[EMAIL PROTECTED] wrote:
>> Mark Wilson <[EMAIL PROTECTED]> wrote:
>>> Two related questions.
>>> 1. I have a table with a "date" field. (Ex: '04/13/2002'). I want to get
>>> a list
>>> of all UNIQUE values for that field (many entries from the same day),
>>> i.e., all
>>> days with entries.
>>> **************************************
>>> CREATE TABLE metrics_events_power {
>>> mep_id int(11) NOT NULL auto_increment,
>>> mep_date text,
>>> mep_time time DEFAULT '00:00:00' NOT NULL
>>> }
>>> INSERT INTO metrics_events_power VALUES ('1', '04/13/2002', '10:41:19');
>>> INSERT INTO metrics_events_power VALUES ('1', '04/13/2002', '10:46:19');
>>> INSERT INTO metrics_events_power VALUES ('1', '04/14/2002', '11:51:19');
>>> **************************************
>>>
>>> I want a query that returns for this data '04/13/2002' and '04/14/2002'.
>>
>> Use WHERE clause to set retrieval conditions for rows, f.e WHERE
>> mep_date='04/13/2002' OR mep_date='04/14/2002', and GROUP BY mep_date.
>
> Not exactly. I want the retrieval to be automatic. I don't want to know in
> advance what the unique dates are; I want the query to tell me which
> unique dates exist. So for this data, two dates would be returned. For
> other data, more or fewer dates.
SELECT DISTINCT mep_date FROM metrics_events_power;
--
For technical support contracts, goto https://order.mysql.com/?ref=ensita
This email is sponsored by Ensita.net http://www.ensita.net/
__ ___ ___ ____ __
/ |/ /_ __/ __/ __ \/ / Egor Egorov
/ /|_/ / // /\ \/ /_/ / /__ [EMAIL PROTECTED]
/_/ /_/\_, /___/\___\_\___/ MySQL AB / Ensita.net
<___/ www.mysql.com
--
MySQL General Mailing List
For list archives: http://lists.mysql.com/mysql
To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
