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sqluniongroup

發布時間: 2023-05-23 21:40:37

『壹』 sql語句:使用了union all後怎麼分組排序

用子查詢就能實現游改了

給你伏磨桐舉個例子吧,要實現的功能你自己改

selecta,b,cfrom(
selecta,缺坦b,cfromaa
unionall
selecta1asa,b1asb,c1ascfrombb
)agroupbyc

『貳』 怎樣修改多條sql子查詢語句用union把結果集連接起來。

你這部分需要recursive query。
下面是 sample code, 具體邏輯需要你自己添進去,這個可以搜索無限深的層次。
http://blog.mclaughlinsoftware.com/2009/04/03/t-sql-hierarchical-query/

USE AdventureWorks2008R2;
GO
WITH DirectReports (ManagerID, EmployeeID, Title, DeptID, Level)
AS
(
-- Anchor member definition
SELECT e.ManagerID, e.EmployeeID, e.Title, edh.DepartmentID,
0 AS Level
FROM dbo.MyEmployees AS e
INNER JOIN HumanResources.EmployeeDepartmentHistory AS edh
ON e.EmployeeID = edh.BusinessEntityID AND edh.EndDate IS NULL
WHERE ManagerID IS NULL
UNION ALL
-- Recursive member definition
SELECT e.ManagerID, e.EmployeeID, e.Title, edh.DepartmentID,
Level + 1
FROM dbo.MyEmployees AS e
INNER JOIN HumanResources.EmployeeDepartmentHistory AS edh
ON e.EmployeeID = edh.BusinessEntityID AND edh.EndDate IS NULL
INNER JOIN DirectReports AS d
ON e.ManagerID = d.EmployeeID
)
-- Statement that executes the CTE
SELECT ManagerID, EmployeeID, Title, DeptID, Level
FROM DirectReports
INNER JOIN HumanResources.Department AS dp
ON DirectReports.DeptID = dp.DepartmentID
WHERE dp.GroupName = N'Sales and Marketing' OR Level = 0;
GO

『叄』 SQL 如何將一個表中的兩條或多條擁有相同ID的記錄合並為一條

一、創建表:

  • create table stuUnion

    (

    sid int identity primary key,

    cid int,

    id varchar(500)

    )

二、添加數據:

  • insert into stuUnion

    elect 1,'a' union

    select 1,'b' union

    select 2,'c' union

    select 2,'d' union

    select 3,'e' union

    select 3,'f' union

    select 3,'g'

三、用標量函數查詢:

  1. 創建標量函數:

    create function b(@cid int)

    returns varchar(500)

    as

    begin

    declare @s varchar(500)

    select @s=isnull(@s+'','')+rtrim(id)+',' from stuUnion where cid=@cid

    return @s

    end;

  2. 用標量函數查詢:

    select cid,dbo.b(cid) as id from stuUnion group by cid

  3. 用sqlserver的xml:

    select cid,ID=STUFF((select ' '+rtrim(id)+',' from stuUnion where st.cid=cid order by id for XML path('')),1,1,'') from stuUnion st group by cid

『肆』 sql追加查詢中的UNION用法

insert into 月利潤表 (門票收入,食品收入)
SELECT sum(日結算表.售票收入) AS 門票收入,0 AS 食品收入
FROM 日結算表
union
SELECT 0AS 門票收入, sum(商品日結算表.商品銷售收入) AS 食品收入
FROM 商品日結算表;
這樣試試,可以通過增加group 語句來合並成一行

『伍』 請教sql語句的用Union 後的group by 問題

select substring(comon,1,3) aa,count(*) bb
from (
select *
from table1
where xxx in (select xxx from tableA where...))
union
select *
from table1
where xxx in (select xxx from tableB where...))
) group by substring(comon,1,3)

『陸』 sql語句查詢,根據一個表中一個列,該列在兩個不同條件同時滿足的查詢結果

1、在計算機中,打開Foxtable軟體,新建一個表格,比如學生的評價成績表,並輸入數據,如下圖所示。

『柒』 sql server 中union的用法

select * from student 專業='計算機'
union
select * from student 專業='英語'

--上面這個命令中的union表示將兩個select查詢結果合並。

『捌』 關於SQL相同表分組排列組合的問題

  1. 建兩個序列,並通過一個函數調用序列(union 不支持直接使用序列),用於排序。

  2. 先用第二組所有行(3行),union all 3遍第一組第一行(left join 第二組,行數就和第二組一樣了)

  3. 在用第二組所有行(3行),union all 3遍第一組第二行(left join 第二組,行數就和第二組一樣了)

  4. 最後按照序號,組別,編號排序

/*
dropsequenceBig_Letter1;
CreatesequenceBig_Letter1
Incrementby1
Startwith65
Maxvalue999999
Minvalue1
Nocycle
nocache;

dropsequenceBig_Letter2;
CreatesequenceBig_Letter2
Incrementby1
Startwith65
Maxvalue999999
Minvalue1
Nocycle
nocache;

--獲取數列下一個值
createorreplacefunctionget_seq_next(seq_nameinvarchar2)returnnumber
is
seq_valnumber;
begin
executeimmediate'select'||seq_name||'.nextvalfromal'intoseq_val;
returnseq_val;
endget_seq_next;

*/

withtmpas(
select'1'groupid,'1'numfromal
union
select'1','2'fromal
union
select'2','1'fromal
union
select'2','2'fromal
union
select'2','3'fromal
)
selectchr(get_seq_next('Big_Letter1'))xuhao,t1.groupid,t1.num
fromtmpt1wheregroupid='2'
unionall
selectchr(get_seq_next('Big_Letter2'))xuhao,t1.groupid,t1.num
fromtmpt1,tmpt2
wheret1.groupid='1'andt1.num='1'andt2.groupid='2'
union
selectchr(get_seq_next('Big_Letter1'))xuhao,t1.groupid,t1.num
fromtmpt1wheregroupid='2'
unionall
selectchr(get_seq_next('Big_Letter2'))xuhao,t1.groupid,t1.num
fromtmpt1,tmpt2
wheret1.groupid='1'andt1.num='2'andt2.groupid='2'
orderbyxuhao,groupid,num

執行結果如下:

按照這個思路拼動態SQL吧