SQL Database Language

  1. Aggregate Functions and Data Summarization
    1. Aggregate Function Fundamentals
      1. Aggregate Function Concepts
        1. Set Function Behavior
          1. NULL Value Handling in Aggregates
          2. Common Aggregate Functions
            1. COUNT Function
              1. COUNT(*) Usage
                1. COUNT(column) Usage
                  1. COUNT(DISTINCT) Usage
                    1. NULL Value Considerations
                    2. SUM Function
                      1. Numeric Summation
                        1. NULL Value Handling
                          1. Data Type Considerations
                          2. AVG Function
                            1. Average Calculations
                              1. NULL Value Exclusion
                                1. Precision Considerations
                                2. MIN Function
                                  1. Minimum Value Identification
                                    1. Data Type Compatibility
                                      1. NULL Value Handling
                                      2. MAX Function
                                        1. Maximum Value Identification
                                          1. String and Date Comparisons
                                            1. NULL Value Handling
                                          2. Grouping Data
                                            1. GROUP BY Fundamentals
                                              1. Grouping Concepts
                                                1. Aggregate Context
                                                2. Single Column Grouping
                                                  1. Basic Grouping Syntax
                                                    1. Group Formation Rules
                                                    2. Multiple Column Grouping
                                                      1. Composite Grouping
                                                        1. Group Hierarchy
                                                        2. Grouping by Expressions
                                                          1. Calculated Group Keys
                                                            1. Function-Based Grouping
                                                            2. GROUP BY Rules and Restrictions
                                                              1. SELECT List Restrictions
                                                                1. Non-Aggregate Column Rules
                                                                  1. Functional Dependencies
                                                                2. Filtering Grouped Data
                                                                  1. HAVING Clause Purpose
                                                                    1. HAVING vs WHERE Differences
                                                                      1. Aggregate Conditions
                                                                        1. Complex HAVING Conditions
                                                                          1. Performance Considerations
                                                                          2. Advanced Grouping
                                                                            1. ROLLUP Operations
                                                                              1. Hierarchical Grouping
                                                                                1. Subtotal Generation
                                                                                2. CUBE Operations
                                                                                  1. Multi-Dimensional Grouping
                                                                                    1. Cross-Tabulation
                                                                                    2. GROUPING SETS
                                                                                      1. Custom Grouping Combinations
                                                                                        1. Flexible Aggregation
                                                                                      2. DISTINCT with Aggregates
                                                                                        1. Unique Value Aggregation
                                                                                          1. Performance Implications
                                                                                            1. Use Case Scenarios

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                                                                                          6. Multi-Table Operations and Joins

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                                                                                          8. Subqueries and Nested Queries