MySQL?? ??-?? ??? ???? ?? ? ?? ???? ????? LEFT JOIN? ? ?? ??? ??????
Dec 27, 2024 pm 04:46 PM
??? ?? ??? ?? MySQL LEFT JOIN 3? ???
? ?? ??? ??? ???? ???? ?? ??? ??? ? ????. ??? ???? ??. ?? 'Persons', 'Fears' ? 'Person_Fear' ???? ??? LEFT JOIN ??? ?? ??? ? ????.
'Persons' ????? 'Name' ? 'SS'(??)? ??? ?? ??? ?? ????. ?? ??), 'Fears' ????? ???? ???? ???? 'Person_Fear' ????? ??? ?? ?? ??? ?????.
?? ???? LEFT JOIN ??? ?????? ??? ??????. ??? ??? ??? ??? ????.
SELECT persons.name,
persons.ss,
fears.fear
FROM persons
LEFT JOIN fears
ON person_fear.personid = person_fear.fearid
? ??? ?? ??? 'person_fear'? ? ? ?? ???? ??? ?????. ??, ??? 'PersonID' ?? ???? 'Persons'? 'Person_Fear'? ???? 'FearID'? ???? 'Person_Fear'? 'Fears'? ???? ???.
??? LEFT JOIN ??? ??? ????.
SELECT Persons.Name, Persons.SS, Fears.Fear FROM Persons LEFT JOIN Person_Fear ON Person_Fear.PersonID = Persons.PersonID LEFT JOIN Fears ON Person_Fear.FearID = Fears.FearID
? LEFT JOIN ??? ??? ??? ?? ??? ???? ?? ??? ???? ??? ?????. ???. ?? ???? ? ???? ?? 'Name', 'SS' ? 'Fear' ?? ?????.
?? ?? LEFT JOIN ??? ??? ??? ????.
SELECT Persons.Name, Persons.SS, Fears.Fear
FROM Persons
LEFT JOIN Person_Fear
INNER JOIN Fears ON Person_Fear.FearID = Fears.FearID
ON Person_Fear.PersonID = Persons.PersonID
LEFT JOIN? ????? ?????? ?????? ??? ?? ????? ????? ?? ??? ???? ??? ? ????.
? ??? MySQL?? ??-?? ??? ???? ?? ? ?? ???? ????? LEFT JOIN? ? ?? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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