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  • mysql - join tables by unique field

    - by Qiao
    I have two tables with the same structure: id name 1 Merry 2 Mike and id name 1 Mike 2 Alis I need to join second table to first with keeping unique names, so that result is: id name 1 Merry 2 Mike 3 Alis Is it possible to do this with MySQL query, without using php script?

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  • mysql composite unique on FK's

    - by m2o
    I want to implement the following constraints in mysql: create table TypeMapping( ... constraint unique(server_id,type_id), constraint foreign key(server_id) references Server(id), constraint foreign key(type_id) references Type(id) ); This throws a 'ERROR 1062 (23000): Duplicate entry '3-4' for key 'server_id'' when I issue an insert/update that would break the constraint. Is this type of constraint even possible? If so how? Thank you.

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  • Div Unique CSS Style Links

    - by Tom
    Hi, I want to create unique styles for my links in a single particular div (So for example I want all links bold and red in the main body, but in the sidebardiv I want them blue and italic) How do I go about it? I have: a:link{ color:#666666; } a:visited{ color:#003300; } a:hover{ color:#006600; } a:active{ color:#006600; } however if I put that in the sidebar div section it messes up my }'s

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  • Prolog: Error Handling and Find Unique

    - by anotherstat
    Given: fruitid('Apple', 'Granny Smith', 1). fruitid('Apple', 'Cox', 2). fruitid('Pear', 'Bartlett', 3). How would I go about finding only unique items for instance: is_unique(FruitName):- In the example clauses the answer would be Pear. I'm also trying to add error handling to my code, so in this instance if an input is: is_unique(pineapple) How could I catch this and output an error message? Thanks, AS

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  • Best practices for handling unique constraint violation

    - by umesh awasthi
    Hi All, While working in my application i came across a situation in which there are likely chances to Unque Constraints Violation.I have following options Catch the exception and throw it back to UI At UI check for the exception and show approrpriate Error Message This is something different idea is to Check in advance about the existance of the given Unique value before starting the whole operation. My Question is what might be the best practice to handle such situation.Currently we are using combo of Struts2+Spring 3.x+Hibernate 3.x Thanks in advance

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  • R: Select subset of dataframe by non-unique ids

    - by amarillion
    Suppose I have a dataframe like this one: df <- data.frame (id = c("a", "b", "a", "c", "e", "d", "e"), n=1:7) and a vector with ids like this one: v <- c("a", "b") How can I select the rows of the dataframe that match the ids in v? I can't use the id column for rownames because they are not unique.

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  • 2 fields unique

    - by xRobot
    I have this model: class blog(models.Model): user = models.ForeignKey(User) mail = models.EmailField(max_length=60, null=False, blank=False) name = models.CharField(max_length=60, blank=True, null=True) I want that (user,email) are unique togheter. For example: This is allowed: 1, [email protected], myblog 2, [email protected], secondblog This is NOT allowed: 1, [email protected], myblog 1, [email protected], secondblog Is this possible in Django ?

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  • How to get unique values when using a UNION mysql query

    - by Roland
    I have 2 sql queries that return results, both contain a contract number, now I want to get the unique values of contract numbers HEre's the query (SELECT contractno, dsignoff FROM campaigns WHERE clientid = 20010490 AND contractno != '' GROUP BY contractno,dsignoff) UNION (SELECT id AS contractno,signoffdate AS dsignoff FROM contract_details WHERE clientid = 20010490) So for example, if the first query before the union returns two results with contract no 10, and the sql query after the union also returns 10, then we have 3 rows in total, however because contractno of all three rows is 10, I need to have only one row returned, Is this possible?

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  • simple proof that GUID is not unique

    - by Kai
    I'd like to prove that a GUID is not unique in a simple test program. I expected this to run for hours but it's not working. How can I make it work? BigInteger begin = new BigInteger((long)0); BigInteger end = new BigInteger("340282366920938463463374607431768211456",10); //2^128 for(begin; begin<end; begin++) Console.WriteLine(System.Guid.NewGuid().ToString()); I'm using C#

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  • unique hash of string

    - by Aly
    Hi, I want to create a unique hash (16 chars long) of an arbitrary length String. Is there a good library that implements MD5 or SHA-1 for C++ with which I can achieve this? (and possibly an example of how to use it)

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  • Problems with unique links in database: www.doamin/ or domain/

    - by Thomas
    In my website everybody can send some links to other nice websites. All links in my database must by unique, but some links are with 'www.' prefix, and some without. Some ends for '/', some not. For example: |http://www.domain.com |http://domain.com |http://domain.com |http://domain.com/ and other problems can be with https or http. I know that I should change address before saving to database, but what standard I should use?

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  • ASP.NET : Tracking Unique page visits/views

    - by Shyju
    I have an ASP.NET application where View.aspx page will display the details of each products in a shopping cart.The page displays dynamic data(Ex: For each product id,the content will be different).Now i want to track the unique page views of each product.What are the best solutions to approach this problem ? I am already using google analytics.But i wanna custom solution for my web ap,so that i can know how many hits came for each product

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  • asp.net submit form to new window, retrieve unique id

    - by Joo Park
    On Page1.aspx...I have the following ...more hiddenFields Page2.aspx would be displayed in a new window and I need to grab the hiddenField values on this page. I can now get it to open in a new window and get those form values. The problem is lnkBtn is repeated in a listview and each link has a different value or id associated with the link. How do I pass in the unique id to Page2.aspx and grab the hiddenField?

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  • sql generate unique table/view name

    - by Claudiu
    I want to create some mad robust code. I want to take a query as a string, create a temporary view / table to store the results, use it, then drop the table. I want to use a name that is guaranteed to not already exist in the database. Is there an SQL command to generate a unique table name? I'm using postgresql if this is implementation-specific.

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