Diskuze: UNION v podotazu + přístup k proměnné aktuálního řádku
Trochu jsem to preformatoval jednim programem. Na chyby v kodu nehled. vidim tyhle problemy
- Treba eliminovat joiny ktere nepotrebujes, Left joiny, pokud je nepotrebujes, tak je pouzij az na konec
curr_client_idje co? To je nejaky sloupec z jake tabulky? Nebo je to cislo z php, treba?
Jestli je to z tabulky, tak musis do toho vnitrniho dotazu tabulku pridat.
SELECT a.`date_from` AS `EVENT_DATE`
FROM `calendar_event` a
LEFT JOIN `list_calendar_event` b ON b.`idlist_calendar_event` = a.`list_calendar_event_idlist_calendar_event`
LEFT JOIN `directory_client` e ON ... -- zmena
--WHERE a.`directory_client_iddirectory_client` = `curr_client_id`
WHERE a.`directory_client_iddirectory_client` = e.`curr_client_id`Nebo, mozna chces neco jineho. Mozna potrebujes selectem vytahnout nejdriv id klikentu a ty pak pouzit v In.
SELECT ... WHERE id IN (SELECT `iddirectory_client` FROM `directory_client`)Ale, to je zbytecne, protoze ziskas stejne vsechny klienty.
3. Hele, a dokazes vysledek te tabulky ziskat treba jinym zpusobem, nekolika
dotazy? Zkus napsat ty. Z toho se to bude pak lepe skladat.
Zatim se v tom ja treba nevyznam, prilis. Ale taky jsem je amater. Neni mi
uplne jasne, jak to myslis s tim
curr_client_id. Trochu se desim predstavy, ze ty chces pouzit promennou z
vysledne tabulky do tabulek, ze kterych ji vytvaris 
-- `calendar_event` a
-- `list_calendar_event` b
-- `directory_branch_office` c
-- `directory_person` d
-- `directory_client` e
-- `directory_address` f
SELECT e.*,
( e.`iddirectory_client` ) AS `CURR_CLIENT_ID`,
(
SELECT `event_date`
FROM (
SELECT a.`date_from` AS `EVENT_DATE`
FROM `calendar_event` a
LEFT JOIN `list_calendar_event` b ON b.`idlist_calendar_event` = a.`list_calendar_event_idlist_calendar_event`
WHERE a.`directory_client_iddirectory_client` = `curr_client_id`
UNION ALL
SELECT a.`date_from` AS `EVENT_DATE`
FROM `calendar_event` a
LEFT JOIN `list_calendar_event` b ON b.`idlist_calendar_event` = a.`list_calendar_event_idlist_calendar_event`
INNER JOIN `directory_branch_office` c ON c.`iddirectory_branch_office` = a.`directory_branch_office_iddirectory_branch_office`
INNER JOIN `directory_client` e ON e.`iddirectory_client` = c.`directory_client_iddirectory_client`
INNER JOIN `directory_address` f ON f.`directory_branch_office_iddirectory_branch_office` = c.`iddirectory_branch_office`
WHERE c.`directory_client_iddirectory_client` = `curr_client_id`
UNION ALL
SELECT a.`date_from` AS `EVENT_DATE`
FROM `calendar_event` a
LEFT JOIN `list_calendar_event` b ON b.`idlist_calendar_event` = a.`list_calendar_event_idlist_calendar_event`
INNER JOIN `directory_person` d ON d.`iddirectory_person` = a.`directory_person_iddirectory_person`
INNER JOIN `directory_client` e ON e.`iddirectory_client` = d.`directory_client_iddirectory_client`
WHERE d.`directory_client_iddirectory_client` = `curr_client_id`
UNION ALL
SELECT a.`date_from` AS `event_date`
FROM `calendar_event` a
LEFT JOIN `list_calendar_event` b ON b.`idlist_calendar_event` = a.`list_calendar_event_idlist_calendar_event`
INNER JOIN `directory_person` d ON d.`iddirectory_person` = a.`directory_person_iddirectory_person`
INNER JOIN `directory_branch_office` c ON c.`iddirectory_branch_office` = d.`directory_branch_office_iddirectory_branch_office`
INNER JOIN `directory_client` e ON e.`iddirectory_client` = c.`directory_client_iddirectory_client`
INNER JOIN `directory_address` f ON f.`directory_branch_office_iddirectory_branch_office` = c.`iddirectory_branch_office`
WHERE e.`iddirectory_client` = `curr_client_id`
) AS `event_tab`
ORDER BY `event_date` DESC
LIMIT 0, 1
)
AS
`last_event_all`zyxzyx:3.10.2018 9:19
Ne, to by bylo moc i na mě .
Zkusím ještě jedno vysvětlení.
Kdybych jednotlivé dotazy, které mám spojeny pomocí UNION dal zvlášť, tak
výsledek budou 4 další sloupce viz níže. A já bych to potřeboval
sjednotit do jednoho sloupce a vybrat jen tu nejnovější událost. Mohl bych
to udělat pak v PHP, ale čekám požadavek na možnost řazení a
filtrování, tak bych to rád nechal na databázi.
[LAST_EVENT_CLIENT] => 2018-09-11 09:30:00
[LAST_EVENT_BRANCH] => 2018-10-11 18:00:00
[LAST_EVENT_PERSON] => 2018-09-20 13:30:00
[LAST_EVENT_BRANCH_PERSON] => 2018-09-25 17:00:00
Zobrazeno 27 zpráv z 27.