List of lectures for the course SQL, 17 quest level on JavaRush

Table Creation Basics: CREATE TABLE
SQL SELF
17 level,0 lecture
On this page, you’ll learn how to create tables in PostgreSQL using the CREATE TABLE command, get familiar with the main data types, see some table creation examples, and check out common mistakes people make when designing tables.
Open
Adding Constraints When Creating Tables: NOT NULL, UNIQUE
SQL SELF
17 level,1 lecture
Learn how to use NOT NULL and UNIQUE constraints in PostgreSQL to protect your data from mistakes and duplicates. Examples, explanations, and tips for using them — everything you need to confidently start working with table constraints.
Open
Using DEFAULT for default values
SQL SELF
17 level,2 lecture
Learn how to use default values in PostgreSQL with the DEFAULT keyword. We'll look at examples of creating tables, inserting data, plus common mistakes and best practices for working with DEFAULT for different data types.
Open
Working with the CHECK constraint for data validation
SQL SELF
17 level,3 lecture
The CHECK constraint in databases is a built-in mechanism for automatically validating data when you add or update it. In this material, you'll learn how to use CHECK to protect your tables from logical errors, see syntax examples, and check out typical use cases.
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Changing Table Structure with ALTER TABLE
SQL SELF
17 level,4 lecture
Learn how to flexibly change the structure of existing tables in PostgreSQL using the ALTER TABLE command: add and remove columns, change data types, rename tables and columns, and manage constraints. Practical examples and tips to avoid common mistakes.
Open