Course Introduction：Common SQL statements include: 1. CREATETABLE creates tables, such as CREATETABLEemployees(idINTPRIMARYKEY, nameVARCHAR(100), salaryDECIMAL(10,2)); 2. CREATEINDEX creates indexes, such as CREATEINDEXidx_nameONemployees(name); 3. INSERTINTO inserts data, such as INSERTINTO employeees(id, name, salary)VALUES(1,'JohnDoe',75000.00); 4. SELECT check
2025-05-28 comment 0 865
Course Introduction：In MySQL, the methods of inserting data are divided into single insert and batch insert. 1. Single insertion is suitable for scenarios where immediate feedback and low data volume is required, and is implemented using the INSERTINTO statement. 2. Batch insertion is suitable for processing large amounts of data, including using INSERTINTO...VALUES statements and LOADDATA statements, the latter is more efficient. 3. Performance optimization suggestions include the use of transaction processing, management indexing and batch processing to improve the efficiency of batch insertion.
2025-05-22 comment 0 945
Course Introduction：The most common method to add new data to a database is to use the INSERTINTO statement. 1. The basic syntax is INSERTINTO table name (column 1, column 2, column 3) VALUES (value 1, value 2, value 3), the field order and value order must correspond; 2. Batch insertion can be performed, such as INSERTINTOusers(id, name, email)VALUES(1,'Alice','alice@example.com'),(2,'Bob','bob@example.com') to improve efficiency; 3. If the field is set to self-increment (such as AUTO_INCREMENT), the field can be omitted, and the database will automatically generate a unique ID.
2025-07-15 comment 0 128
Course Introduction：Efficient methods for batch inserting data in MySQL include: 1. Using INSERTINTO...VALUES syntax, 2. Using LOADDATAINFILE command, 3. Using transaction processing, 4. Adjust batch size, 5. Disable indexing, 6. Using INSERTIGNORE or INSERT...ONDUPLICATEKEYUPDATE, these methods can significantly improve database operation efficiency.
2025-04-29 comment 0 1140
Course Introduction：The methods of copying table structure and data in MySQL include: 1. Use CREATETABLE...LIKE to copy the table structure; 2. Use INSERTINTO...SELECT to copy the data. Through these steps, data backup and migration can be efficiently performed in different scenarios.
2025-04-29 comment 0 1050
Course Elementary 13768
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 82276
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 13141
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 24589
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 27445
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.
Duplicate entry '1' results in error code 1062: Conflict on primary key 'PRIMARY'
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How to use three tables to perform FULL OUTER JOIN operation in MySQL?
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The "where" statement in MySQL will interrupt the full connection
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How to prevent SQL injection in PHP?
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