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SQL join: selecting the last records in a one-to-many relationship
Suppose I have a table of customers and a table of purchases. Each purchase belongs to one customer. I want to get a list of all customers along with their last purchase in one SELECT statement. What is the best practice? Any advice on building indexes?
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How to create relationships in MySQL
...:
CREATE TABLE accounts(
account_id INT NOT NULL AUTO_INCREMENT,
customer_id INT( 4 ) NOT NULL ,
account_type ENUM( 'savings', 'credit' ) NOT NULL,
balance FLOAT( 9 ) NOT NULL,
PRIMARY KEY ( account_id ),
FOREIGN KEY (customer_id) REFERENCES customers(customer_id)
) ENGIN...
Are custom elements valid HTML5?
I've been unable to find a definitive answer to whether custom tags are valid in HTML5, like this:
12 Answers
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How to add custom method to Spring Data JPA
... all the crud and finder functionality working by default and if I want to customize a finder then that can be also done easily in the interface itself.
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What is “the inverse side of the association” in a bidirectional JPA OneToMany/ManyToOne association
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To understand this, you must take a step back. In OO, the customer owns the orders (orders are a list in the customer object). There can't be an order without a customer. So the customer seems to be the owner of the orders.
But in the SQL world, one item will actually contain a poi...
Best practice for partial updates in a RESTful service
I am writing a RESTful service for a customer management system and I am trying to find the best practice for updating records partially. For example, I want the caller to be able to read the full record with a GET request. But for updating it only certain operations on the record are allowed, like ...
Custom toast on Android: a simple example
I'm new to Android programming. What is a simple example showing a custom toast notification on Android?
17 Answers
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Searching if value exists in a list of objects using Linq
Say I have a class Customer which has a property FirstName . Then I have a List<Customer> .
9 Answers
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How to delete an object by id with entity framework
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In Entity Framework 6 the delete action is Remove. Here is an example
Customer customer = new Customer () { Id = id };
context.Customers.Attach(customer);
context.Customers.Remove(customer);
context.SaveChanges();
shar...
Change navbar color in Twitter Bootstrap
... color
#D5D5D5: active background
Default style
If you want to put some custom style, here's the CSS you need to change:
/* navbar */
.navbar-default {
background-color: #F8F8F8;
border-color: #E7E7E7;
}
/* Title */
.navbar-default .navbar-brand {
color: #777;
}
.navbar-default .navb...