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Премиум
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    What is PostgreSQL All About?
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    Database Design
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    Creating Tables
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    Analyzing CREATE TABLE
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    Inserting Data Into a Table
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    Retrieving Data with Select
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    Calculated Columns
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    Calculating Phone Revenue
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    Exercise Solution
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    String Operators and Functions
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    Filtering Rows with "Where"
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    More on the "Where" Keyword
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    Compound "Where" Clauses
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    A "Where" Exercise Overview
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    A "Where" Solution
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    "Where" With Lists
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    A "Where" With Lists Solution
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    Calculations in "Where" Clauses
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    Solving Calculations
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    Updating Rows
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    Deleting Rows
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    A Solution for Updating Rows
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    Solution for Deleting Rows
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    The Plan Moving Forward
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    Approaching Database Design
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    One-to-Many and Many-to-One Relationships
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    One-to-One and Many-to-Many Relationships
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    Primary Keys and Foreign Keys
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    Understanding Foreign Keys
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    Auto-Generated ID's
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    Creating Foreign Key Columns
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    Running Queries on Associated Data
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    Exercise Overview
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    Foreign Key Creation Solution
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    Foreign Key Constraints Around Insertion
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    Constraints Around Deletion
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    Testing Deletion Constraints
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    Setting Foreign Keys to Null on Delete
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    Adding Some Complexity
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    Queries with Joins and Aggregations
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    Joining Data from Different Tables
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    Another Quick Join
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    Exercise Overview
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    A Joinful Solution
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    Alternate Forms of Syntax
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    Missing Data in Joins
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    Why Wasn't It Included
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    Four Kinds of Joins
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    Each Join in Practice
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    Does Order Matter?
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    Exercise Overview
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    Two Possible Solutions
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    Where with Join
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    Three Way Joins
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    A Bit of Practice
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    Exercise Solution
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    Aggregating and Grouping
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    Picturing Group By
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    Aggregate Functions
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    Combining Group By and Aggregates
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    A Gotcha with Count
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    Visualizing More Grouping
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    Exercise Overview
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    Grouping Solution
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    Adding a Layer of Difficulty
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    Solution
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    Filtering Groups with Having
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    Having In Action
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    More on Having!
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    A Having Exercise Overview
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    A Quick Solution
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    Investigating This Dataset
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    Some Group By Practice
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    Group By Review Solution
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    Remember Joins?
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    Of Course You Remember!
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    The Basics of Sorting
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    Two Variations on Sorting
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    Offset and Limit
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    Exercise Overview
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    Exercise Solution
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    Handling Sets with Union
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    A Few Notes on Union
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    Commonalities with Intersect
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    Removing Commonalities with Except
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    Union Exercise Overview
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    Exercise Solution
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    What's a Subquery?
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    Thinking About the Structure of Data
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    Subqueries in a Select
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    Exercise Overview
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    Select Solution
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    Subqueries in a From
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    From Subqueries that Return a Value
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    Example of a Subquery in a From
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    Exercise Overview
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    Exercise Solution
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    Subqueries in a Join Clause
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    More Useful - Subqueries with Where
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    Data Structure with Where Subqueries
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    Exercise Overview
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    Exercise Solution
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    The Not In Operator with a List
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    A New Where Operator
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    Finally Some!
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    Exercise Overview
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    A Quick Solution
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    Probably Too Much About Correlated Subqueries
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    More on Correlated Subqueries
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    A Select Without a From?
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    Exercise Overview
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    Exercise Solution
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    Selecting Distinct Values
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    Exercise Overview
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    A Distinct Solution
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    The Greatest Value in a List
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    And the Least Value in a List!
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    The Case Keyword
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    PostgreSQL Installation on macOS
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    PGAdmin Setup on macOS
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    Postgres installation on Windows
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    What'd We Just Do?
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    Data Types
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    Fast Rules on Numeric Data Types
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    More on Number Data Types
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    Reminder on Character Types
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    Boolean Data Types
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    Times, Dates, and Timestamps
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    Really Awesome Intervals
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    Thinking About Validation
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    Creating and Viewing Tables in PGAdmin
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    Applying a Null Constraint
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    Solving a Gotcha with Null Constraints
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    Default Column Values
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    Applying a Unique Constraint to One column
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    Multi-Column Uniqueness
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    Adding a Validation Check
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    Checks Over Multiple Columns
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    So Where Are We Applying Validation?
