Скачать или смотреть ALTER, DROP & MODIFY SQL Constraints | Primary, Foreign, Unique & Check Hands‑On

In this video, you’ll learn how to alter, drop, or modify SQL constraints in RDBMS with hands‑on examples. These are essential operations when your data model evolves. Perfect for developers, DBAs, or students wanting clear mastery.

What you’ll learn:

What are constraints in SQL (PRIMARY KEY, FOREIGN KEY, UNIQUE, CHECK, etc.)

How to DROP existing constraints (PRIMARY KEY, FOREIGN KEY, UNIQUE)
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Baeldung on Kotlin
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How to ALTER / MODIFY constraints by dropping and re‑creating them (most SQL dialects require this)
Baeldung on Kotlin
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Using ALTER TABLE to add constraints, removing them, and applying new rules on existing tables
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Syntax differences in MySQL, PostgreSQL, SQL Server, Oracle etc.
Baeldung on Kotlin
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Real‑world demos: e.g. drop foreign key, change delete behavior (CASCADE, RESTRICT), add a new UNIQUE constraint, modify a CHECK constraint

By the end of this video, you'll know exactly how and when to use ALTER, DROP, or MODIFY constraint syntax, avoid common pitfalls, and manage evolving database schemas with confidence.

Hashtags:

#SQLConstraints #AlterTable #DropConstraint #ModifyConstraint #DatabaseDesign #SQLTutorial #LearnSQL #RDBMS #CheckConstraint #UniqueConstraint