SQL ORDER BY Statement
ORDER BY statement in SQL is used to sort the result set of a query in ascending (
ASC) or descending (
DESC) order. It is used in conjunction with the
SELECT statement and is typically the last clause of the query.
The basic syntax for the
ORDER BY clause is:
SELECT column1, column2 FROM table_name ORDER BY column1 [ASC | DESC], column2 [ASC | DESC];
ORDER BY clause sorts the result set by one or more columns. The columns specified in the
ORDER BY clause must be the same as the column names in the
SELECT clause or the column aliases specified in the
ASC keyword is used to sort the result set in ascending order, and the
DESC keyword is used to sort the result set in descending order. If the
DESC keyword is not specified, the default sort order is ascending (
Here is an example of how you can use the
ORDER BY clause to sort the results of a query:
SELECT * FROM orders ORDER BY date DESC;
In this example, the
ORDER BY clause sorts the result set of the
SELECT statement by the
date column in descending order.
You can also use multiple columns in the
ORDER BY clause. When you sort by multiple columns, the database will first order the result set by the first column, then by the second column, and so on.
SELECT * FROM orders ORDER BY customer_id, order_date;
This will first sort the orders by
customer_id and if there is any repetition of
customer_id it will sort by
It is worth noting that the
ORDER BY clause only affects the way the query results are displayed. The actual data stored in the table is not modified.
Here are some best practices for using the ORDER BY statement in SQL:
Always include an
ORDER BYclause in your SELECT statement to ensure that the results are returned in a predictable and consistent order.
ASCkeyword to sort the results in ascending order and the
DESCkeyword to sort the results in descending order. The default sort order is ascending.
Use the table name or table alias before the column name in the
ORDER BYclause to avoid ambiguity if the same column name is used in multiple tables.
Consider using a combination of columns in the
ORDER BYclause to sort the results based on multiple criteria.
When using the
LIMITclause to limit the number of rows returned, make sure that the rows returned are still in the desired order by using the