#sqltips kết quả tìm kiếm

The fix is simple but powerful 👇 ON c.code = e.code AND p.year = e.year Always join on all matching keys, not just one. Otherwise, your data lies to you — beautifully and silently. #SQLTips #DataEngineering #100DaysOfSQL

SQL Tip of the Day: Use INSTEAD OF DELETE for Soft Deletes Protect your data: CREATE TRIGGER trg_SoftDelete ON Users INSTEAD OF DELETE AS UPDATE Users SET is_deleted = 1 WHERE user_id IN (SELECT user_id FROM DELETED); No data loss, just a status change. #SQLTips…

SQL Tip of the Day: Use sp_depends to Check Object Dependencies Before changing tables or columns, run: EXEC sp_depends 'YourObjectName'; Catch downstream breakage before it happens! #SQLTips #DependencyCheck #SQLServer #LearnSQL

Step 2: Assign alternating positions Male → rn * 2 - 1 → odd positions (1, 3, 5 …) Female → rn * 2 → even positions (2, 4, 6 …) This ensures that when we sort by sort_order, rows alternate: Male → Female → Male → Female Step 3: Final output #SQLTips #DataAnalytics

SQL Date Math 101: Use DATE_ADD/DATEADD to dynamically filter sales, calculate the past, and more! 🔗scriptdatainsights.blogspot.com/2025/10/sql-da… 🔗youtube.com/shorts/mZfisV6… #SQLTips #DateFunctions #MySQL

SQL Tip of the Day: Use PERCENT_RANK() for Normalized Ranking Want a value between 0 and 1 to show rank? SELECT name, score, PERCENT_RANK() OVER (ORDER BY score DESC) AS pct_rank FROM ExamResults; Ideal for dashboards. #SQLTips #WindowFunctions #Ranking #LearnSQL

Use EXPLAIN before running complex queries — it helps you understand how the database executes them. Optimize before it slows down your app. #SQLTips #Database #3iLinkx

SQL Tip of the Day: Use BINARY_CHECKSUM for Row Hashing Detect changes without comparing each column: SELECT BINARY_CHECKSUM(*) FROM Employees; Good for delta loads or sync jobs. #SQLTips #ChangeDetection #DataSync #TSQL

SQL Tip of the Day: Use WITH ENCRYPTION to Hide Stored Procedure Logic Protect intellectual property in procedures/views: CREATE PROCEDURE dbo.SecretLogic WITH ENCRYPTION AS BEGIN -- Hidden logic END; Prevents viewing with sp_helptext. #SQLTips #Security…

SQL Tip of the Day: Use FORMATMESSAGE for Dynamic Error Text Build clear, reusable error messages: DECLARE @msg NVARCHAR(100); SET @msg = FORMATMESSAGE('User %s not found.', 'JohnDoe'); PRINT @msg; Better than string concatenation for debugging or logging. #SQLTips…

Use QUOTENAME() to Safely Escape Identifiers SELECT QUOTENAME('table name with space'); -- Returns: [table name with space] Avoids syntax errors with dynamic SQL. Use it in automation? #SQLTips #DynamicSQL #TSQL #LearnSQL

SQL Tip of The Day Use sp_MSforeachtable to Loop Through All Tables EXEC sp_MSforeachtable 'SELECT COUNT(*) FROM ?'; Undocumented, but handy! Used this one? #SQLTips #SQLServerHacks #DatabaseAdmin #LearnSQL

SQL Tip Of The Day Use OFFSET-FETCH for Paging APIs SELECT * FROM Products ORDER BY name OFFSET 20 ROWS FETCH NEXT 10 ROWS ONLY; Clean pagination in modern apps. Used this pattern before? #SQLTips #APIDesign #Pagination #LearnSQL

SQL Tip Of The Day Use REVERSE() to Flip Strings SELECT REVERSE('SQL'); -- Outputs LQS Niche, but fun and sometimes useful. Ever had to reverse strings? #SQLTips #StringFunctions #LearnSQL

🔍 Search anywhere in text 👇 SELECT * FROM Person.Person WHERE LastName LIKE '%son%'; ✅ Matches Johnson, Emerson, etc. Perfect for exploring messy or incomplete data. #SQLTips #DataCleaning

🔗 Step 2: Combine Conditions (AND / OR) Use AND when both conditions must be true. Use OR when either can be true. SELECT * FROM Sales.SalesPerson WHERE Bonus > 0 AND SalesYTD > 1000000; ✅ Salespeople with bonuses and ₦1M+ sales. #sqltips

Did you know? 🤔 Indexing JSON columns in PostgreSQL can drastically speed up queries if you're frequently searching within JSON data. This can save you time when working with database optimization. #SQLtips

