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PySpark

Joins in PySpark

They allow us to combine two or more DataFrames based on a common column, enabling efficient data processing and analysis. 1. PySpark Join Types Below are …

cross join inner join Joins
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Mar 19, 2026 3 min read
SQL

Use of Apply(Cross and Outer) operator in SQL server

APPLY operator joins two table expressions. Also, I'll show how it differs from regular JOINs. Operator: CROSS APPLY Similar: INNER JOIN When to Use: Use a C...

comma saparate database excel
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Mar 19, 2026 3 min read
SQL

SQL Server Deadlock & Performance Monitoring Made Easy

Introduction In SQL Server, performance issues are very common. Sometimes queries run slow, sometimes users get stuck, and sometimes the system becomes unres...

SQLServer DBA PerformanceTuning
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Mar 19, 2026 52 min read
SQL

SQL Server User-Defined Functions (UDF)

SQL Server ke saare User-Defined Functions — Scalar, Inline TVF, MSTVF — ko ek jagah samjho. Real examples, performance tips, aur interview questions ke saath.

SQL Server UDF User Defined Function SQL Scalar Function SQL Server
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Apr 29, 2026 18 min read
SQL

Statistics in SQL Server

Statistics SQL Server ke “mind” jaise hote hain. Ye SQL Server ko batate hain ki table me data kis tarah se distribute hai — jaise kitne values unique hain…

CREATE STATISTICS Statistics UPDATE STATISTICS
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Mar 19, 2026 11 min read
Pandas

Pandas Data Manipulation: The Complete Guide (Part 2 — Indexing, GroupBy, Merge & Reshape)

Master Pandas data manipulation — loc/iloc, boolean filtering, GroupBy, merge/join, pivot tables, melt, string ops, and apply functions with real examples.

pandas groupby pandas merge pandas pivot table
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Apr 15, 2026 24 min read