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␡- Sorting Rows with ORDER BY
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This chapter is from the book SQL: Visual QuickStart Guide, 3rd Edition
This chapter is from the book
This chapter is from the book
Sorting Rows with ORDER BY
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Rows in a query result are unordered, so you should view the order in which rows appear as being arbitrary. This situation arises because the relational model posits that row order is irrelevant for table operations. You can use the ORDER BY clause to sort rows by a specified column or columns in ascending (lowest to highest) or descending (highest to lowest) order; see the “Sort Order” sidebar in this section. The ORDER BY clause always is the last clause in a SELECT statement.
To sort by a column:
- Type:columns is one or more comma-separated column names, sort_column is the name of the column on which to sort the result, and table is the name of the table that contains columns and sort_column. (sort_column doesn’t have to be in listed in columns.) Specify ASC for an ascending sort or DESC for a descending sort. If no sort direction is specified, ASC is assumed (Listings 4.10 and 4.11, Figures 4.10 and 4.11).
Listing 4.10. List the authors’ first names, last names, cities, and states, sorted by ascending last name. ORDER BY performs ascending sorts by default, so the ASC keyword is optional. (In practice, ASC typically is omitted.) See Figure 4.10 for the result.
Figure 4.10 Result of Listing 4.10. This result is sorted in ascending last-name order.
Listing 4.11. List the authors’ first names, last names, cities, and states, sorted by descending first name. The DESC keyword is required. See Figure 4.11 for the result.
Figure 4.11 Result of Listing 4.11. This result is sorted in descending first-name order. The first name of the author Kellsey is an empty string (') and sorts last (or first in ascending order).
To sort by multiple columns:
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- Type:columns is one or more comma-separated column names; sort_column1, sort_column2, .., sort_columnN are the names of the columns on which to sort the result; and table is the name of the table that contains columns and the sort columns. (The sort columns don’t have to be in listed in columns.) Rows are sorted first by sort_column1; then rows that have equal values in sort_column1 are sorted by the values in sort_column2, and so on. For each sort column, specify ASC for an ascending sort or DESC for a descending sort. If no sort direction is specified, ASC is assumed (Listing 4.12 and Figure 4.12).
Listing 4.12. List the authors’ first names, last names, cities, and states, sorted by descending city within ascending state. See Figure 4.12 for the result.
Figure 4.12 Result of Listing 4.12.
SQL lets you specify relative column-position numbers instead of column names in ORDER BY. The position numbers refer to the columns in the result, not the original table. Using column positions saves typing, but the resulting code is unclear and invites mistakes if you reorder the columns in the SELECT clause.
To sort by relative column positions:
- Type: Skype 6.9.0.106 for mac.columns is one or more comma-separated column names; and sort_num1, sort_num2, .., sort_numN are integers between 1 and the number of columns in columns, inclusive. Each integer specifies the relative position of a column in columns. table is the name of the table that contains columns. (The sort numbers can’t refer to a column that’s not listed in columns.) The sort order is the same order described in “To sort by multiple columns” earlier in this section (Listing 4.13 and Figure 4.13).
Listing 4.13. List each author’s first name, last name, city, and state, sorted first by ascending state (column 4 in the SELECT clause) and then by descending last name within each state (column 2). See Figure 4.13 for the result.
Figure 4.13 Result of Listing 4.13.
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