CREATE TABLE Syntax CREATE TABLE table_name ( column1 datatype [constraints], column2 datatype [constraints], … ); Explanation: table_name: Name of the […]
PostgreSQL CREATE TABLE Syntax and Examples Read More »
1. Syntax to Create a Database CREATE DATABASE database_name; What it does: This command creates a new database named database_name
How to Create a Database in PostgreSQL Read More »
Imagine This… You run a small snack shop. At the end of each day, you record which employee sold what
Pivot Tables: GROUP BY + aggregate functions Read More »
Imagine This You’re collecting a list of student grades, but some students haven’t submitted their homework yet. So their grade
Handling NULLs: IS NULL, COALESCE(), IFNULL() Read More »
Imagine This You’re running a lemonade stand. At the end of the day, you look at your sales and want
Case Statements: CASE WHEN … THEN … END Read More »
Imagine This You just finished sorting your toy collection — all your favorite cars in a line. Now, you want
Exporting query results to CSV Read More »
Imagine This You have a notebook filled with names, phone numbers, and salaries. That’s your CSV or Excel file —
Load CSV/Excel into SQL (LOAD DATA, COPY) Read More »
Import / Export in SQL – Data Transfer Explained What Is Import and Export? In SQL, Export means taking data
Import / Export in SQL – Data Transfer Explained Read More »
Syntax CREATE FUNCTION function_name (param1 DATATYPE, param2 DATATYPE, …) RETURNS return_datatype BEGIN — SQL logic here RETURN value; END; What
CREATE FUNCTION – User-Defined Functions in SQL Read More »
Syntax — Create a stored procedure CREATE PROCEDURE procedure_name() BEGIN — SQL statements here END; — Call the procedure CALL
CREATE PROCEDURE, CALL – Stored Logic in SQL Read More »