SQL Commands:SQL Commands are instructions. It is used to communicate with the database. It is also used to perform specific tasks, functions, and queries of data. SQL can perform various tasks like creating a table. add data to tables, drop the table modify the table. set permission for users.Types of SQL Commands: There are five […]
You’ve heard of inner, left, right, and outer joins, but do you know about NATURAL JOINS?? USING clause, which allows you to shortcut your writing of joins by only requiring the joining columns to be typed out once and returns those columns only once when you SELECT * from all your joined tables Well, natural […]
𝙒𝙝𝙮 𝙘𝙖𝙡𝙘𝙪𝙡𝙖𝙩𝙚 𝙧𝙚𝙥𝙚𝙖𝙩 𝙘𝙪𝙨𝙩𝙤𝙢𝙚𝙧𝙨?1. Repeat Customers spend more on each purchase2. Repeat Customers are more likely to shop with you again and again3. Repeat Customers are our business promoters4. Businesses spend more on your key times like festive rush 𝙒𝙝𝙮 𝙣𝙚𝙬 𝙘𝙪𝙨𝙩𝙤𝙢𝙚𝙧𝙨 𝙖𝙧𝙚 𝙞𝙢𝙥𝙤𝙧𝙩𝙖𝙣𝙩?1. Customer Acquisition Cost (CAC) is an important metric. The lesser the […]
Pivoting your data from long format (where values repeat in the first column) to wide format (where values do NOT repeat in the first column) comes in handy when you need to turn unique values in a column into individual columns. You can certainly use the PIVOT function to do so, but not all warehouses […]
LAG function in sql is used when we have data based on time and we want to replace the current data from the previous month’s data. In Oracle, you could use the LAG function within a case statement like so: If the data looks like this: Code: The result would be: This solution will work as long as you […]
This article includes a comprehensive introduction with step-by-step definitions and code in data pipelines to introduce the basics of data engineering. Data pipelines are widely used in data science and machine learning and are essential in the process of machine learning to integrate data from multiple streams to gain business intelligence for competitive and profitable […]
Select Statement is used for selecting data from a database. Data Returned in this query is stored in a table. Select Syntax Here column1,column2,…… are the column names you want to select from the table. You can select all columns at once using * instead of column names one by one. Sample Database Below is […]
Database A database is an organized collection of structured information, or data, typically stored electronically in a computer system. A database is usually controlled by a database management system (DBMS). Together, the data and the DBMS, along with the applications that are associated with them, are referred to as a database system, often shortened to just […]
