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  • Describe the `vertical-align` property and its typical use cases
    Describe the `vertical-align` property and its typical use cases
    Thevertical-alignpropertyinCSSalignsinlineortable-cellelementsvertically.1.Itadjustselementslikeimagesorforminputswithintextlinesusingvalueslikebaseline,middle,super,andsub.2.Intablecells,itcontrolscontentalignmentwithtop,middle,orbottomvalues,oftenu
    CSS Tutorial . Web Front-end 347 2025-07-26 07:35:30
  • Migrating Data to MySQL from Other Database Systems
    Migrating Data to MySQL from Other Database Systems
    When migrating data to MySQL, you need to pay attention to key links to avoid data loss or structural confusion. First, we sort out the source database structure and check the table structure, field type, index, primary key and character set compatibility, especially encoding problems such as the conversion from GBK to utf8mb4. Secondly, select the appropriate data export tool, such as pg_dump, expdp or ETL tool, pay attention to special character processing when exporting, use CSV intermediate format and ensure escape rules. Next, use LOADDATAINFILE or client tools to import data in batches, first create a target table structure, close indexes and foreign keys when the data is large to improve efficiency, and record logs to track problems. Finally, verify the consistency of the data, compare the number of records, and randomly check the data content
    Mysql Tutorial . Database 440 2025-07-26 07:29:31
  • HTML `command` Tag (Deprecated: Modern Alternatives)
    HTML `command` Tag (Deprecated: Modern Alternatives)
    HTML tags have been abandoned, and it is recommended to use or JavaScript to implement command buttons; 1. It was used to define clickable command buttons or menu items, but the HTML standard has been removed; 2. Modern alternatives include using tags with clear semantics and good compatibility; 3. Interaction can also be achieved through or with ARIA attributes and JavaScript; 4. Menu functions can be built with CSS and JavaScript, and ARIA roles are added to improve accessibility; 5. Deprecated tags should not be used, modern semantic tags, CSS styles and JavaScript logic should be used instead.
    HTML Tutorial . Web Front-end 530 2025-07-26 07:28:02
  • HTML `required` Attribute for Form Validation
    HTML `required` Attribute for Form Validation
    Use the required attribute of HTML to verify the required form. The basic usage is to add this attribute to the input, textarea or select element to ensure that the user can only allow submission after filling it out; 1. Support common input types such as text, email, password, number, date, textarea and select; 2. For radio buttons, you need to add required for radio to ensure that at least one is selected; 3. At least one must be selected after adding required for multiple selection boxes; 4. The default value of the select element cannot be an empty string, otherwise it will be considered unselected; mainstream browsers support required, but old versions may
    HTML Tutorial . Web Front-end 406 2025-07-26 07:27:31
  • How to write a basic HTML5 page template?
    How to write a basic HTML5 page template?
    Declare the document as HTML5 to avoid the browser from entering weird mode; 2. Define the root element and specify the language to improve accessibility and SEO; 3. It includes ensuring correct character encoding, implementing responsive design, and setting page title; 4. Place all visible content, optionally add CSS, favicon and JavaScript links; this template is complete and compatible with modern browsers, and is suitable for any new HTML file.
    HTML Tutorial . Web Front-end 1001 2025-07-26 07:23:51
  • HTML `style` Tag: Inline vs. Internal CSS
    HTML `style` Tag: Inline vs. Internal CSS
    The style placement method needs to be selected according to the scene. 1. Inline is suitable for temporary modification of single elements or dynamic JS control, such as the button color changes with operation; 2. Internal CSS is suitable for projects with few pages and simple structure, which is convenient for centralized management of styles, such as basic style settings of login pages; 3. Priority is given to reuse, maintenance and performance, and it is better to split external link CSS files for large projects.
    HTML Tutorial . Web Front-end 368 2025-07-26 07:23:11
  • MySQL Database Schema Design Best Practices for Scalability
    MySQL Database Schema Design Best Practices for Scalability
    Database design is crucial to system expansion, and a reasonable structure can reduce the cost of reconstruction. 1. Weigh standardization and anti-standardization. For core tables with high read and write ratios, moderately anti-standardization, such as order table redundant user_name, low-frequency update data can be fully standardized. 2. It is recommended to use self-increment integers for primary keys. The index follows the principle of leftmost prefix and analyzes the slow query log regularly. 3. Table structure reserves extensions, such as status fields, independent state tables, and JSON extended field tables. 4. Plan the shard key before dividing the library and table. Usually, select the user ID and generate the primary key in a unified manner to avoid cross-slicing transactions. Query aggregation is processed by the application layer.
    Mysql Tutorial . Database 730 2025-07-26 07:12:20
  • Implementing MySQL Database DR Drills
    Implementing MySQL Database DR Drills
    Disaster recovery drills need to clarify goals, prepare the environment, perform observations, analyze and optimize. 1. Clarify the verification targets such as main library downtime switching, data consistency, application connection, time-consuming, etc. and select failure scenarios. 2. In the off-peak preparation drill environment, ensure normal replication, consistent configuration, complete backups and formulate a rollback plan. 3. Observe master-slave delay, data consistency, switching time, log output, client behavior and tool logic during execution. 4. After the drill, the analysis results form report update monitoring, scripts, documents, contacts and other continuous optimization processes to improve reliability.
