SQL 多表 Full JOIN???

[fzcheng]

表1：
SOID Quantity
061601 500
061602 200

表2：
ShipmentID SOID Quantity
1 061601 300
2 061601 200

查询得到的表：
SOID Quantity ShipMentID ShipmentQty
061601 500 1 300
061601 500 2 200
061602 200 null null

大家帮下忙哦。我记得这种好像可以用full join
但是这个知识点还没有完全体会，希望大家给点提示哦。SQL2005

[chuifengde]

select coalesce(a.SOID,b.SOID) SOID,
       coalesce(a.Quantity,b.Quantity) Quantity,
       ShipmentID,
       ShipmentQty
from 表1 a full join 表2 b
on a.SOID=b.SOID

[青锋-SS]

--left join就可以
create table a(SOID varchar(6),Quantity int)
create table b(ShipmentID int,SOID varchar(6),Quantity int)
go
insert into a
select '061601',500
union select '061602',200
go
insert into b
select 1,'061601',300
union select 2,'061601',200
go
select a.*,b.* from a left join b on a.soid=b.soid
go
drop table a,b
go


（所影响的行数为 2 行）


（所影响的行数为 2 行）

SOID   Quantity    ShipmentID  SOID   Quantity    
------ ----------- ----------- ------ ----------- 
061601 500         1           061601 300
061601 500         2           061601 200
061602 200         NULL        NULL   NULL

（所影响的行数为 3 行）

[fzcheng]

有没有简单点的知识点哦。。55555

[ai_li7758521]

select a.SOID,a.Quantity,b.ShipMentID,ShipmentQty =b.Quantity
from tb1 a left join tb2 b on a.SOID=b.SOID

[lgx0914]

SOID  Quantity 
create table 表1(soid varchar(8),Quantity	int)
insert into 表1 values('061601',500)
insert into 表1 values('061602',200)

create table 表2(ShipmentID int,soid varchar(8),Quantity	int)
insert into 表2 values(1,'061601',300)
insert into 表2 values(1,'061601',200)
select a.soid,a.quantity as quantity,ShipmentID,b.Quantity as ShipmentQty 
from 表1 a full join 表2 b on a.soid=b.soid

[青锋-SS]

select a.*,b.ShipmentID,b.Quantity from a left join b on a.soid=b.soid
--结果
SOID   Quantity    ShipmentID  Quantity    
------ ----------- ----------- ----------- 
061601 500         1           300
061601 500         2           200
061602 200         NULL        NULL

[百年树人]

---测试数据---
if object_id('[表1]') is not null drop table [表1]
go
create table [表1]([SOID] varchar(6),[Quantity] int)
insert [表1]
select '061601',500 union all
select '061602',200
if object_id('[表2]') is not null drop table [表2]
go
create table [表2]([ShipmentID] int,[SOID] varchar(6),[Quantity] int)
insert [表2]
select 1,'061601',300 union all
select 2,'061601',200
 
---查询---
select 
  isnull(a.SOID,b.SOID) as SOID,
  isnull(a.Quantity,b.Quantity) as Quantity,
  b.ShipMentID,
  b.Quantity as ShipmentQty 
from
  表1 a
full join 
  表2 b
on
  a.SOID=b.SOID 

---结果---
SOID   Quantity    ShipMentID  ShipmentQty 
------ ----------- ----------- ----------- 
061601 500         1           300
061601 500         2           200
061602 200         NULL        NULL

（所影响的行数为 3 行）

[ai_li7758521]

DECLARE 
@TA TABLE (IDA INT,VA VARCHAR(10))
DECLARE
@TB TABLE (IDB INT,VB VARCHAR(10))

INSERT INTO @TA 
SELECT
1,'AA' UNION SELECT
2,'BC' UNION SELECT
3,'CCC'

INSERT INTO @TB
SELECT 
1,'2'  UNION SELECT
3,'58' UNION SELECT
4,'67' 

