Sorry, I wasn’t sure which SQL platform you’re talking about: In MySQL: $query = (“SELECT * FROM $db WHERE conditions AND LENGTH(col_name) = 3”); in MSSQL $query = (“SELECT * FROM $db WHERE conditions AND LEN(col_name) = 3”); The LENGTH() (MySQL) or LEN() (MSSQL) function will return the length of a string in a column … Read more
For Laravel 5.6+ users, you can just do $posts = Post::whereDate(‘created_at’, Carbon::today())->get();
The aliases you give are for the output of the query – they are not available within the query itself. You can either repeat the expression: SELECT neededfield, CONCAT(firstname, ‘ ‘, lastname) as firstlast FROM users WHERE CONCAT(firstname, ‘ ‘, lastname) = “Bob Michael Jones” or wrap the query SELECT * FROM ( SELECT neededfield, … Read more
There are typically 2 ways to achieve this. Option1: Add another parameter to IGarrage representing the T which should be passed into the IGenericCar<T> constraint: interface IGarrage<TCar,TOther> where TCar : IGenericCar<TOther> { … } Option2: Define a base interface for IGenericCar<T> which is not generic and constrain against that interface interface IGenericCar { … } … Read more
1: The problem in the example f :: State s a f = State $ \x -> y where y = … x … is the parameter x. Things in the where clause can refer only to the parameters of the function f (there are none) and things in outer scopes. 2: To use a … Read more
They are identical: BETWEEN is a shorthand for the longer syntax in the question that includes both values (EventDate >= ’10/15/2009′ and EventDate <= ’10/19/2009′). Use an alternative longer syntax where BETWEEN doesn’t work because one or both of the values should not be included e.g. Select EventId,EventName from EventMaster where EventDate >= ’10/15/2009′ and … Read more
Where finds items that match and only returns those that do (filtering). -> IEnumerable<A> in, IEnumerable<A> out Select returns something for all items in the source (projection / transformation). That something might be the items themselves, but are more usually a projection of some sort. -> IEnumerable<A> in, IEnumerable<B> out
Select * From Table Where (col is null or col=””) Or Select * From Table Where IsNull(col, ”) = ”
Judging by the documentation for date/time functions, you should be able to do something like: SELECT * FROM FOO WHERE MY_DATE_FIELD >= NOW() – INTERVAL 1 DAY