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    Approaching More Complicated Designs
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    Using a SQL Design Tool
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    A Config-based Schema Designer
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    Here's the Plan
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    Rebuilding Some Schema
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    Requirements of a Like System
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    How Not to Design a Like System
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    Designing a Like System
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    Making a Reaction System Instead
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    Polymorphic Associations
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    Polymorphic Association Alternative Implementation
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    The Simplest Alternative
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    So Which Approach?
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    Additional Features Around Posts
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    Adding Captions and Locations
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    Photo Mentions vs Caption Mentions
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    Considerations on Photo Tags vs Caption Tags
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    Update For Tags
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    Designing a Hashtag System
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    Tables for Hashtags
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    Including the Hashtag Table
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    A Few More User Columns
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    Why No Number of Followers or Posts?
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    Designing a Follower System
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    Back to Postgres
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    Creating Tables with Checks
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    Posts Creation
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    Comments Creation
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    Likes Creation
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    Photo Tags and Caption Tags
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    Creating Hashtags, Hashtag Posts, and Followers
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    Adding Some Data
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    Restoring from Scratch
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    Highest User ID's Exercise
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    Solution for User ID's
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    Posts by a Particular User
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    Solving for Posts by User
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    Likes Per User
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    Solution for Likes Per User
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    Thinking About Performance
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    Where Does Postgres Store Data?
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    Heaps, Blocks, and Tuples
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    Block Data Layout
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    Heap File Layout
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    Full Table Scans
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    What's an Index
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    How an Index Works
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    Creating an Index
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    Benchmarking Queries
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    Downsides of Indexes
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    Index Types
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    Automatically Generated Indexes
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    Behind the Scenes of Indexes
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    The Query Processing Pipeline
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    Explain and Explain Analyze
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    Solving an Explain Mystery
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    Developing an Intuitive Understanding of Cost
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    Calculating Cost by Hand
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    A Touch More on Costs
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    Startup vs Total Costs
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    Costs Flow Up
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    Use My Index!
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    Common Table Expressions
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    A Quick Solution
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    So What's a CTE?
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    Recursive CTE's
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    Recursive CTE's Step by Step
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    Why Use Recursive CTE's?
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    Writing the Query
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    Walking Through Recursion
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    Most Popular Users
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    A Possible Solution for Merging Tables
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    Creating a View
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    When to Use a View?
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    Deleting and Changing Views
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    Materialized Views
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    Grouping by Week
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    Reminder on Left Joins
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    Writing a Slow Query
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    Creating and Refreshing Materialized Views
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    What are Transactions Used For?
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    Some Sample Data
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    Opening and Closing Transactions
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    Transaction Cleanup on Crash
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    Closing Aborted Transactions
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    A Story on Migrations
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    Migration Files
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    Issues Solved by Migrations
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    A Few Notes on Migrations Libraries
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    Project Creation
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    Generating and Writing Migrations
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    Applying and Reverting Migrations
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    Generating and Applying a Second Migration
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    Schema vs Data Migrations
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    Dangers Around Data Migrations
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    Properly Running Data and Schema Migrations
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    Creating a Posts Table
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    A Small Web Server
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    Adding the Loc Column
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    Writing Values to Both Columns
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    Transaction Locks
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    Updating Values
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    Updating the App Server
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    Dropping the Last Columns
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    Section Goal
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    Initial Setup
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    One Fast Migration
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    Building the Users Router
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    Understanding Connection Pools
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    Validating Connection Credentials
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    Query and Close
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    The Repository Pattern
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    Creating a Repository
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    Accessing the API
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    Casing Issues
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    Fixing Casing
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    Finding Particular Users
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    SQL Injection Exploits
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    Handling SQL Injection with Prepared Statements
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    Preventing SQL Injection
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    Reminder on Post Requests
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    Inserting Users
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    Handling Updates
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    And, Finally, Delete
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    A Note on Testing
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    Assertions Around User Count
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    Connecting to a DB For Tests
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    Disconnecting After Tests
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    Multi-DB Setup
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    Assumptions Around Content
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    Issues with Parallel Tests
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    Isolation with Schemas
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    Creating and Accessing Schemas
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    Controlling Schema Access with Search Paths
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    Routing Schema Access
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    Strategy for Isolation
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    Programmatic Schema Creation
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    Escaping Identifiers
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    Test Helpers
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    Cleaning up Schemas and Roles
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    Finally... Parallel Tests! (Final Lecture)