MySQL连接4张表

Question

我在为我的调用管理加入 4 个 mysql 表时遇到问题。

我的表是:

calls:
callId | contactId | companyId | numberId | timestamp | callNote | duration | state

contacts:
contactId | firstName | lastName | companyId | email | contactNote

numbers:
numberId | contactId | number

companies:
companyId | companyName

我需要一个查询给我:

callId | timestamp | duration | number | callNote | state | contactId | firstName | lastName | company | email | contactNote

我认为这是可能的，但我不知道如何。

Answer 1

您应该使用 INNER JOIN 来连接表。例如:

SELECT 
    c.callId, 
    c.timestamp, 
    c.duration, 
    n.number, 
    c.callNote, 
    c.state, 
    c.contactId, 
    c1.firstName,
    c1.lastName, 
    c2.CompanyName as company, 
    c1.email, 
    c1.contactNote
FROM calls c 
INNER JOIN contacts c1 ON c1.contacId = c.contactId
INNER JOIN numbers n ON n.contactId = c1.contactid
INNER JOIN companies c2 ON c2.companyid = c.companyid