Hồi đại học, tôi tưởng mình thành thạo WHERE trong SQL... đến khi LIKE hỏi thăm thì quên cú pháp 😭 Tổng hợp lại để bạn không mắc lỗi:
- Toán tử so sánh: =, >, <...
- AND/OR/NOT kết hợp điều kiện
- BETWEEN (bao gồm cả hai giá trị)
- IN thay thế nhiều OR
- LIKE (% cho nhiều ký tự, _ cho một ký tự)
Kèm ví dụ minh họa rõ ràng từ truy vấn thực tế!
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https://dev.to/yuktisays/sql-where-clause-i-thought-i-knew-it-u
Writing SQL queries is easy — but understanding their execution order is what separates good analysts from great ones.
SQL doesn’t run top to bottom; it follows a logical order — FROM → JOIN → WHERE → GROUP BY → HAVING → SELECT → ORDER BY → LIMIT.
Master this flow to debug, optimize, and write smarter queries.
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SQL commands are the backbone of every data operation.
From defining tables with DDL to managing data with DML and controlling access with DCL — each command group serves a specific purpose.
Master these 5 types to handle databases with precision and confidence.
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SQL joins are the backbone of relational data analysis.
They help combine tables to extract meaningful insights — from inner joins that show matches to outer joins that reveal unmatched data.
Mastering joins turns raw data into relationships that tell real business stories.
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Mastering SQL Joins is essential for every data professional.
• Inner Join: Matching rows only
• Left/Right Inclusive: Keep all rows from one side
• Left/Right Exclusive: Keep non-matching rows
• Outer Inclusive: Combine all data
• Full Outer Exclusive: Return only non-matching rows
These joins turn raw tables into meaningful insights.
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Today's Poll 👇
Which SQL statement do you use to view sorted data by a particular column?
Today's Poll... 👇
What does NULL mean in SQL?
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Today's Poll.. 👇
Which SQL keyword is used to remove duplicate records?
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Today's Poll... 👇
What is COMMIT in a database?
#Database #SQL #ProgrammingTips #LearnSQL #TuxAcademy #TechTrivia
Today's Poll...
What is a DDL statement in SQL?
#SQL #Database #TechQuiz #LearnSQL #TuxAcademy #ProgrammingFacts #InterviewPrep #DataEngineering #MySQL
Today's Poll... 👇
What is a DML statement in SQL?
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Today's Poll 👇
What is the SQL statement to retrieve all the data from a table using SQL?
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Today’s Poll... 👇
What is SQL?
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Example SQL GROUP BY Command with MySQL.
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Watch our full video tutorial: SQL GROUP BY: Visual Guide & Examples 👇
https://go.watsontechworld.com/71-video-long-form-sql-group-by-visual-guide-and-examples
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Example SQL SELECT Commands with MySQL.
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Watch our full video tutorial on the SQL SELECT statement 👇
https://watsontechworld.com/video-sql-select-statement-tutorial-01
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Any developers in our network planning to attend PGConf.DE (Germany's 9th Annual #PostgreSQL Conference)? It's this week (May 08-09) in #Berlin. Coming up quick!
SQL JOINs Guide: A Comprehensive Guide to Combining Data in SQL
Master SQL JOINs with our comprehensive guide! Learn INNER, LEFT, RIGHT, FULL, and more. Practical examples & best practices included. SQL JOINs Guide #SQLJoins #LearnSQL #Database #SQLTutorial #DataAnalysis #Programming
https://tech-champion.com/database/sql-joins-guide-a-comprehensive-guide-to-combining-data-in-sql/
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🐘 Introducing: Prairie Postgres, a 501(c)(3) nonprofit organization chartered in Illinois, the Prairie State, serving the Midwestern United States!
We are devoted to training, professional development, and networking opportunities for technical practitioners and researchers.
For more information, check out our website: https://prairiepostgres.org
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SQL JOINs Guide: A Comprehensive Guide to Combining Data in SQL
Master SQL JOINs with our comprehensive guide! Learn INNER, LEFT, RIGHT, FULL, and more. Practical examples & best practices included. SQL JOINs Guide #SQLJoins #LearnSQL #Database #SQLTutorial #DataAnalysis #Programming
https://tech-champion.com/database/sql-joins-guide-a-comprehensive-guide-to-combining-data-in-sql/
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