sql

UNION / UNION ALL – Stacking Results in SQL (because sometimes, you need to combine two lists into one) Quick […]

Common Table Expressions (CTEs) – WITH Statements (because sometimes, SQL needs a short-term memory to make things cleaner) 🔧 Quick

🔁 Correlated Subqueries – Referring to the Outer Query (because sometimes SQL needs to peek outside while doing the inside

🔧 Quick Syntax SELECT DATE_FORMAT(date_column, ‘format_string’) FROM table_name; This tells SQL: “Take this date, and show it to me in

🔧 Quick Syntax SELECT DATEDIFF(date1, date2); This tells SQL: “Tell me how many days are between date1 and date2.” Note:

🔧 Quick Syntax SELECT CURDATE(); This tells SQL: “Just give me today’s date. No need for the time part.” It

🔧 Quick Syntax SELECT NOW(); This tells SQL: “Give me the exact date and time — right now, down to

🔧 Quick Syntax SELECT REPLACE(column_name, ‘what_to_replace’, ‘new_value’) FROM table_name; This tells SQL: “Go into this column and replace every match

🔧 Quick Syntax SELECT LENGTH(column_name) FROM table_name; This tells SQL: “Count how many characters (including spaces and symbols) are in

🔧 Quick Syntax SELECT TRIM(column_name) FROM table_name; This tells SQL: “Remove any extra spaces at the start or end of