84 items
Join and Filter Customer Orders
Code QuizSELECT with WHERE Filter
QuizFix the JOIN Condition
Code QuizSelecting and Ordering Query Results
QuizClause Order in a Grouped Join Query
Code QuizFiltering Rows with WHERE
QuizFiltering Rows With NULL Values
Code QuizSQL Clause Execution Order
QuizFilter Aggregates with HAVING
Code QuizFiltering and Sorting Results
QuizCore SQL Querying Essentials
Slides / VideoFiltering Aggregated Results
QuizSQL Query Building Blocks
FlashcardSelecting All Columns With The Wildcard
Slides / VideoRemoving Duplicates With DISTINCT
QuizComparison Operators
QuizColumn Aliases With AS
QuizFiltering NULL Values
QuizSorting With ORDER BY
QuizNegating With NOT
QuizSet Membership With IN
QuizFiltering With WHERE
QuizLogical Order Of Clauses
QuizCombining With AND / OR
QuizSorting By Multiple Columns
QuizLimiting Result Rows
QuizPattern Matching With LIKE
QuizSelecting All Columns
QuizAscending vs Descending Sort
QuizString Literals And Quoting
QuizRange Filtering With BETWEEN
QuizSelecting Specific Columns
QuizSQL Syntax Basics
Slides / VideoLimiting Rows With LIMIT and TOP
Slides / VideoRemoving Duplicates With DISTINCT
Slides / VideoSorting by Multiple Columns
Slides / VideoAscending and Descending Order
Slides / VideoSorting Results With ORDER BY
Slides / VideoHandling NULLs With IS NULL
Slides / VideoSet Membership Filtering With IN
Slides / VideoRange Filtering With BETWEEN
Slides / VideoPattern Matching With LIKE
Slides / VideoCombining Conditions With AND, OR, NOT
Slides / VideoSQL Comparison Operators in WHERE
Slides / VideoFiltering Rows With WHERE
Slides / VideoRenaming Columns With AS Aliases
Slides / VideoSpecifying Tables With FROM
Slides / VideoPattern Matching With LIKE
Code QuizLimiting Returned Rows
Code QuizFiltering With IN
Code QuizFiltering Ranges With BETWEEN
Code QuizClause Order In A Query
Code QuizSorting Descending
Code QuizSelecting Specific Columns
Code QuizWHERE Comparison Operator
Code QuizCombining Conditions
Code QuizRemoving Duplicates With DISTINCT
Code QuizSelecting All Columns
Code QuizSorting By Multiple Columns
Code QuizSorting With ORDER BY
Code QuizHandling NULL Values
Code QuizColumn Aliases With AS
Code QuizSelecting Specific Columns by Name
Slides / VideoThe SELECT Statement's Purpose
Slides / VideoFiltering with IS NULL / IS NOT NULL
FlashcardIN Operator for Value Lists
FlashcardSorting by Multiple Columns
FlashcardLogical Operators AND, OR, NOT
FlashcardColumn Aliases with AS
FlashcardWHERE Clause for Filtering
FlashcardStatement Termination with Semicolon
FlashcardLIKE Operator and Wildcards
FlashcardSELECT DISTINCT for Unique Values
FlashcardLIMIT Clause to Restrict Rows
FlashcardAscending vs Descending Sort
FlashcardSelecting All Columns with *
FlashcardSelecting Specific Columns
FlashcardString Literals and Quoting
FlashcardORDER BY for Sorting
FlashcardComparison Operators
FlashcardFROM Clause and Table Name
FlashcardBETWEEN Operator for Ranges
FlashcardCase Sensitivity and Conventions
FlashcardSELECT Statement Basic Syntax
FlashcardFiltering Rows With NULL Values
Spot why a WHERE clause comparing a column to NULL returns no rows.
SELECT id, name, email FROM users WHERE email = NULL ORDER BY name ASC;
This query should return users who have no email, but it returns zero rows. What is the bug?