Sorting Rows (Visual Database Tools)

Artigo
12/03/2008

You can order the rows in a query result. That is, you can name a particular column or set of columns whose values determine the order of rows in the result set.

Note

The sort order is determined in part by the column's collation sequence. You can change the collation sequence in the Collation Dialog Box.

There are several ways in which you can sort query results:

You can arrange rows in ascending or descending order By default, SQL uses order-by columns to arrange rows in ascending order. For example, to arrange the book titles by ascending price, simply sort the rows by the price column. The resulting SQL might look like this:
```
SELECT *
FROM titles
ORDER BY price
```
On the other hand, if you want to arrange the titles with the more expensive books first, you can explicitly specify a highest-first ordering. That is, you indicate that the result rows should be arranged by descending values of the price column. The resulting SQL might look like this:
```
SELECT *
FROM titles
ORDER BY price DESC
```
You can sort by multiple columns For example, you can create a result set with one row for each author, ordering first by state and then by city. The resulting SQL might look like this:
```
SELECT *
FROM authors 
ORDER BY state, city
```
You can sort by columns not appearing in the result set For example, you can create a result set with the most expensive titles first, even though the prices do not appear. The resulting SQL might look like this:
```
SELECT title_id, title
FROM titles
ORDER BY price DESC
```
You can sort by derived columns For example, you can create a result set in which each row contains a book title — with the books that pay the highest royalty per copy appearing first. The resulting SQL might look like this:
```
SELECT title, price * royalty / 100 as royalty_per_unit
FROM titles
ORDER BY royalty_per_unit DESC
```
(The formula for calculating the royalty that each book earns per copy is emphasized.)
To calculate a derived column, you can use SQL syntax, as in the preceding example, or you can use a user-defined function that returns a scalar value. For more information about user-defined functions, see the SQL Server documentation.
You can sort grouped rows For example; you can create a result set in which each row describes a city, plus the number of authors in that city — with the cities containing many authors appearing first. The resulting SQL might look like this:
```
SELECT city, state, COUNT(*)
FROM authors
GROUP BY city, state
ORDER BY COUNT(*) DESC, state 
```
Notice that the query uses state as a secondary sort column. Thus, if two states have the same number of authors, those states will appear in alphabetical order.
You can sort using international data That is; you can sort a column using collating conventions that differ from the default conventions for that column. For example, you can write a query that retrieves all the book titles by Jaime Patiño. To display the titles in alphabetical order, you use a Spanish collating sequence for the title column. The resulting SQL might look like this:
```
SELECT title
FROM 
    authors 
    INNER JOIN 
        titleauthor 
        ON authors.au_id 
        =  titleauthor.au_id 
        INNER JOIN
            titles 
            ON titleauthor.title_id 
            =  titles.title_id 
WHERE 
     au_fname = 'Jaime' AND 
     au_lname = 'Patiño'
ORDER BY 
     title COLLATE SQL_Spanish_Pref_CP1_CI_AS
```

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Sorting Rows (Visual Database Tools)

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