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• what is the Difference between Session id and Session key ?

  - by Vishwanath dalvi

  If v consider this two in any web app.. Session id vs Session key.. wt is the exact difference between them ?

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• Linq to SQL: How to delete using only the primary key?

  - by Jeremy

  How do I delete a record using Linq to SQL using only the primary key, without having to retrieve the exsting record from the database?

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• How to encrypt a file using a Public Key in C#?

  - by Ismael

  I have a 2048 bits public key (asymmetric, RSA) of which I know the Modulus and Exponent and need to encrypt a string. Ideally, I want to encrypt a small string in c# and later on decrypt it with python.

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• In a star schema, are foreign key constraints between facts and dimensions neccessary?

  - by Garett

  I'm getting my first exposure to data warehousing, and I’m wondering is it necessary to have foreign key constraints between facts and dimensions. Are there any major downsides for not having them? I’m currently working with a relational star schema. In traditional applications I’m used to having them, but I started to wonder if they were needed in this case. I’m currently working in a SQL Server 2005 environment.

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• What are the reasons *not* to use a GUID for a primary key?

  - by Yarin

  Whenever I design a database I automatically start with an auto-generating GUID primary key for each of my tables (excepting look-up tables) I know I'll never lose sleep over duplicate keys, merging tables, etc. To me it just makes sense philosophically that any given record should be unique across all domains, and that that uniqueness should be represented in a consistent way from table to table. I realize it will never be the most performant option, but putting performance aside, I'd like to know if there are philosophical arguments against this practice?

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• How to use NSPredicate with Key-Paths (and ALL)?

  - by Konstantin

  Taking example from Apple docs using predicates with Key-Paths NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ANY employees.firstName like 'Matthew'"]; Now, assume the employees has a bool field "isGood". The question: how do I select just those entities, having ALL of employees isGood==TRUE? I tried but failed with following predicates: "!(ANY employees.isGood != TRUE)" "(ALL employees.isGood == TRUE)" // Would be perfect, but throws an exception..

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• Why does Sql 2008 suggest I have the Primary Key Column as an Included Column in an Index

  - by Raine

  Sql 2008 is telling me to include the Primary Key in an index in the Included Column field. I thought the PK was automagically returned with all indexes?

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• Switching OS, what will I need to copy over? (ssh key, etc)

  - by GoodGets

  I'd like to change the OS on my laptop. I currently use Windows 7, but would like to install Ubuntu, but I'm not sure exactly what I need on the new OS. I've deployed an app to Heroku, which required my ssh key, is that all I need to copy over? Or are there other files I need as well?

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• How to handle "null primary key encountered" exception in eclipselink?

  - by den-javamaniac

  Hi. I'm catching ... Null primary key encountered in unit of work clone ... exception in eclipselink(2.0.2 with 2.0 jpa) literally meaning that id in my entity is <=0 (for primitive types). Though debug here states that everything's fine and I have nothing to worry about. My AS is glassfish v3. Can any one point out what may cause such behavior?

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• Can you use a prepared statement in MySQL with "On Duplicate Key Update"?

  - by Jim H.

  I can't find any reference to using "ON DUPLICATE KEY UPDATE" with MySQL and PHP. Am I correct in thinking that this is not possible? -Jim

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• Can Maven Wagon plugin use a private key for scp?

  - by Ben Burleson

  Can Maven Wagon plugin be configured to use a private key for ssh/scp? Everything I've tried still leaves maven to ask me for a password when it gets to the point of scp-ing.

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• The explain tells that the query is awful (it doesn't use a single key) but I'm using LIMIT 1. Is th

  - by Ricardo

  The explain command with the query: explain SELECT * FROM leituras WHERE categorias_id=75 AND textos_id=190304 AND cookie='3f203349ce5ad3c67770ebc882927646' AND endereco_ip='127.0.0.1' LIMIT 1 The result: id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE leituras ALL (null) (null) (null) (null) 1022597 Using where Will it make any difference adding some keys on the table? Even that the query will always return only one row.

