Dividing Data into Groups
You might need to divide a table of information into groups to produce meaningful results when using group functions. For example, you might want to find the average salary for each department or the oldest hire in each job category.
GROUP BY Clause
You use the GROUP BY clause to organize rows in a table into groups. You can then use the group functions to return information for each group. For example, you can group data in the EMPLOYEES table by department number and then return the average salary for each department.
Creating Groups: Part 1
Sunday, January 31, 2010
by
Abdul Majid Niazi
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2010
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January
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- Creating Groups: Part 1
- Using the Grouping Functions
- Group Functions: Part 2
- Group Functions: Part 1
- Group Functions: Part 1
- Working with Groups of Data
- Using the NVL Function
- Using the NVL Function
- Formatting Dates
- Formatting Dates
- Using Date Functions
- Date Functions: Part 2
- Date Functions: Part 1
- Using Numeric Functions
- Number Functions
- Using Character Functions
- Character Functions: Part 2
- Character Functions: Part 1
- Using Functions to Customize Reports
- Joining Multiple Tables
- Joining Multiple Tables
- Applying Additional Conditions to a Join
- Applying Additional Conditions to a Join
- Joining Tables and Identifying Columns
- Joining Tables and Identifying Columns
- Simple Joins
- Simple Joins
- Joining Tables
- Retrieving Rows
- Retrieving Rows
- Retrieving Columns
- Retrieving Columns
- Writing a Basic Query
- Writing a Basic Query
- Building Queries
- Building Queries: Part 2
- Building Queries
- Accessing Data
- Removing a Copy of a Table
- Removing Tables
- Implementing Business Rules
- Creating Constraints
- Identifying Constraints
- Managing Constraints
- Adding a New Column
- Modifying Tables
- Creating a Copy of a Table
- Creating Tables Using SQL
- Creating Tables by Using the Object Browser
- Creating Tables
- Working with Database Objects
- Relational data base
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