php – Laravel Eloquent how to join on a query rather than a table?-ThrowExceptions

Exception or error: I want to achieve this in Laravel: SELECT * FROM products JOIN (SELECT product_id, MIN(price) AS lowest FROM prices GROUP BY product_id) AS q1 ON products.id = q1.product_id ORDER BY q1.lowest; I wrote this, but clearly there is something wrong: $products = new Product(); $products = $products->join( Price::whereNotNull(‘price’)->select(‘product_id’, DB::raw(‘min(price) as lowest’))->groupBy(‘product_id’), ‘products.id’, …

Join two arrays in Java?-ThrowExceptions

Exception or error: This question already has answers here: Closed 7 years ago. Possible Duplicate: How to concatenate two arrays in Java? I have two objects HealthMessage[] healthMessages1; HealthMessage[] healthMessages2; HealthMessage[] healthMessagesAll; healthMessages1 = x.getHealth( ); healthMessages2 = y.getHealth( ); How should I join the two objects, so I can return only one: return healthMessagesAll; …

Can Java 8 streams cause a O(1) memory reduction on unbounded data to become O(n) memory because of the underlying ForkJoin implementation-ThrowExceptions

Exception or error: I’ve written a streams implementation that performs four simple reductions (+ and <) on the lines of a file. At first I performed four streams, but I decided to write my own accumulator and combiner so that I could perform all four reductions in one stream. On small data sets (10,000,000 lines) …

php – mysql select/delete using join over four tables-ThrowExceptions

Exception or error: I have four tables (in [] are columns): users [id] products [id] productRatings [id,value,user,product] comments [id,product,user] I would like to select/and ultimately delete productRatings where there are no associated comment by the same user for that product. That is, if user has rated product but did not comment, that rating should be …

java – Hibernate HT_ Temporary Tables ON JOINED inheritance, Migration from Hibernate 3.4.0.GA To 5.1-ThrowExceptions

Exception or error: I’m trying to migrate an application from Hibernate 3.4.0.GA to Hibernate 5.1, and after complete the required changes on java code, when I deploy the application I’m watching how Hibernate is trying to create HT_ tables (global temporary), one for each @Inheritance annotated entity. Searching on Google I’ve found why the tables …

java – Is it bad practice to use default common fork/join pool with CompletableFuture for doing long blocking calls?-ThrowExceptions

Exception or error: Lets say I have a CompletableFuture which wraps a blocking call like querying a backend using JDBC. In this case, since I am not passing any executor service as a parameter to CompletableFuture.supplyAsync(), the actual blocking work of fetching the resources over backend should be done by a thread within the common …