Results for "ETL Support"
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Data Pipeline and ETL (Extract, Transform, Load) Process/Tool and ELT
The ETL (Extract, Transform, Load) process/tool to collect, clean, and store data in a structured format. Extract (निकालना): सबसे पहले, डेटा को विभिन्न स्र…
SQL Server me Default Constraint Maintenance System (Auto Fix + Logging + Rollback)
Introduction Agar tum SQL Server me kaam karte ho, to tumne ye problem zarur dekhi hogi: Different tables me different default values Constraint naming random…
JSON Data – Complete Conceptual Guide (SQL Server Perspective)
🔹 JSON kya hota hai? (Quick recap) JSON (JavaScript Object Notation) ek lightweight text format hota hai data exchange ke liye. Example: { "empId…
What difference between between MySQL and MSSQL
Feature MySQL MSSQL Ownership Oracle Corporation Microsoft Licensing Open-source (GPL) and commercial versions Commercial with free Express Edition Operati…
Data Warehouse and Data Mining Syllabus
Yeh Data Warehouse and Data Mining ka complete syllabus list format me diya hai, bina explanation ke — sirf topics list: PART 1: Data Warehouse Syllabus Li…
What are Data warehouse, Data Lake ,data mining and DataMart and MetaData
Why a Data Warehouse? (Data Warehouse ki zarurat kyu hoti hai?) Aaj ke time me companies ka data multiple sources me store hota hai, jaise: • SQL Server da…
Markdown Cheat Sheet
...ruber’s original design document. All Markdown applications support these elements. Element Markdown …
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…
Table Types Comparison: SQL Server vs PostgreSQL
Table Type SQL Server PostgreSQL Scope / Lifetime Usage Notes Permanent Table CREATE TABLE Employee (...) CREATE TABLE Employee (...) Permanent in DB until…
SQL Interview Q&A
Here are the questions along with their corresponding answers extracted from the provided context: What is SQL? SQL stands for Structured Query Language. I…
Making API Calls in Python
APIs (Application Programming Interfaces) are the bridges that allow different software systems to communicate with each other. pip install requests import…
Spark Transformations, Actions and Lazy Evaluation and DAG.
Apache Spark RDD supports two types of Operations: Transformations Actions A Transformation is a function that produces new RDD from the existing RDDs but …
PySpark Built-in Functions
These functions are commonly used with groupBy() , agg() , or select() to compute things like sum, average, max, min, count, etc. PySpark functions come fr…
What is the KDD (Knowledge Discovery in Databases)
In today's world, data is everywhere. Businesses, healthcare, banking, and even social media generate vast amounts of data every second. But raw data alone…
What is Data Ingestion and DataFrame API
Data ingestion : Data ingestion refers to the process of collecting, importing, and importing data from various sources into a system or storage environmen…
SQL SQL Server Agent: Automation Ka Powerhouse in SQL ServerServer Agent
Agar aap production environment me kaam kar rahe ho, to aapko pata hoga ki kuch tasks aise hote hain jo baar-baar karne padte hain — jaise daily backup len…
Understanding Data Types and Variables in MSSQL vs PostgreSQL
📊 Data Types Comparison Table 🚩 Category 🟦 MSSQL 🟨 PostgreSQL Integer Types INT , BIGINT , SMALLINT INTEGER , BIGINT , SMALLINT , SERIAL Decimal Types …
DAX (Data Analysis Expressions) Operators and Data Type in Power BI
Here's the list of DAX operators in a table format: Arithmetic Operators Operator Description Example + Addition = + - Subtraction = - * Multiplication = *…
Triggers in SQL server
A trigger in SQL is a special type of stored procedure that runs automatically when certain actions happen in a table or view . A trigger cannot be explici…
Slowly Changing Dimensions (SCD)
Data Warehouse me ek bahut important concept hota hai: 👉 Slowly Changing Dimensions (SCD) Jab hum dimensional modeling karte hain, hum assume karte hain k…
SQL Server Multi-Level Approval Workflow with Auto Skip Logic
In many enterprise applications like HRMS, Travel Requests, Expense Approval, Purchase Approval , we need a multi-level approval workflow . But real system…
SQL Server Agent Alerts, Operators, Database Mail & Job Activity Monitor
Production environment me sirf jobs schedule karna hi kaafi nahi hota. Hume monitoring aur notification system bhi chahiye hota hai taaki agar koi job fail…
Indexes in Data Warehouse
Database Me Data Kaise Store Hota Hai? Table ke rows disk par randomly store hote hain. Example: Row Customer_ID Sales 1 8 100 2 5 200 3 4 300 4 8 150 Agar…
Natural Key vs Surrogate Key in Data Warehouse
Dimensional Modeling me ek important topic hota hai: 👉 Natural Key 👉 Surrogate Key Dono primary key ke type hain, lekin inka purpose aur usage alag hota …
In-Memory Databases (Data Warehouse Context)
🔹 In-Memory Database kya hoti hai? In-memory database wo database hoti hai jisme: 👉 Data hard disk par store nahi hota 👉 Data directly RAM (memory) me s…
Azure Data Factory (ADF)
Azure Data Factory (ADF) Kya Hai? Soch le tu ek delivery company chalata hai – jaise Swiggy/Zomato. Restaurant se khana uthaya → pack kiya → raste me check…
Comparison of WHERE Clause Operators in MSSQL vs PostgreSQL
Here's a comparison of how operators in the WHERE clause are used in Microsoft SQL Server (MSSQL) vs PostgreSQL : Operator Purpose Used in MSSQL Used in Po…
File Handling(create, read, write, and delete files etc.)
File Handling in Python allows us to create, read, write, and delete files . It's an essential feature when working with data that needs to be stored perma…
Python String format()/f-string Method
Python में format() / f-string method का उपयोग Strings में वैल्यूज़ को dynamic तरीके से insert करने के लिए किया जाता है। यह एक बहुत ही powerful और readable…
concat() and concat_ws() in PySpark
In PySpark, both concat() and concat_ws() are used to combine multiple columns into a single string column. ✅ concat() – Combines columns without any delim…
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 …
Understanding Default Size of VARCHAR in SQL Server
Introduction When working with SQL Server, developers often use the VARCHAR data type to store variable-length character data. However, many overlook a cri…
What is the Replication in MS SQL server
Replication is a way to copy data from one database to another and keep them in sync. This is useful when you want the same data available in multiple plac…
Functions in MySQL
In MySQL, a Function is similar to a Stored Procedure but with some key differences. Functions are used to perform calculations or operations and return a …
Basic in NumPy
NumPy is a Python library. NumPy is used for working with arrays. NumPy is short for "Numerical Python". The array object in NumPy is called ndarray, it pr…
What is Data Lake
A data lake is a centralized repository that allows you to store all your structured and unstructured data at any scale. You can store your data as-is, wit…
Spark session vs Spark context
In Apache Spark, SparkSession and SparkContext are both essential components, but they serve different purposes and have different scopes. Here's a detaile…
What is Managed and External table in Spark
In Apache Spark, both Managed and External tables are used to store the data. However, there are significant differences in how Spark manages the data for …
Databricks, Apache Spark, Data Engineering and Science etc.
Azure Databricks is a platform on Microsoft Azure that helps with big data analysis and machine learning. It lets you work with large datasets easily and c…
Logical Query Processing Phases in SQL
SQL query processing consists of several logical phases, which describe the order in which SQL statements are evaluated. These phases help in understanding…
Window Aggregate Functions in SQL
What is window function: Imagine you have a dataset with many rows, and you want to perform some calculations on each row based on a group of rows related …