如何合并多个表的结果？

Question

我想在给定的日期范围内从多个表中打印数据

表

Users (PF_NO,NAME,DESIGNATION,LEVEL,DUTY_TYPE)
Holiday(id, DATE,PF_NO,Reason)
entry(id, DATE, PF_NO, f1,f2 etc)

我只提到了必填字段，所有表都由PF_NO连接，所以基本上我想获得如下详细信息

| PF_NO | NAME | DESIGNATION |LEVEL |DATE| DUTY |DUTY_TYPE|REASON| F1|F2|

所以这里的情况是，如果用户在给定日期的Holiday表中有条目，那么它将显示No ， REASON将包含Holiday表中的原因，并且REASON后面的字段将为空白，如果他在给定日期中没有条目Holiday表他在表entry有一个条目，然后DUTY将是Yes并且DUTY_TYPE将从users表中打印，并且将打印表entry其他详细信息，并且我想从给定日期生成报告。 请帮我

我试过什么？

NAME_OF_STAFF,PF_NO,DESIGNATION,LEVEL,BASIC,MOBILE,EMAIL 
from user 
Join holidays on(holiday_reason BETWEEN From_Date and To_DATE)


Select NAME_OF_STAFF,PF_NO,DESIGNATION,LEVEL,BASIC,MOBILE,EMAIL 
from user 
join holidays on id,PF_NO 
join holidays_reason on ID 
where date between 

Answer 1

SELECT A.PF_NO,A.NAME,A.DESIGNATION,A.LEVEL,B.DATE,
    CASE WHEN ISNULL(B.id,0)<>0  THEN 'No' 
         WHEN ISNULL(B.id,0)=0  &&  ISNULL(C.id,0)<>0  THEN 'Yes' END Duty, 
    CASE WHEN ISNULL(B.id,0)=0  &&  ISNULL(C.id,0)<>0  THEN ISNULL(A.Duty_type,'') ELSE '' END Duty_type, 
    ISNULL(Reason,'') as Reason, ISNULL(C.F1,'') C.F1,ISNULL(F2,'') F2
FROM user A LEFT JOIN holiday B on B.id = A.PF_NO 
          LEFT JOIN holidays_reason C on C.ID=A.PF_NO
where C.date BETWEEN From_DATE and To_DATE