mysql查询返回多个结果

Question

我有以下查询，即使我添加了不同的内容，它也会返回带有重复项的360条记录：

SELECT DISTINCT
leads.FirstName,
leads.LastName,
calls.callDate,
calls.callstatus,
calls.calllog,
calls.whoCalled,
notes.Notes,
notes.`TimeStamp`,
messages.sentDate,
messages.`subject`,
messages.greeting,
messages.message,
messages.toEmail,
messages.whoSent
FROM
leads  
left JOIN calls ON calls.LeadID = leads.LeadID 
right join notes on leads.LeadID = notes.LeadID 
right join messages on leads.LeadID = messages.LeadID where leads.leadid = 208

select * from notes where leadid = 208 - 它有3条记录：

select * from messages where leadid = 208它有15条记录

select * from calls where leadid = 208它有8条记录

Answer 1

修改where子句以除去连接表的NULL值

WHERE calls.LeadID IS NOT NULL AND notes.LeadID IS NOT NULL AND 
messages.LeadID IS NOT NULL AND leads.leadid = 208