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Notikumu kalendāra sql pieprasijums


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Ir mysql tabula kurā glabājas notikumi. Katram notikumam ir gan sākuma datums, gan beigu datums.

Ir vajadzīgs parādīt visus pašlaik aktīvos (skatoties pēc datumiem) un turpmākos notikumus. Pašlaik esmu ticis līdz šādam risinājumam:

 

SELECT *
		FROM `events`
		WHERE  active = '1'
		AND (
			(NOW() BETWEEN `from` AND `to`)
			OR (`to` >= NOW() AND `from` <= `to`) 
		)
		GROUP BY `id`
		ORDER BY `from` ASC

 

bet problēma ir tāda, ka notikumu sarakstu vajag izdrukāt sagrupējot pa datumiem sākot ar tekošo datumu. Ja notikums ir sācies pagātne un turpinās nakotnē, tad tas arī ir jāizdrukā pie katra datuma līdz notikuma termiņs ir beidzies.

 

Piemēram:

 

22. aprīlis

-------- 2011-04-20 - 2011-04-25

-------- 2011-04-21 - 2011-04-27

-------- 2011-04-22 - 2011-04-26

23. aprīlis

-------- 2011-04-20 - 2011-04-25

-------- 2011-04-21 - 2011-04-27

-------- 2011-04-22 - 2011-04-26

-------- 2011-04-23 - 2011-04-25

27. aprīlis

-------- 2011-04-21 - 2011-04-27

-------- 2011-04-24 - 2011-04-30

 

Vai ar mysql vispar šādi var sagrupēt? Ceru, ka ideju sapratāt.

Edited by Jackal
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Vari mēģināt tā:

SELECT * FROM 
(SELECT `from` as dAll FROM `events` WHERE `from`>=NOW()
UNION
SELECT `to` FROM `events` WHERE `to`>=NOW()) dta ,
(SELECT *
FROM `events` 
WHERE  (NOW() BETWEEN `from` AND `to`)
OR (`to` >= NOW() AND `from` <= `to`)) dtb
WHERE (dta.dAll<=dtb.`from` AND dta.dAll>=dtb.`to`) OR (dta.dAll>=dtb.`from` AND dta.dAll<=dtb.`to`)

Bet, ja notikumu būs daudz, būs bremzes.

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