coalesce

Consider this silly domain: namespace TryHibernate.Example { public class Employee { public int Id { get; set; } public string Name { get; set; } } public class WorkItem { public int Id { get; set; } public string Description { get; set; } public DateTime StartDate { get; set; } public DateTime EndDate { get; set; } } public class Task { public int Id { get; set; } public Employee Assignee { get; set; } public WorkItem WorkItem { get; set; } public string Details { get; set; } public DateTime? StartDateOverride { get; set; } public DateTime? EndDateOverride { get; set; } } } The idea is that

I have 'N' threads to perform simultaneously on device which they need M*N float from the global memory. What is the correct way to access the global memory coalesced? In this matter, how the shared memory can help? Usually, a good coalesced access can be achieved when the neighbouring threads access neighbouring cells in memory. So, if tid holds the index of your thread, then accessing: arr[tid] --- gives perfect coalescence arr[tid+5] --- is almost perfect, probably misaligned arr[tid*4] --- is not that good anymore, because of the gaps arr[random(0..N)] --- horrible! I am talking from the

I have two fields that I'm comparing with MySQL's function COALESCE() . For example, COALESCE(Field1, Field2) . The problem is, Field1 is sometimes blank but not null; since it's not null COALESCE() selects Field1, even though its blank. In that case, I need it to select Field2. I know I can write a if-then-else (CASE) statement in the query to check for this, but is there a nice simple function like COALESCE() for blank-but-not-null fields? SELECT IFNULL(NULLIF(Field1,''),Field2) NULLIF returns a NULL if Field1 is blank, while IFNULL returns Field1 if it's not blank or NULL and Field2

I need to create a view from several tables. One of the columns in the view will have to be composed out of a number of rows from one of the table as a string with comma-separated values. Here is a simplified example of what I want to do. Customers: CustomerId int CustomerName VARCHAR(100) Orders: CustomerId int OrderName VARCHAR(100) There is a one-to-many relationship between Customer and Orders. So given this data Customers 1 'John' 2 'Marry' Orders 1 'New Hat' 1 'New Book' 1 'New Phone' I want a view to be like this: Name Orders 'John' New Hat, New Book, New Phone 'Marry' NULL So that

A little help here. I really don't understand how to use this coalesce in MySQL I have read all the pages in page 1 result of how to use coalsece in google result. I know its meaning that it returns the first non-null value it encounters and null otherwise. But it's still vague for me. How come I saw queries that returns multiple values? Isn't it only the first not null value that is returned? And how do it decide which column to base? coalesce(column1,column2) ? what if first column is null and other column is not null? Or if I'm wrong or my syntax is wrong, how do i properly write it? Can