我想从 4 个表中选择数据。我有:
transactions: no_transactions, date, quantity, no_tank, id_cards, no_terminal
tanks: no_tank, type , price, temperature
terminals: no_terminal, location
cards: id_card , no_card , id_person
people: id_person , first_name, last_name
我想从交易中选择所有 no_transactions、日期、数量， 储 jar 的类型、价格、温度，其中 tansk.no_tank = transactions.no_tank 终端位置，其中terminals.no_terminal = transactions.no_terminal 名字、姓氏来自 people.id_person = cards.id_person(但必须是 cards.id_card = transactions.id_cards)。
我该怎么做？
我尝试这样做:
SELECT no_transactions, date, quantity FROM transactions
UNION
SELECT type , price, temperature FROM tanks WHERE tansk.no_tank = transactions.no_tank
UNION
SELECT location FROM terminals WHERE terminals.no_terminal = transactions.no_terminal
UNION
SELECT first_name, last_name FROM people WHERE people.id_person=(select id_person where cards.id_card = transactions.id_cards)
但它不起作用:( 有人可以帮忙吗？
最佳答案
尝试使用以下查询
select no_transactions, date, quantity from transactions, type , price,
temperature,location,first_name, last_name from transactions AS TR
INNER JOIN tanks AS TK on (TR.no_tank=TK.no_tank)
INNER JOIN terminals As TM on (TR.no_terminal=TM.no_terminal)
INNER JOIN cards CD on (TR.id_card=CD.id_card)
INNER JOIN people P on (CD.id_person=P.id_person)
where your condition if you need.
关于mysql - SQL从4个表中选择数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30502031/