--内联接简单写法
SELECT A.IDA,A.VA,B.IDB,B.VB FROM @TA A,@TB B
WHERE A.IDA=B.IDB

--内联接
SELECT A.IDA,A.VA,B.IDB,B.VB FROM @TA A INNER JOIN @TB B
ON A.IDA=B.IDB

SELECT A.IDA,A.VA,B.IDB,B.VB FROM @TA A JOIN @TB B
ON A.IDA=B.IDB

--左外联接
SELECT A.IDA,A.VA,B.IDB,B.VB FROM @TA A LEFT JOIN @TB B
ON A.IDA=B.IDB

SELECT A.IDA,A.VA,B.IDB,B.VB FROM @TA A LEFT OUTER JOIN @TB B
ON A.IDA=B.IDB

--右外联接
SELECT A.IDA,A.VA,B.IDB,B.VB FROM @TA A RIGHT JOIN @TB B
ON A.IDA=B.IDB

SELECT A.IDA,A.VA,B.IDB,B.VB FROM @TA A RIGHT OUTER JOIN @TB B
ON A.IDA=B.IDB

--完整外联接
SELECT A.IDA,A.VA,B.IDB,B.VB FROM @TA A FULL JOIN @TB B
ON A.IDA=B.IDB

SELECT A.IDA,A.VA,B.IDB,B.VB FROM @TA A FULL OUTER JOIN @TB B
ON A.IDA=B.IDB


--交叉联接
SELECT A.IDA,A.VA,B.IDB,B.VB FROM @TA A CROSS JOIN @TB B

--自联接
SELECT A.IDA,A.VA,B.IDA,B.VA FROM @TA A,@TA B WHERE A.IDA=B.IDA+1



查询分析器中执行：
--建表table1,table2：
create table table1(id int,name varchar(10))
create table table2(id int,score int)
insert into table1 select 1,'lee'
insert into table1 select 2,'zhang'
insert into table1 select 4,'wang'
insert into table2 select 1,90
insert into table2 select 2,100
insert into table2 select 3,70
如表
-------------------------------------------------
table1|table2|
-------------------------------------------------
idname|idscore|
1lee|190|
2zhang|2100|
4wang|370|
-------------------------------------------------

以下均在查询分析器中执行

一、外连接
1.概念：包括左向外联接、右向外联接或完整外部联接

2.左连接：left join 或 left outer join
(1)左向外联接的结果集包括 LEFT OUTER 子句中指定的左表的所有行，而不仅仅是联接列所匹配的行。如果左表的某行在右表中没有匹配行，则在相关联的结果集行中右表的所有选择列表列均为空值(null)。
(2)sql语句
select * from table1 left join table2 on table1.id=table2.id
-------------结果-------------
idnameidscore
------------------------------
1lee190
2zhang2100
4wangNULLNULL
------------------------------
注释：包含table1的所有子句，根据指定条件返回table2相应的字段，不符合的以null显示

3.右连接：right join 或 right outer join
(1)右向外联接是左向外联接的反向联接。将返回右表的所有行。如果右表的某行在左表中没有匹配行，则将为左表返回空值。
(2)sql语句
select * from table1 right join table2 on table1.id=table2.id
-------------结果-------------
idnameidscore
------------------------------
1lee190
2zhang2100
NULLNULL370
------------------------------
注释：包含table2的所有子句，根据指定条件返回table1相应的字段，不符合的以null显示

4.完整外部联接:full join 或 full outer join 
(1)完整外部联接返回左表和右表中的所有行。当某行在另一个表中没有匹配行时，则另一个表的选择列表列包含空值。如果表之间有匹配行，则整个结果集行包含基表的数据值。
(2)sql语句
select * from table1 full join table2 on table1.id=table2.id
-------------结果-------------
idnameidscore
------------------------------
1lee190
2zhang2100
4wangNULLNULL
NULLNULL370
------------------------------
注释：返回左右连接的和（见上左、右连接）

