使用内部联接在oracle中获取特定的列值

Question

我正在加入两个表格，我正在获取一些列和值

 Select                  
    tbl_orderdetails.category_name,
    tbl_orderdetails.branch_name,
    tbl_ordermaster.created_date,
    tbl_ordermaster.user_id, 
    tbl_orderdetails.order_details_id,
    tbl_orderdetails.branch_id 
 From tbl_orderdetails Inner Join tbl_ordermaster ON 
    tbl_orderdetails.order_master_id=tbl_ordermaster.ordermasterid 
 where tbl_ordermaster.user_id='12'

我希望获得特定分支名称的次数。我使用了计数，但它不起作用，我只希望分支名称的最大次数和前三名显示。 例如：

vellore=100,
chennai=18,
tvl=80,
harithuwar=90 

它应该只显示

vellore
harithwar 
tvl 

示例数据 orderdetails

orderdatailsid | order_master_id | branchname |分类| branchid

1 | 112 | vellore | nad | 123

2 | 112 | vellore |胡| 123

3 | 113 |钦奈| ji | 121

4 | 112 | vellore |嗨| 123

5 | 134 | tvl | ui | 145

6 | 134 | tvl | jo | 145

masterdetails

ordermasterid |用户ID

112 | 12

113 | 13

134 | 14

Answer 1

试试这个

SELECT T.*,S.* FROM
(
  Select TD.category_name,TD.branch_name,TM.created_date,TM.user_id,TD.order_details_id,TD.branch_id
  From tbl_orderdetails TD Inner Join tbl_ordermaster TM ON 
    TD.order_master_id = TM.ordermasterid 
  Where TM.user_id='12'
) T Left Join
(
  Select T1.branch_name,Count(T1.branch_name) As No_Of_Branch
  From tbl_orderdetails T1 Inner Join tbl_ordermaster T2 ON 
       T1.order_master_id = T2.ordermasterid 
  Where T2.user_id='12'
  Group By T1.branch_name
) S On S.branch_name = T.branch_name

<强>更新

如果您想Max count

试试这个

SELECT T.*,S.* FROM
(
  Select TD.category_name,TD.branch_name,TM.created_date,TM.user_id,TD.order_details_id,TD.branch_id
  From tbl_orderdetails TD Inner Join tbl_ordermaster TM ON 
    TD.order_master_id = TM.ordermasterid 
  Where TM.user_id='12'
) T Inner Join
(
SELECT M.branch_name,Max(M.No_Of_Branch) FROM
  (
    Select T1.branch_name,Count(T1.branch_name) As No_Of_Branch
    From tbl_orderdetails T1 Inner Join tbl_ordermaster T2 ON 
         T1.order_master_id = T2.ordermasterid 
    Where T2.user_id='12'
    Group By T1.branch_name
  ) M Group By M.branch_name
) S On S.branch_name = T.branch_name

Answer 2

尝试此计数在示例下工作正常，

create table orderdetails(orderdatailsid number, order_master_id number,branchname varchar(20), category varchar(20), branchid number);
insert into orderdetails values (1 , 112 ,'vellore','nad', 123);
insert into orderdetails values (2 , 112 ,'vellore','hu', 123);
insert into orderdetails values (3 , 113 , 'chennai','ji', 121);
insert into orderdetails values (4 , 112 , 'vellore' ,'hi', 123);
insert into orderdetails values (5 , 134 , 'tvl','ui', 145);
insert into orderdetails values (6 , 134 , 'tvl','jo', 145);
insert into orderdetails values (7 , 113 , 'chennai','ji', 121);
insert into orderdetails values (8 , 112 , 'vellore','hi', 123);
insert into orderdetails values (9 , 134 , 'tvl','ui', 145);

从orderdetails中选择*;

create table masterdetails(ordermasterid number, userid number);
insert into masterdetails values(112 , 12);
insert into masterdetails values(113 , 13);
insert into masterdetails values(134 ,14);

从masterdetails中选择*;

SELECT * FROM (
 SELECT orderdetails.branchname, count(*)   as Cout          
            From orderdetails left Join masterdetails ON 
            orderdetails.order_master_id=masterdetails.ordermasterid 
            group by orderdetails.branchname
            order by cout desc
            ) WHERE ROWNUM <4;