Question

In the simple case, assume I have a table that looks like this:

mysql> describe widget;  +---------+--------------+------+-----+---------+-------+ | Field   | Type         | Null | Key | Default | Extra | +---------+--------------+------+-----+---------+-------+ | name    | varchar(255) | YES  |     | NULL    |       |  | enabled | smallint(1)  | YES  |     | NULL    |       |  +---------+--------------+------+-----+---------+-------+ 

Is it possible to get a count of all widgets that are enabled (enabled = 1) in the same query as a count of all widgets?

For instance, if I have 3 widgets totaled and one is enabled, I’d like to get the results of my query back that look like:

mysql> SELECT ... as enabled_count, ... as total_count ... +---------------+-------------+ | enabled_count | total_count | +---------------+-------------+ |             1 |           3 | +---------------+-------------+ 

Answer 1

If enabled is always 1 or 0, you can do:

SELECT     COUNT(*) as total_count,    SUM(enabled) as enabled_count  FROM widget 

If it’s another value, perhaps:

SELECT    COUNT(*) as total_count,    SUM( CASE WHEN enabled in ('enabled value 1', 'enabled value 2')          THEN 1         ELSE 0         END       ) as enabled_count FROM widget