Mysql - selecting year from a unix timestamp

Question

I am using this:

SELECT FROM_UNIXTIME(my_unix_timestamp_column, \'%Y\') AS year FROM table_name WHERE year = 2009;

but it gives me an error

Answer 1

SELECT  FROM_UNIXTIME(my_unix_timestamp_column, '%Y') AS `year`
FROM    table_name
HAVING  `year` = 2009

Unlike WHERE clause, HAVING clause can reference the SELECT clause aliases.

More index efficient way would be:

SELECT  FROM_UNIXTIME(my_unix_timestamp_column, '%Y') AS `year`
FROM    table_name
WHERE   my_unix_timestamp_column >= UNIX_TIMESTAMP('2009-01-01')
        AND my_unix_timestamp_column < UNIX_TIMESTAMP('2010-01-01')