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Course Introduction：Using MySQL's HAVING Clause to Filter Grouped ResultsThe query you're trying to execute in MySQL aims to filter rows based on a specific condition...

2024-11-07 comment 0  405

Course Introduction：In SQL, the WHERE clause is used to filter query results. 1. It filters data that meets specific conditions through conditional expressions, and the condition must return a Boolean value. 2. Supported operators include comparison characters such as >,

2025-07-25 comment 0  223

Course Introduction：In Python, if-else can be used in conjunction with list comprehensions, but the syntax order is different from the usual ones. 1. When you need to return different values according to the condition, the structure is [expression_if_trueif conditionelseexpression_if_falseforiteminiterable], such as [xifx%2==0else0forxinnumbers]; 2. If you only need to filter elements, the structure is [expressionforiteminiterableifcondition], such as [xforxinnumsifx>0]; 3. For multi-condition cases, you can

2025-07-16 comment 0  966

Course Introduction：In Java 8, using the filter() method of StreamAPI combined with Lambda expressions can efficiently filter Lists. 1. Basic filtering: If you keep integers greater than 10, you need to use filter(n->n>10); 2. The filtering object list can be judged by object properties, such as filter(p->p.getAge()>30); 3. Multi-condition filtering can be implemented using logical operations combinations or chain calls; 4. The results can be further processed in combination with map() or limit(), such as extracting attributes or limiting the number.

2025-07-23 comment 0  807

Course Introduction：Use the filter() method to easily filter elements in Java collections. The specific steps are as follows: 1. Call the .stream() method of the collection to create a stream; 2. Use .filter() to pass in the Predicate condition to retain matching elements; 3. Collect the results into a new collection through .collect(). In the example, filtering names with string lengths greater than 4 or Person objects with age greater than 18 can all be implemented through chain calls, and the original set is not modified. The final output is a new list that meets the conditions. The entire process supports the combination of multi-condition combinations and other stream operations. The code is simple and powerful.

2025-08-03 comment 0  231

Course Elementary  13821

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82357

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13175

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24625

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27484

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.