Join multiple tables to create one new table with data from all the other

Question

CREATE TABLE NAME2012 (STOCKNAME2012 VARCHAR(255), VAL2012 FLOAT)
INSERT INTO NAME2012 VALUES (‘Stock3’, 50)
INSERT INTO NAME2012 VALUES (‘Stock2’, 55)
INSERT INTO NAME2012 VALUES (‘Stock4’, 45)
CREATE TABLE NAME2011 (STOCKNAME2011 VARCHAR(255), VAL2011 FLOAT)
INSERT INTO NAME2011 VALUES (‘Stock1’, 56)
INSERT INTO NAME2011 VALUES (‘Stock2’, 48)
INSERT INTO NAME2010 VALUES (‘Stock3’, 59)
CREATE TABLE NAME2010 (STOCKNAME2010 VARCHAR(255), VAL2010 FLOAT )
INSERT INTO NAME2010 VALUES (‘Stock1’, 47)
INSERT INTO NAME2010 VALUES (‘Stock2’, 46)
I would like a new Table STOCKS populated with names of stocks from the other tables as well as values. So I get a new table STOCKS, with data as below.
CREATE TABLE STOCKS (NAME VARCHAR(255), VALUE2012 FLOAT , VALUE2011 FLOAT, VALUE2010 FLOAT)
End result in table STOCKS should be like:
NAME               VALUE2010              VALUE2011             
VALUE2012
Stock1                 47                          
56                            NULL
Stock2                 46                          
48                             50
Stock3                NULL                         59                          
 55
Stock4                NULL                       NULL                         
45
How can I write a T-SQL expression that could do this?

Answer 1

Hi
There must be StockMaster
Try this
CREATE TABLE NAME2012 (
STOCKNAME2012 VARCHAR(255)
,VAL2012 FLOAT
INSERT INTO NAME2012
VALUES (
'Stock3'
,50
INSERT INTO NAME2012
VALUES (
'Stock2'
,55
INSERT INTO NAME2012
VALUES (
'Stock4'
,45
CREATE TABLE NAME2011 (
STOCKNAME2011 VARCHAR(255)
,VAL2011 FLOAT
INSERT INTO NAME2011
VALUES (
'Stock1'
,56
INSERT INTO NAME2011
VALUES (
'Stock2'
,48
CREATE TABLE NAME2010 (
STOCKNAME2010 VARCHAR(255)
,VAL2010 FLOAT
INSERT INTO NAME2010
VALUES (
'Stock1'
,47
INSERT INTO NAME2010
VALUES (
'Stock2'
,46
INSERT INTO NAME2010
VALUES (
'Stock3'
,59
Create table stockMaster(STOCKNAME VARCHAR(255))
go
Insert into stockMaster values('Stock1')
Insert into stockMaster values('Stock2')
Insert into stockMaster values('Stock3')
Insert into stockMaster values('Stock4')
Select Distinct S.STOCKNAME , A.VAL2010 ,B.VAL2011,C.VAL2012 from  stockMaster S
left join NAME2012  C on S.STOCKNAME = C.STOCKNAME2012
left join NAME2011 B on s.STOCKNAME = B.STOCKNAME2011
left join NAME2010 A on s.STOCKNAME = A.STOCKNAME2010
go
Drop table NAME2010
Drop table NAME2011
Drop table NAME2012
Drop table stockMaster 
Mark as Ans if you find it useful
Shridhar J Joshi Thanks a lot