有没有办法在不使用WITH子句的情况下编写此查询

Question

表格account的屏幕截图：

[]

表格trandetails的屏幕截图：

[

问题：编写查询以显示注册为C00001的客户提取的总数和存款总数。为计数指定Trans_Count的别名。

我想减少上述问题的代码行 我写了这个查询
代码：

with t as
(
select acnumber,transaction_type,count(transaction_type) as trans_type 
from trandetails as t
group by transaction_type,acnumber
)
,c as
(
select c.custid,c.acnumber
from account as c
where custid like 'C00001'
)
select c.custid,t.transaction_type,t.trans_type
from t inner join c on c.acnumber = t.acnumber

Answer 1

SELECT c.custid,
       t.transaction_type,
       t.trans_type
FROM account AS c
     INNER JOIN( 
                 SELECT acnumber,
                        transaction_type,
                        COUNT(transaction_type) AS trans_type
                 FROM trandetails
                 GROUP BY transaction_type,
                          acnumber ) t ON c.acnumber = t.acnumber
WHERE c.custid LIKE 'C00001';

如果帐号中的acnumber是唯一的，那么它会更简单：

SELECT c.custid,
       t.transaction_type,
       COUNT(t.transaction_type) AS trans_type
FROM account AS c
     INNER JOIN trandetails AS t ON c.acnumber = t.acnumber
WHERE c.custid LIKE 'C00001'
GROUP BY c.custid,
         t.transaction_type;

Answer 2

尝试此查询

create table tabb (col1 varchar2(20), col2 varchar2(20), test number);

begin
insert into tabb values ('Bala', 'bala',1);
insert into tabb values ('bala', 'Bala',2);
insert into tabb values ('Baba', 'baba',3);
insert into tabb values ('bala', 'Bala',4);
insert into tabb values ('Kumar', 'kumar',5);
end;

select * from tabb where col1 like lower('b%') or col1 like upper('b%') and col2 like lower('b%') or col2 like upper('b%');

Answer 3

您始终可以使用CTE的子查询

select c.custid,
       t.transaction_type,
       t.trans_type
from account c
     inner join (
      select s.acnumber,
             s.transaction_type,
             count(s.transaction_type) as trans_type
      from trandetails as s
      group by s.transaction_type,
               s.acnumber) t on c.acnumber = t.acnumber
where c.custid = 'C00001'

可能您必须使用s.custid = 'C00001'或s.custid like '%C00001%'之类的内容。 like用于搜索某些字符串的内部，而不是直接比较相等。

Answer 4

看看这是不是你想要的：

select a.custid
      ,t.transaction_type
      ,sum(t.transaction_amount) amount
from account a
    ,trandetails t
where t.acnumber = a.acnumber
  and a.custid = 'C00001'
group by a.custid
     ,t.transaction_type;

Answer 5

以下是条件聚合的示例：

copy_to

Answer 6

提示1：尽可能避免使用子查询

提示2：如果不需要，请不要使用LIKE子句 - 在您的情况下似乎＆＃39; =＆＃39;将完成这项工作 - 这是一个小测试样本：

DECLARE @account TABLE (
    custid VARCHAR(20),
    acnumber VARCHAR(20)
)

DECLARE @trandetails TABLE (
    acnumber VARCHAR(20),
    transaction_type VARCHAR(20)
)

INSERT INTO
    @account
VALUES
    ('C00001', 'A00001'),
    ('C00002', 'A00002')

INSERT INTO
    @trandetails
VALUES
    ('A00001', 'Withdrawal'),
    ('A00001', 'Deposit'),
    ('A00002', 'Deposit')

SELECT
    acc.custid,
    td.transaction_type,
    count(td.transaction_type) AS trans_cnt
FROM
    @account acc
    INNER JOIN @trandetails td
        ON acc.acnumber = td.acnumber
WHERE
    acc.custid = 'C00001'
GROUP BY
    acc.custid,
    td.acnumber,
    td.transaction_type