sql-order-by

I can sort a list using Sort or OrderBy. Which one is faster? Are both working on same algorithm? List<Person> persons = new List<Person>(); persons.Add(new Person("P005", "Janson")); persons.Add(new Person("P002", "Aravind")); persons.Add(new Person("P007", "Kazhal")); 1. persons.Sort((p1,p2)=>string.Compare(p1.Name,p2.Name,true)); 2. var query = persons.OrderBy(n => n.Name, new NameComparer()); class NameComparer : IComparer<string> { public int Compare(string x,string y) { return string.Compare(x, y, true); } } Why not measure it: class Program { class NameComparer : IComparer<string> {

I want to use order by with union in mysql query. I am fetching different types of record based on different criteria from a table based on distance for a search on my site. The first select query returns data related to the exact place search . The 2nd select query returns data related to distance within 5 kms from the place searched. The 3rd select query returns data related to distance within 5-15 kms from the place searched. Then i m using union to merge all results and show on a page with paging. Under appropriate heading as 'Exact search results' , 'Results within 5 kms' etc Now i want

I have a generic List<MyClass> where MyClass has a property InvoiceNumber which contains values such as: 200906/1 200906/2 .. 200906/10 200906/11 200906/12 My list is bound to a BindingList<T> which supports sorting with linq: protected override void ApplySortCore( PropertyDescriptor property, ListSortDirection direction) { _sortProperty = property; _sortDirection = direction; var items = this.Items; switch (direction) { case ListSortDirection.Ascending: items = items.OrderByDescending(x => property.GetValue(x)).ToList(); break; case ListSortDirection.Descending: items = items

How can one programmatically sort a union query when pulling data from two tables? For example, SELECT table1.field1 FROM table1 ORDER BY table1.field1 UNION SELECT table2.field1 FROM table2 ORDER BY table2.field1 Throws an exception Note: this is being attempted on MS Access Jet database engine ajgreyling Sometimes you need to have the ORDER BY in each of the sections that need to be combined with UNION . In this case SELECT * FROM ( SELECT table1.field1 FROM table1 ORDER BY table1.field1 ) DUMMY_ALIAS1 UNION ALL SELECT * FROM ( SELECT table2.field1 FROM table2 ORDER BY table2.field1 ) DUMMY

I want to do this: var orderBy = "Nome, Cognome desc"; var timb = time.Timbratures.Include("Anagrafica_Dipendente") .Where(p => p.CodDipendente == 1); if(orderBy != "") timb = timb.OrderBy(orderBy); Is there an OrderBy overload available that accepts a string parameter? Absolutely. You can use the LINQ Dynamic Query Library, found on Scott Guthrie's blog . There's also an updated version available on CodePlex . It lets you create OrderBy clauses, Where clauses, and just about everything else by passing in string parameters. It works great for creating generic code for sorting/filtering grids,

I have a table with 3 columns: id | name | priority -------------------- 1 | core | 10 2 | core | 9 3 | other | 8 4 | board | 7 5 | board | 6 6 | core | 4 I want to order the result set using priority but first those rows that have name=core even if have lower priority. The result should look like this id | name | priority -------------------- 6 | core | 4 2 | core | 9 1 | core | 10 5 | board | 6 4 | board | 7 3 | other | 8 Nerdmaster There's also the MySQL FIELD function . If you want complete sorting for all possible values: SELECT id, name, priority FROM mytable ORDER BY FIELD(name, "core",