我们可以在 MySQL 的 ORDER BY 子句中使用别名字段吗？

Question

Can we use aliased field name in ORDER BY clause?

For example:

SELECT id, name AS firstname
FROM users
ORDER BY firstname

Is it possible? When I tried this it errored out.

Answer 1

An alias can be used in a query select list to give a column a different name. You can use the alias in GROUP BY, ORDER BY, or HAVING clauses to refer to the column.

Checkhere .

Answer 2

您不能在 MS SQL SERVER 的 GROUP BY 子句中使用别名

Answer 3

为了告诉您可以在某些子句中使用别名，请检查 SQL 处理查询的顺序，如下所示： -from -where -group by -have -order by

Answer 4

Yes, you can certainly use column aliases in your "order by" clause.

You can verify it works with the built-in mySql "user" table:

 select User as name,Host from user order by name;

If it "errored out", then something else must have been wrong with your query. Please cut/paste the exact error message.

Answer 5

Try with this one, I have added back-ticks to column name and table Because name is the reserved word :

SELECT `id`, `name` AS firstname
FROM `users`
ORDER BY firstname