List of lectures for the course SQL, 35 quest level on JavaRush

Intro to Arrays: What They Are and When to Use Them
SQL SELF
35 level,0 lecture
Find out what arrays are in PostgreSQL, how to create them, when to use them, and how they differ from other ways of storing data. Real-world examples and tips for using arrays in practical tasks.
Open
Working with Arrays in PostgreSQL
SQL SELF
35 level,1 lecture
Learn how to create, use, and aggregate arrays in PostgreSQL: from simple ARRAY[] examples to advanced scenarios with array_agg() and filtering. Real-life cases for storing tags, access rights, and user action history.
Open
Extracting Data from Arrays: unnest(), array_length(), array_position()
SQL SELF
35 level,2 lecture
Learn how to efficiently extract and analyze data from arrays in PostgreSQL using the unnest(), array_length(), and array_position() functions. Real-life examples, common mistakes, and tips for practical tasks.
Open
Changing Data in Arrays: array_append(), array_remove()
SQL SELF
35 level,3 lecture
Learn how to add and remove elements in PostgreSQL arrays using the array_append() and array_remove() functions. SQL query examples, common mistakes, and tips for working with arrays.
Open
Searching Data in Arrays: ANY, ALL, operators @> and <@
SQL SELF
35 level,4 lecture
Learn how to efficiently search for values in PostgreSQL arrays using the ANY, ALL operators and the array_contains() function. This article covers query examples, common mistakes, and practical tips for working with array data.
Open