二、内连接
1.概念：内联接是用比较运算符比较要联接列的值的联接

2.内连接：join 或 inner join 

3.sql语句
select * from table1 join table2 on table1.id=table2.id
-------------结果-------------
idnameidscore
------------------------------
1lee190
2zhang2100
------------------------------
注释：只返回符合条件的table1和table2的列

4.等价（与下列执行效果相同）
A:select a.*,b.* from table1 a,table2 b where a.id=b.id
B:select * from table1 cross join table2 where table1.id=table2.id  (注：cross join后加条件只能用where,不能用on)

三、交叉连接(完全)

1.概念：没有 WHERE 子句的交叉联接将产生联接所涉及的表的笛卡尔积。第一个表的行数乘以第二个表的行数等于笛卡尔积结果集的大小。（table1和table2交叉连接产生3*3=9条记录）

2.交叉连接：cross join (不带条件where...)

3.sql语句
select * from table1 cross join table2
-------------结果-------------
idnameidscore
------------------------------
1lee190
2zhang190
4wang190
1lee2100
2zhang2100
4wang2100
1lee370
2zhang370
4wang370
------------------------------
注释：返回3*3=9条记录，即笛卡尔积

4.等价（与下列执行效果相同）
A:select * from table1,table2

[fzcheng]

是哦。晕死。思想混乱，left join 也是可以的哦。

[--小F--]

----------------------------------------------------------------
-- Author :fredrickhu(小F 向高手学习)
-- Date   :2009-06-17 10:58:03
----------------------------------------------------------------
--> 测试数据：[a1]
if object_id('[a1]') is not null drop table [a1]
create table [a1]([SOID] varchar(6),[Quantity] int)
insert [a1]
select '061601',500 union all
select '061602',200
--> 测试数据：[b2]
if object_id('[b2]') is not null drop table [b2]
create table [b2]([ShipmentID] int,[SOID] varchar(6),[Quantity] int)
insert [b2]
select 1,'061601',300 union all
select 2,'061601',200
--------------开始查询--------------------------
select a1.*,b2.* from a1  left join b2 on a1.soid=b2.soid
----------------结果----------------------------
/*SOID   Quantity    ShipmentID  SOID   Quantity    
061601	500	1	061601	300
061601	500	2	061601	200
061602	200	NULL	NULL	NULL

*/

[yuanyulin2009]

select 表一.SOID ,表一.Quantity, 表二 .ShipMentID ,表二 . ShipmentQty
from 表一 FULL OUTER JOIN 表二 on 表一.SOID=表二.SOID

[xingn]

[Quote=引用 2 楼 sdhylj 的回复:]
SQL code
--left join就可以
create table a(SOID varchar(6),Quantity int)
create table b(ShipmentID int,SOID varchar(6),Quantity int)
go
insert into a
select '061601',500
union select '061602',200
go
insert into b
select 1,'061601',300
union select 2,'061601',200
go
select a.*,b.* from a left join b on a.soid=b.soid
go
drop table a,b
go


（所影响的行数为 2 行）


（所影响的行…
[/Quote]
up

[仙道彰]

use Practice
if object_id('tb1') is not null
drop table tb1
go
create table tb1(SOID varchar(10),Quantity varchar(10) )
insert into tb1 select '061601','500' 
union select '061602','200' 
go
if object_id('tb2') is not null
drop table tb2
go
create table tb2(ShipmentID int, SOID varchar(10),Quantity varchar(10))
insert into tb2 select 1,'061601','300' 
union select 2,'061601','200'
go
select tb1.*,tb2.* from tb1 left join tb2 on tb1.SOID=tb2.SOID

SOID Quantity ShipmentID SOID Quantity
---------- ---------- ----------- ---------- ----------
061601 500 1 061601 300
061601 500 2 061601 200
061602 200 NULL NULL NULL

(3 行受影响)

[仙道彰]

速度太慢了，牛牛们速度太惊人了。。。又抢不到分了，不过是自己写的，呵呵就当是练习了。。。