    Mysql Tutorial . Database 386 2025-07-26 07:09:51
  • HTML Error Handling Techniques
    HTML Error Handling Techniques
    To handle HTML errors, you need to start from four aspects: structural specification, resource loading, form verification and compatibility. 1. Use effective structure to ensure that the tag is closed and the semantics are correct, and avoid misalignment; 2. Add alt attribute to the image and set an error fallback scheme to monitor the failure of resource loading; 3. Use required and pattern attributes to perform form verification, and at the same time the backend is validated again, combining JS to improve the experience; 4. Use progressive enhancement strategies to provide fallback content, and test the performance of mainstream browsers. Use polyfill to be compatible with the old environment if necessary.
    HTML Tutorial . Web Front-end 855 2025-07-26 07:09:31
  • MySQL Database Cost Optimization Strategies
    MySQL Database Cost Optimization Strategies
    MySQL database cost optimization mainly revolves around resource utilization and performance efficiency. 1. Reasonably select cloud service packages, select appropriate configurations by monitoring load conditions, give priority to memory instances and use reserved instances to save costs; 2. Optimize query and index design, avoid SELECT*, reasonably use combined indexes, and regularly analyze slow query logs; 3. Implement data archiving and database sub-table strategies, move cold data to low-cost storage, and perform horizontal sub-tables to reduce single-node pressure if necessary; 4. Use cache to reduce database pressure, cache hotspot data through Redis, reduce the number of connections and requests, and improve system stability. Continuous observation and gradual adjustment are the key to achieving long-term cost control.
    Mysql Tutorial . Database 732 2025-07-26 07:07:31
  • Understanding MySQL temporary table usage and performance
    Understanding MySQL temporary table usage and performance
    A MySQL temporary table is a table that is only visible in the current session and automatically deleted after the session is over. It is suitable for storing intermediate results to optimize complex queries. It is similar to ordinary tables, but does not write to disk (unless the amount of data is large). Common scenarios include cached intermediate results, avoiding duplicate subqueries, and simplifying JOIN operations; its life cycle is limited to the current connection, and different connections do not affect each other even if the same name is the same; performance impact mainly includes the overhead of disk switching, frequent creation and deletion, and the lack of index reduction efficiency; it is recommended to control the data scale, add necessary indexes, and avoid repeated creation in loops; in terms of usage, temporary tables are suitable for large intermediate sets with multiple references, while subqueries are suitable for simple one-time operations, while CTE pays more attention to readability but may not be efficient.
    Mysql Tutorial . Database 422 2025-07-26 07:05:11
  • What are common CSS browser inconsistencies?
    What are common CSS browser inconsistencies?
    Different browsers have differences in CSS parsing, resulting in inconsistent display effects, mainly including the default style difference, box model calculation method, Flexbox and Grid layout support level, and inconsistent behavior of certain CSS attributes. 1. The default style processing is inconsistent. The solution is to use CSSReset or Normalize.css to unify the initial style; 2. The box model calculation method of the old version of IE is different. It is recommended to use box-sizing:border-box in a unified manner; 3. Flexbox and Grid perform differently in edge cases or in old versions. More tests and use Autoprefixer; 4. Some CSS attribute behaviors are inconsistent. CanIuse must be consulted and downgraded.
    CSS Tutorial . Web Front-end 559 2025-07-26 07:04:51
  • Understanding MySQL Binary Log Formats and Their Impact
    Understanding MySQL Binary Log Formats and Their Impact
    MySQL binary logs are available in three formats: STATEMENT, ROW and MIXED. 1. The STATEMENT format records the SQL statement itself, which is suitable for scenarios with simple logic and sensitive to disk space, but may cause master-slave inconsistency due to non-deterministic functions; 2. The ROW format records specific changes in each line to ensure data consistency, and is suitable for high-precision requirements scenarios, but the large log volume affects performance; 3. The MIXED format automatically switches the first two, and achieves a balance between log size and consistency, which is suitable for use in uncertain situations. Performance, consistency and log management costs should be weighed according to business needs when choosing.
    Mysql Tutorial . Database 938 2025-07-26 07:04:30
  • Understanding MySQL GTID Based Replication
    Understanding MySQL GTID Based Replication
    GTID is the global unique transaction identifier used for master-slave replication in MySQL, and the format is source_id:transaction_id, where source_id is the server UUID and transaction_id is the transaction number. To enable GTID replication, you need to set gtid_mode=ON and enforce_gtid_consistency, and use mysqldump with --set-gtid-purged=ON parameters to export data. When creating a copy user, specify MASTER_AUTO_POSITION=1. Frequently asked questions include inconsistent GTID sets caused by wrong transactions, replication delays, and GTID disconnections.
    Mysql Tutorial . Database 523 2025-07-26 07:02:40

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