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• Using a '.' in your key name in MongoDB (PyMongo)

  - by user319723

  When I try saving a dict with a '.' in the key PyMongo throws an error (InvaildName) however I do see (on the Mongodb website) that keys can have '.''s in them. Why is it that pymongo won't let me save these docs? Is there an issue with them and Mongo? James

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• How can i check if key is pressed during click event with jquery?

  - by daniel smith

  Hi, I would like to catch a click event with jquery and be able to tell if a key was pressed at the same time so i can fork within the callback function based on the keypress. for example: $("button").click(function() { if([KEYPRESSED WHILE CLICKED]) { do something... } else { do something different... } }); Does anyone know if this is possible at all or how it can be done if it is possible?

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• Fluent Nhibernate napping to existing database with primary key in joining table of a many to many r

  - by Todd

  I have an existing database with a many to many relationship however the joining table has a primary key ID and 2 foreign keys to do the join. Is it possible to configure the mapping files to handle this? at the moment i am stuck. Thanks

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• JavaScript: capture key press without placing an input element on the page?

  - by powerboy

  How to capture key press, e.g., Ctrl+Z, without placing an input element on the page in JavaScript? Seems that in IE, keypress and keyup events can only be bound to input elements (input boxes, textareas, etc)

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• How to iterate over an dictionary without knowing the keys, while getting key and object?

  - by dontWatchMyProfile

  I have an NSDictionary and want to iterate over the objects. But at the same time, I need to know the key of the dictionary. I remember there was a special, fancy form of fast enumeration, but have forgotten the exact syntax. Anyone?

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• Faster way to find out the key for given value from Map?

  - by Charles

  I want to find out the key for given value from HashMap, currently I have to go through all keys and check its value in map, is there a faster way?

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• Is it correct to represent a foreign key on a conceptual data model?

  - by Zach

  Is it correct to represent a foreign key on a conceptual data model, or should I only introduce foreign keys when I am doing the relational model?

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• How can I use a Perl hash key that has a literal dot?

  - by imerez

  I have a hash in Perl which has been dumped into from some legacy code the name of the key has now changed from simply reqHdrs to reqHdrs.bla $rec->{reqHdrs.bla} My problem is now I cant seem to access this field from the hash any ideas? The following is my error Download Script Output: Bareword "reqHdrs" not allowed while "strict subs" in use

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• How can I check if a Resource Bundle contains a specific key in a JSF page.

  - by Silverfox

  I have a JSF page which has a bundle loaded. However I need to dynamiclly build a key to access the property. What I need to do is check that the property exists so I can decide whether to render the or not. I have tried checking if the value is empty but it always renders the output. Thanks

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• How to Auto-Increment Non-Primary Key? - SQL Server

  - by user311509

  CREATE TABLE SupplierQuote ( supplierQuoteID int identity (3504,2) CONSTRAINT supquoteid_pk PRIMARY KEY, PONumber int identity (9553,20) NOT NULL . . . CONSTRAINT ponumber_uq UNIQUE(PONumber) ); The above ddl produces an error: Msg 2744, Level 16, State 2, Line 1 Multiple identity columns specified for table 'SupplierQuote'. Only one identity column per table is allowed. How can i solve it? I want PONumber to be auto-incremented.

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• Why does SQL Server 2008 suggest I have the primary key column as an included column in an index

  - by Raine

  SQL Server 2008 is telling me to include the Primary Key in an index in the Included Column field. I thought the PK was automagically returned with all indexes?

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• How do you send a key command using an NSTimer to a hidden application?

  - by Magician Software

  I am trying to write an app for Toontown that will send the "end" key when the application is minimized or hidden. How do I do this. I cant figure it out Thanks

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• Can I set ignore_dup_key on for a primary key?

  - by Mr. Flibble

  I have a two-column primary key on a table. I have attempted to alter it to set the ignore_dup_key to on with this command: ALTER INDEX PK_mypk on MyTable SET (IGNORE_DUP_KEY = ON); But I get this error: Cannot use index option ignore_dup_key to alter index 'PK_mypk' as it enforces a primary or unique constraint. How else should I set IGNORE_DUP_KEY to on?

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