Tutorial
Hands-on walkthroughs for SQL, Python, Excel and visualisation tools — every example is runnable, not a screenshot.
121 articles in Tutorial · Page 4 of 14
UNION vs UNION ALL in SQL: Key Differences
Learn the difference between UNION and UNION ALL in SQL, why UNION ALL is faster, when deduplication matters, and how to avoid costly sorting overhead.
Basic Excel Formulas: The Top 10 Formulas Every Analyst Needs to Know
Learn essential basic excel formulas: master SUM, AVERAGE, COUNT, IF, VLOOKUP, and conditional functions with syntax, examples, and practical fixes.
CAGR Formula in Excel: Growth Rate with RRI and Power Method
CAGR formula Excel guide: compute annualised growth with =(End/Start)^(1/n)-1 and =RRI(). Investor examples, negative bases, and CAGR vs XIRR explained.
How to Compare Two Columns in Excel: 5 Methods (with Formulas)
How to compare two columns in Excel: equality checks, IF flags, COUNTIF matching, conditional formatting highlights, and VLOOKUP reconciliation steps.
Compound Interest Formula in Excel: FV, Growth, and SIP Examples
Compound interest formula Excel guide: grow savings faster with =FV(rate, nper, pmt), the power-operator method, SIP math, and yearly compounding examples.
CREATE TABLE in MySQL: Syntax, Data Types & Constraints Guide
Master CREATE TABLE in MySQL with syntax examples, primary keys, foreign keys, AUTO_INCREMENT, constraints, and InnoDB engine best practices.
DDL SQL Commands: Complete Guide to Data Definition Language
Master DDL SQL commands: CREATE, ALTER, DROP, TRUNCATE, and RENAME with practical syntax, schema constraints, and DDL vs DML comparisons.
How to Delete Blank Rows in Excel: 4 Safe Methods (with Checks)
How to delete blank rows in Excel safely: Go To Special Blanks, AutoFilter blanks, helper COUNTBLANK flags, and backup checks every analyst must run first.
Delete Duplicate Records in SQL: 3 Proven Methods with Examples
Learn how to delete duplicate records in SQL using ROW_NUMBER() CTEs, self-joins with MIN/MAX IDs, and safe transaction workflows across dialects.