SQL cross join 問題

sql sqlserver

vivian30433 2021-10-08 16:16:41 ‧ 1383 瀏覽

現在有兩張表格
表格ㄧ Employee

EmpID EmpName Sex
01. 小王男
02 小花女
03 小陳男

表格二請假單 AbsDetail
EmpNo AbsType AbsHour
01 a01 3
02 a02 2
03 a03. 4
01. a02 1

利用Cross join輸出以下結果
EmpID EmpName AbsType AbsHour
01 小王 a01 3
01 小王 a02 1
01 小王 a03 0
02 小花 a01 0
02 小花 a02 2
02 小花 a03 0
03 小陳 a01 0
03 小陳 a02 0
03 小陳 a03 4

可以的話盡量詳細一點我想了好久一直試出來的是
請假類別每一個人都一樣時數他把全部人的同類別時數加起來了加上group by也一樣拜託各位大神了！

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3 個回答

純真的人

iT邦大師 1 級 ‧ 2021-10-08 16:30:15

大概是這樣吧

declare @Employee table(
	EmpID varchar(50)
	,EmpName nvarchar(50)
	,Sex nvarchar(1)
)
insert into @Employee
values('01',N'小王',N'男')
,('02',N'小花',N'女')
,('03',N'小陳',N'男')

declare @AbsDetail table(
	EmpNo varchar(50)
	,AbsType varchar(50)
	,AbsHour int
)
insert into @AbsDetail
values('01','a01','3')
,('02','a02','2')
,('03','a03','4')
,('01','a02','1')

select EmpID
,EmpName
,AbsType
,isNull((
	select sum(AbsHour)
	from @AbsDetail b
	where b.AbsType = k.AbsType
	and a.EmpID = b.EmpNo
),0) AbsHour
from @Employee a
,(
	select AbsType
	from @AbsDetail
	group by AbsType
) k

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一級屠豬士

iT邦大師 1 級 ‧ 2021-10-08 17:05:06

create table Employee(
 EmpID varchar(2)
,EmpName nvarchar(50)
,Sex nvarchar(1)
);

insert into Employee values
 ('01',N'小王',N'男')
,('02',N'小花',N'女')
,('03',N'小陳',N'男');

create table AbsDetail(
 EmpNo varchar(2)
,AbsType varchar(50)
,AbsHour int
);

insert into AbsDetail values
 ('01','a01','3')
,('02','a02','2')
,('03','a03','4')
,('01','a02','1');

with t1 as (
select distinct AbsType
  from AbsDetail
), t2 as (
select EmpID
     , EmpName
     , AbsType
  from t1
     , Employee
)
select EmpID
     , EmpName
     , t2.AbsType
     , coalesce(AbsHour,0)
  from t2
  left join AbsDetail
    on EmpID = EmpNo
   and t2.AbsType = AbsDetail.AbsType
 order by EmpID, t2.AbsType;

Demo

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rogeryao

iT邦超人 8 級 ‧ 2021-10-08 19:00:21

CREATE TABLE Employee (
  EmpID varchar(20),
  EmpName nvarchar(20),
  Sex nvarchar(10));

INSERT INTO Employee
  VALUES ('01', N'小王', N'男'),
  ('02', N'小花', N'女'),
  ('03', N'小陳', N'男');

CREATE TABLE AbsDetail (
  EmpNo varchar(20),
  AbsType varchar(20),
  AbsHour int);

INSERT INTO AbsDetail
  VALUES ('01', 'a01', '3'),
  ('02', 'a02', '2'),
  ('03', 'a03', '4'),
  ('01', 'a02', '1');

SELECT Z.*,SUM(ISNULL(W.AbsHour, 0)) AS AbsHour
FROM (
SELECT DISTINCT X.EmpID,X.EmpName,Y.AbsType
FROM Employee AS X, AbsDetail AS Y) AS Z
LEFT JOIN AbsDetail AS W ON W.EmpNo = Z.EmpID AND W.AbsType = Z.AbsType
GROUP BY Z.EmpID, Z.EmpName, Z.AbsType
ORDER BY Z.EmpID, Z.EmpName, Z.AbsType

Demo