Organizing and grouping data
We can use the
SELECT statement and its clauses and keywords to organize and summarize data. In this section, we will cover these clauses.
The ORDER BY clause
By default, when you query the data in a table with no clustered index, SQL Server does not guarantee the order in which data is returned and returns rows in a random order. If the table has a clustered index, SQL Server returns the rows in a clustered index order. Therefore, we use the
ORDER BY clause in your
SELECT statements to sort the data returned by the query based on the columns' sort order specified in the
ORDER BY clause. The
ORDER BY clause guarantees the order in which data is returned.
For example, to display a sales representative's sales-related information ...