Day 10 – PostgreSQL में DISTINCT, ALTER आ UPDATE Commands के Hands-on Practice

Описание: Resource Links - https://drive.google.com/drive/folder...

एह वीडियो में PostgreSQL में DISTINCT, ALTER आ UPDATE command के असली मतलब आ काम समझावल गइल बा। Example खातिर Movies आ Tourist नाम के Table बनाके duplicate हटावल गइल, column type बदले के process देखावल गइल, constraint handle कइल गइल, आ inconsistent data entries clean कइल गइल।

DISTINCT → duplicate हटाके सिर्फ unique value दिखावे (जइसे genre या gender).

ALTER TABLE → column type बदले (CHAR → VARCHAR) आ constraint manage करे.

UPDATE → inconsistent entries (जइसे Action, ACTION, action) के एक standard format में लावल.

Batch Execution → multiple SQL queries एक साथ run करे के तरीका (\i file.sql).

ई commands real-world data cleaning आ schema management में बहुत काम आवेला, खास करी के analytics आ reporting खातिर।

Day 10 – SQL in Action: DISTINCT, ALTER & UPDATE in PostgreSQL
In this session, we dive into three powerful SQL commands with real-world examples:

DISTINCT filters out duplicate values for cleaner results (e.g., unique genres).

ALTER TABLE modifies column structures and data types while managing constraints.

UPDATE standardizes inconsistent data entries across tables (case-insensitive corrections).

Plus, learn to batch multiple SQL statements using .sql files for efficient execution.

With practical examples on Movies and Tourist tables, this tutorial ensures you understand how to maintain data integrity, consistency, and analytics readiness in PostgreSQL.

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