How to check if Fortran array contains value?
ANY should actually be the right choice if ( ANY( lastNeighArray==”n” ) ) then there is also ALL if you wanted the whole array to contain that value.
where-clause
Can you use “where” to require an attribute in c#?
Nope, I’m afraid not. The only things you can do with constraints are: where T : class – T must be a reference type where T : struct – T must be a non-nullable value type where T : SomeClass – T must be SomeClass or derive from it where T : ISomeInterface – T … Read more
Eloquent where condition based on a “belongs to” relationship
You may try this (Check Querying Relations on Laravel website): $movies = Movie::whereHas(‘director’, function($q) { $q->where(‘name’, ‘great’); })->get(); Also if you reverse the query like: $directorsWithMovies = Director::with(‘movies’)->where(‘name’, ‘great’)->get(); // Access the movies collection $movies = $directorsWithMovies->movies; For this you need to declare a hasmany relationship in your Director model: public function movies() { return … Read more
How do I append a ‘where’ clause using VB.NET and LINQ?
I believe this is how you would do it in VB (I’m a C# developer): query = query.Where(Function(s) s = “ABC”) See LINQ – Sample Queries for some examples.
How can you turn an index array into a mask array in Numpy?
Here’s one way: In [1]: index_array = np.array([3, 4, 7, 9]) In [2]: n = 15 In [3]: mask_array = np.zeros(n, dtype=int) In [4]: mask_array[index_array] = 1 In [5]: mask_array Out[5]: array([0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0]) If the mask is always a range, you can … Read more
SQL Server : check if variable is Empty or NULL for WHERE clause
Just use If @searchType is null means ‘return the whole table’ then use WHERE p.[Type] = @SearchType OR @SearchType is NULL If @searchType is an empty string means ‘return the whole table’ then use WHERE p.[Type] = @SearchType OR @SearchType=”” If @searchType is null or an empty string means ‘return the whole table’ then use … Read more
Use a calculated column in a where clause
Using Derived Columns in a predicate You’ll need to wrap the inner query in a derived table or CTE in order to be able to use derived columns in the WHERE clause (Also, note SUM() is specified just once, using the results of the multiplication): SELECT x.Code, x.AccountNumber, x.Sales FROM ( SELECT p.Code, c.AccountNumber, SUM(p.UnitPrice … Read more
Swift “where” Array Extensions
extension Array { func filterWithId<T where T : Idable>(id : String) -> [T] { … } } defines a generic method filterWithId() where the generic placeholder T is restricted to be Idable. But that definition introduces a local placeholder T which is completely unrelated to the array element type T (and hides that in the … Read more
Which performs first WHERE clause or JOIN clause
The conceptual order of query processing is: 1. FROM 2. WHERE 3. GROUP BY 4. HAVING 5. SELECT 6. ORDER BY But this is just a conceptual order. In fact the engine may decide to rearrange clauses. Here is proof. Let’s make 2 tables with 1000000 rows each: CREATE TABLE test1 (id INT IDENTITY(1, 1), … Read more
C# FindAll VS Where Speed
The FindAll method of the List<T> class actually constructs a new list object, and adds results to it. The Where extension method for IEnumerable<T> will simply iterate over an existing list and yield an enumeration of the matching results without creating or adding anything (other than the enumerator itself.) Given a small set, the two … Read more