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842What is a Database?
843Relational Database Concepts
844What is SQL?
845Database Management Systems (DBMS)
846Tables, Schemas, and Data Types
847Basic SQL Syntax Rules
848Your First SQL Query
849The SELECT Statement: Retrieving Data
850FROM Clause: Specifying Data Sources
851Selecting All Columns with Asterisk
852Selecting Specific Columns
853Column Aliases with AS
854Writing Your First Complete Query
855Introduction to the WHERE Clause
856Comparison Operators: Equals and Not Equals
857Comparison Operators: Greater and Less Than
858Filtering Text with LIKE and Wildcards
859IN Operator for Multiple Values
860BETWEEN Operator for Ranges
861Filtering NULL Values
862Case Sensitivity in Text Filtering
863Filtering Dates and Timestamps
864Best Practices for WHERE Clauses
865Introduction to Logical Operators in SQL
866The AND Operator
867The OR Operator
868The NOT Operator
869Combining Multiple Logical Operators
870Operator Precedence and Parentheses
871NULL Handling with Logical Operators
872Common Logical Operator Patterns
873Understanding DISTINCT: Removing Duplicate Rows
874DISTINCT with Multiple Columns
875ORDER BY Basics: Sorting Query Results
876Sorting with Multiple Columns and NULL Handling
877LIMIT: Restricting the Number of Rows Returned
878OFFSET: Skipping Rows for Pagination
879Combining DISTINCT, ORDER BY, and LIMIT
880Performance Considerations and Best Practices

842What is a Database?
843Relational Database Concepts
844What is SQL?
845Database Management Systems (DBMS)
846Tables, Schemas, and Data Types
847Basic SQL Syntax Rules
848Your First SQL Query
849The SELECT Statement: Retrieving Data
850FROM Clause: Specifying Data Sources
851Selecting All Columns with Asterisk
852Selecting Specific Columns
853Column Aliases with AS
854Writing Your First Complete Query
855Introduction to the WHERE Clause
856Comparison Operators: Equals and Not Equals
857Comparison Operators: Greater and Less Than
858Filtering Text with LIKE and Wildcards
859IN Operator for Multiple Values
860BETWEEN Operator for Ranges
861Filtering NULL Values
862Case Sensitivity in Text Filtering
863Filtering Dates and Timestamps
864Best Practices for WHERE Clauses
865Introduction to Logical Operators in SQL
866The AND Operator
867The OR Operator
868The NOT Operator
869Combining Multiple Logical Operators
870Operator Precedence and Parentheses
871NULL Handling with Logical Operators
872Common Logical Operator Patterns
873Understanding DISTINCT: Removing Duplicate Rows
874DISTINCT with Multiple Columns
875ORDER BY Basics: Sorting Query Results
876Sorting with Multiple Columns and NULL Handling
877LIMIT: Restricting the Number of Rows Returned
878OFFSET: Skipping Rows for Pagination
879Combining DISTINCT, ORDER BY, and LIMIT
880Performance Considerations and Best Practices

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Lesson 873 of 2,145·22. SQL FoundationsPro lesson

Understanding DISTINCT: Removing Duplicate Rows

Learn how DISTINCT eliminates duplicate rows from query results and when to use it for unique value analysis.

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