Found a total of 10000 related content
Learn to master Query Scopes in Laravel
Article Introduction：When building a Laravel application, you may need to write queries with constraints that are used in multiple places throughout the application. Maybe you are building a multi-tenant application and you have to constantly add where constraints to the query to filter by user's team. Or maybe you are building a blog and you have to constantly add where constraints to the query to filter if the blog post has been published.
In Laravel, we can use query scopes to help us store these constraints neatly in one place and reuse them.
In this article, we will study the local query scope and the global query scope. We will learn the difference between the two and how to create your own query
2025-03-06
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706
Methods for selecting specific fields and conditions when exporting data by PHPMyAdmin
Article Introduction：In PHPMyAdmin, data for specific fields and conditions can be exported through SQL query function. First, go to PHPMyAdmin, select the database and table, click "Export" and select the "Custom" option. Enter a SQL statement in the "WHERE" condition box on the "DUMP" tab, such as "SELECTname,emailFROMusersWHEREage>30ANDcity='Beijing'" to filter and export specific fields that meet the conditions.
2025-05-19
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374
How to find keys with redis
Article Introduction：There are several ways to find keys in Redis: Use the SCAN command to iterate over all keys by pattern or condition. Use GUI tools such as Redis Explorer to visualize the database and filter keys by name or schema. Write external scripts to query keys using the Redis client library. Subscribe to keyspace notifications to receive alerts when key changes.
2025-04-10
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948
5 jQuery Touch Swipe Image Gallery Plugins
Article Introduction：Five super cool jQuery touch sliding picture library plug-ins are recommended to help you display your products or portfolios in a wonderful way! Users can swipe up and down, left and right to switch pictures, which is worth a try! Related articles:
30 Best Free Android Media Players
Add jQuery drag/touch support for iPad
Hammer.js touch carousel diagram
A JavaScript library for multi-touch gestures.
Source code demonstration 2. TouchSwipe
TouchSwipe is a jQuery plug-in that can be used with jQuery on touch devices such as iPad and iPhone.
Source code demonstration 3. TouchWipe
Allows you to use iPhone, iPad or i
2025-02-23
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1001
Filtering Array Elements with the Javascript Filter Method
Article Introduction：JavaScript's filter method is used to create a new array containing all elements tested by the callback function. 1. Basic usage: filter traverses each element of the array. If the callback returns true, the element will be retained, such as filtering numbers greater than 25; 2. Filtering object array: You can filter through object properties, such as selecting users with age greater than or equal to 18; 3. Multi-condition filtering: You can use logical operators to combine multiple conditions in the callback, such as meeting age greater than 20 and the name contains the letter "a"; 4. Dynamic filtering: Combining the input box to realize the real-time search function, dynamically update the filter results based on user input, ensuring that upper and lower case insensitive.
2025-07-08
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129
php regex negative lookahead example
Article Introduction：Negative first is used in PHP regulars to match positions that do not follow specific content. ^(?!.\.jpg$).*$/ can filter non-.jpg-end file names, such as photo.png?; ^(?!.error). $/m can exclude log lines containing "error"; combined use such as ^a(?!.*b).*$/ can match strings starting with a and not containing b; common misunderstandings include missing writes.*, missing anchor points, and wrong order of multi-condition overlay. Correct combination of anchor points and wildcard characters is the key.
2025-07-07
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323
Filtering aggregated results using the SQL HAVING clause.
Article Introduction：HAVING is a clause in SQL used to filter aggregate results. Unlike WHERE, it acts on the grouped data after GROUPBY. 1.HAVING appears after GROUPBY and is used to filter the results after aggregation, supporting aggregation functions such as AVG, COUNT, SUM, etc.; 2. Expressions or alias can be used (depending on the database support), but non-aggregation fields are not recommended; 3. Common scenarios include filtering a specific number of groups (such as customers with orders exceeding 10 orders), and cooperating with COUNT for record filtering (such as users who log in at least twice); 4. Supporting multi-condition combination filtering, for example, meeting the average salary is greater than 5,000 and the number of people exceeds 20; 5. The difference from WHERE is that WHERE
2025-07-10
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881
Detailed explanation of nested usage scenarios for CASE WHEN conditional judgment
Article Introduction：Nested CASEWHEN statements are used to handle complex SQL conditional branches. 1. It achieves multi-condition judgment through multi-layer nesting, similar to a tree-like structure, with the outer layer as a tree trunk and the inner layer as a tree branch. 2. In order to improve readability and maintainability, it is necessary to make good use of comments, standardize code formats, and consider using auxiliary tables or functions to simplify logic. 3. The key to avoiding traps is to avoid missing ELSE statements, carefully check the logic to avoid errors, and pay attention to optimizing performance to prevent excessive nesting from affecting query efficiency. Only by mastering these skills can you efficiently use nested CASEWHEN statements.
2025-04-08
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973
Creating clustered and non-clustered indexes in SQL.
Article Introduction：Clustered index determines the physical storage order of data, and each table can only have one; non-clustered indexes create independent structures, and there can be multiple ones. 1. Clustered indexes are suitable for columns with high uniqueness, frequent queries, and many range queries, such as primary keys or commonly used filtering condition fields, but will affect the insertion performance. 2. Non-clustered indexes are suitable for different query scenarios. Data rows are positioned through pointers and support multi-field composite indexes. The most commonly filtered fields should be placed in front of them, and overwrite indexes can be built to avoid back-to-table queries. 3. Creating indexes requires weighing read and write performance, avoiding excessive indexes that increase maintenance overhead and occupy additional space. The query mode should be analyzed in combination with the execution plan and designed reasonably to achieve the optimal effect.
2025-07-07
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235
How to use media queries for responsive design
Article Introduction：Media query is the basic tool for responsive website design, enabling multi-device compatibility by switching styles based on device characteristics (such as screen width). Its basic syntax is @media media type and (condition){CSS rules}, for example, using @mediascreenand(max-width:767px) to adjust the style of the small screen. It is recommended to adopt a mobile priority strategy, first define the mobile phone style and then gradually adapt to a larger screen. Pay attention to when using: ① Select a general breakpoint instead of a specific device size; ② Set the viewport meta tag to ensure that the mobile terminal takes effect; ③ Avoid relying solely on browser zoom tests; ④ Only modify the styles that need to be adjusted in media queries. Mastering media queries helps build a responsive layout with clear structure and easy to maintain.
2025-06-30
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492
Dave The Diver: How To Catch Spider Crabs
Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w
2025-01-10
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777
Prepare for Interview Like a Pro with Interview Questions CLI
Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI
What is the Interview Questions CLI?
The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview
2025-01-10
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1405
Soft Deletes in Databases: To Use or Not to Use?
Article Introduction：Soft Deletes: A Question of DesignThe topic of soft deletes, a mechanism that "flags" records as deleted instead of physically removing them, has...
2025-01-10
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