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What is the X-REQUEST-ID http header?

...ogled a lot this subject, read various articles about this header, its use in Heroku, and projects based on Django. 4 Answe...
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Execute Insert command and return inserted Id in Sql

I am inserting some values into a SQL table using C# in MVC 4. Actually, I want to insert values and return the 'ID' of last inserted record. I use the following code. ...
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Rails: Using greater than/less than with a where statement

I'm trying to find all Users with an id greater than 200, but I'm having some trouble with the specific syntax. 9 Answers ...
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updating table rows in postgres using subquery

Using postgres 8.4, My goal is to update existing table: 6 Answers 6 ...
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MySQL: Quick breakdown of the types of joins [duplicate]

I would like a quick breakdown of the types of MySQL joins. I know of these, the rest I am not sure what they mean. 3 Answe...
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How to implement a many-to-many relationship in PostgreSQL?

...lieve the title is self-explanatory. How do you create the table structure in PostgreSQL to make a many-to-many relationship. ...
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Remove duplicate rows in MySQL

I have a table with the following fields: 25 Answers 25 ...
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Linq to Entities join vs groupjoin

I have web searched but I still cant find a simple answer. Can someone please explain (in simple English) what a GroupJoin is? How is it different from a regular inner Join ? Is it commonly used? Is it only for method syntax? What about query syntax? A c# code example would be nice. ...
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How to get multiple counts with one SQL query?

I am wondering how to write this query. 9 Answers 9 ...
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JavaScript loop through json array?

I am trying to loop through the following json array: 11 Answers 11 ...