Effectively, WHERE conditions and JOIN conditions for [INNER] JOIN are 100 % equivalent in PostgreSQL. (It’s good practice to use explicit JOIN conditions to make queries easier to read and maintain, though). The same is not true for a LEFT JOIN combined with a WHERE condition on a table to the right of the join. … Read more
You have configured the auth.php and used members table for authentication but there is no user_email field in the members table so, Laravel says SQLSTATE[42S22]: Column not found: 1054 Unknown column ‘user_email’ in ‘where clause’ (SQL: select * from members where user_email = ? limit 1) (Bindings: array ( 0 => ‘test@hotmail.com’, )) Because, it … Read more
Prior to MySQL 5.7 the default was to allow non FULL group by. Which means you can have a group by (that uses aggregate functions like sum and max and count and group_concat) with other non-aggregated columns (let’s call them NON AGGS) like your first 3 shown not all part of your group by clause. … 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
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
Because ClockListener is a nested class (lower), the enclosing instance (upper) can access the listener’s private fields. If you have a reference to an instance of ClockListener, ClockListener cl = new ClockListener(); you can use it to initialize your timer Timer t = new Timer(1000, cl); and you can use it in your test: if … 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
The ability to put superclass constraints on protocols declarations (that is, being able to define protocol P where Self : C where C is the type of a class) was a premature consequence of SE-0156, and the syntax should have been rejected in Swift 4.x until the feature was implemented. Attempting to use this feature … Read more