🔄 Using Both Together You can combine WHERE + ORDER BY: SELECT * FROM Sales.CreditCard WHERE CardType = 'Vista' ORDER BY ExpMonth; 💡 You can filter alone ✅ 💡 Or sort alone ✅ 💡 But don’t sort before filtering ❌ (it’ll throw an error) #SQLTips

Slow queries? 🐢 Add the right indexes ⚡ 💡 Index only columns you search/filter. Too many = slower writes. Right balance = rocket-fast queries 🚀 #SQLTips #DatabasePerformance #GrowXen #BackendDev

🔥 SQL Command Types Explained (With Examples) SQL commands are divided into 5 Main Categories based on their functionality. A thread 🧵👇🏻 #SQL #LearnSQL #SQLTips #SQLTutorial #DatabaseManagement #SQLQueries #SQLDeveloper #SQLForBeginners

Want to know how to work with date and time functions in SQL? 1) Extract Year from Date Use the YEAR() function in SQL! This will return the year from each order date in your dataset. Simple and efficient! 🗓️ #SQLTips

Struggling with SQL errors? We've all been there!🥲 These common errors might be the reason. Learn how to spot and fix them ASAP for a smooth SQL journey #SQLError #DataAnalysis #SQLTips #TechStruggles #LearnAndGrow #Database #CodingChallenges #TDI #TdiCommunity

Use window functions like ROW_NUMBER() to efficiently rank or paginate results without subqueries. Boost your query performance and clarity! 🚀 #Database #SQLTips #DataEngineering #SQLQueries #BigData

SQL Tuesday 💡 Want honest data? Start with smart constraints. ✅ PRIMARY KEY ✅ UNIQUE ✅ CHECK (age > 0) Clean queries begin with clean tables. -- #Tuesday #DataFellows #SQLTips #DataIntegrity #Air #Nigeria

A lot of time, you don't want to interact with null values in databases when you are working as a data analyst. Let's discuss that in this thread. #DataCleaning #SQLTips #DataQuality #SQLFunctions #DataWrangling #DatabaseManagement #DataPreparation #DataAnalyst #DataAnalysis…

💻 Ready for a Friday SQL Hack tip before the weekend kicks in? 🥳 Use COALESCE to make sure NULL values don’t spoil your data vibe! 👇 Start your weekend right with data that looks this good. 🥂 Let’s make our data as flawless as our weekend plans. #SQLTips #Datafrik

Happy Friday, #DataFam🎉 Did you know subqueries can make your SQL queries more powerful? Here’s a quick hack to make your WHERE clause smarter. 👇 💬 Have you used subqueries in your queries before? Try it out and let us know your thoughts #FridayFun #SQLTips

SQL Cheetsheet .............. #SQLCheatsheet, #SQLTips, #SQLTutorial, #SQLDatabase, #SQLQuery, #SQLHelp, #SQLProgramming, #SQLBasics, #SQLTools, #SQLLearning

If I use mysql_escape_string() in Yii, will it finally pass the vibe check or will it just vibe on its own?" Source: devhubby.com/thread/how-to-… #YiiTips #SQLTips #PHPTips #SecureWebDev #yiiframework #yii

In SQLite, you can calculate how many days are left until a certain date like this example. julianday() converts a date to the number of days since year 0. Useful for date math in SQL. #SQLite #SQLTips #DateTime #DevTips

In most relational DBs, SQL doesn’t support setting variables. If you want to set a variable's value in just one place, a recent tip I learned from AI is using like this: #SQLTips #Database #AI #TechLearning"

1/1 🔍 Decoding SQL's Mystery: Embracing Three-Valued Logic and Null Values 🤔 Did you know? In SQL, when null marks absent data, it ushers in a unique three-valued logic. When null impacts logical expressions, truth blurs into the unknown. #SQLtips #viralpost #keySkillset

¿Tu LIKE en PostgreSQL ignora el índice? 😱 Spoiler: el problema no es LIKE, es el COLLATE. En es_ES.UTF-8, el orden no es byte a byte y PostgreSQL salta el índice. ✅ Usa text_pattern_ops 🧠 De 60ms a 0.15ms. 👉 hopla.tech/optimizacion-b… #PostgreSQL #SQLTips

¿Tu base de datos sufre con búsquedas tipo LIKE '%texto%' en PostgreSQL? 😓 Te explicamos cómo usar collation 'C', trigramas y GIN con gin_trgm_ops para acelerar consultas pesadas. 👉 hopla.tech/we-like-postgr… #PostgreSQL #SQLTips

Joins in SQL are like puzzle pieces 🧩: They help you combine tables and uncover deeper insights. Know when to use INNER, LEFT, and RIGHT joins! #SQLTips #DataAnalysis"

¿Alguna vez has sentido la frustración de unir textos en SQL y que simplemente no funcionen como esperabas? 🧐 Descubramos juntos cómo la función CONCAT puede ser tu salvavidas en el mundo de SQL. ¡Te sorprenderás con lo que puedes lograr! #SQLTips #DataScience…