78 items
Filtering 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
QuizSet Membership With IN
QuizLogical Order Of Clauses
QuizSelecting All Columns
QuizSelecting Specific Columns
QuizColumn Aliases With AS
QuizFiltering With WHERE
QuizComparison Operators
QuizCombining With AND / OR
QuizNegating With NOT
QuizRange Filtering With BETWEEN
QuizPattern Matching With LIKE
QuizFiltering NULL Values
QuizSorting With ORDER BY
QuizAscending vs Descending Sort
QuizSorting By Multiple Columns
QuizLimiting Result Rows
QuizString Literals And Quoting
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 / VideoLimiting Returned Rows
Code QuizSorting By Multiple Columns
Code QuizClause Order In A Query
Code QuizRemoving Duplicates With DISTINCT
Code QuizSelecting All Columns
Code QuizSelecting Specific Columns
Code QuizColumn Aliases With AS
Code QuizWHERE Comparison Operator
Code QuizCombining Conditions
Code QuizFiltering Ranges With BETWEEN
Code QuizFiltering With IN
Code QuizPattern Matching With LIKE
Code QuizHandling NULL Values
Code QuizSorting With ORDER BY
Code QuizSorting Descending
Code QuizSelecting Specific Columns by Name
Slides / VideoThe SELECT Statement's Purpose
Slides / VideoWHERE Clause for Filtering
FlashcardSelecting Specific Columns
FlashcardStatement Termination with Semicolon
FlashcardORDER BY for Sorting
FlashcardLIKE Operator and Wildcards
FlashcardLogical Operators AND, OR, NOT
FlashcardColumn Aliases with AS
FlashcardLIMIT Clause to Restrict Rows
FlashcardAscending vs Descending Sort
FlashcardFiltering with IS NULL / IS NOT NULL
FlashcardBETWEEN Operator for Ranges
FlashcardComparison Operators
FlashcardSELECT DISTINCT for Unique Values
FlashcardFROM Clause and Table Name
FlashcardSelecting All Columns with *
FlashcardSELECT Statement Basic Syntax
FlashcardCase Sensitivity and Conventions
FlashcardString Literals and Quoting
FlashcardSorting by Multiple Columns
FlashcardIN Operator for Value Lists
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?