,`firstname` ) VALUES ('$user_id','$email','$name') WHERE j_user_id !=$user_id AND contact_email != $email;";

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• Check value existance while performing a UPDATE query

  - by nimo

  Hi, I need to perform a simple update query where the update should only be done, if there is no value with updating value (item_name). For example, DB table [item_types] item_id(PK) | item_name Assuming there exist item_id with 6, My attempt is UPDATE item_types as k SET k.item_name = 'item_1' WHERE NOT EXISTS (SELECT * FROM item_types as a WHERE a.item_name = 'item_1') AND k.item_id = '6' But this gives me error "You can't specify target table 'k' for update in FROM clause" Could you please explain the error here and how can I achieve this ? Thank you

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• How do i check if something exist without using count(*) ... limit 1

  - by acidzombie24

  My code is SELECT COUNT(*) FROM name_list WHERE [name]='a' LIMIT 1 It appears there is no limit clause in SQL Server. So how do i say tell me if 'a' exist in name_list.name?

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