sql joins 需要进一步的帮助

Question

我被困在一个查询上，我想在其中显示来自不同表及其桥表的数据。
这些表是：

bridge (bid,planid,fbridgeid)
fbridge (fbridgeid,featureid,valueid)
features (featureid,fname)
value (valueid,value)
plans (planid,name,price,discount)

以下是我到目前为止的查询：

SELECT 
(NAME AS pname, price AS prize,
 discount AS ds, fname AS feature, VALUE AS vlue 
FROM plans  )

我想从数据库中获取所有列，但根据计划

like planid 1 ->> contains ->> feature id 1,2,3 and valueid 1,3,5 etc )

Answer 1

Join将是：

SELECT pl.name AS pname, pl.price AS prize , pl.discount AS ds , fe.fname AS feature, va.VALUE AS vlue
FROM plans pl
JOIN bridge br ON br.planid = pl.planid
JOIN fbridge fb ON fb.fbridgeid = br.fbridgeid
JOIN features fe ON fe.featureid = fb.featureid
JOIN value va ON va.valueid = fb.valueid
WHERE pl.plainid = 1

Answer 2

在正确的字段上加入您的表格。

SELECT *
FROM plans p
INNER JOIN bridge b ON p.planid = b.planid
INNER JOIN fbridge fb ON b.fbridgeid = fb.fbridgeid
INNER JOIN features f ON fb.featureid = f.featureid
INNER JOIN value v ON fb.valueid = v.valueid

然后您可以从所有字段中选择任何字段。

SELECT p.name AS pname, p.price AS prize, p.discount AS ds, f.fname AS feature, v.value AS vlue
FROM plans p
INNER JOIN bridge b ON p.planid = b.planid
INNER JOIN fbridge fb ON b.fbridgeid = fb.fbridgeid
INNER JOIN features f ON fb.featureid = f.featureid
INNER JOIN value v ON fb.valueid = v.valueid

Answer 3

select b.bid,b.planid,b.fbridgeid,fb.fbridgeid,f.featureid,f.fname,v.valueid,v.value,p.name,p.price,p.discount from bridge as b 
inner join fbridge as fb on fb.bridgeid=b.bridgeid 
inner join features as f on f.featureId=fb.featureid 
inner join value as v on v.valueid=fb.valueid 
inner join plans as p on p.planid=b.planid 
where p.planid=1 and f.featureId in (1,2,3) and v.valueid in (1,3,5)