Match the codes and copy columns - sql

Question

I am working in SQL Server 2008. I have 2 tables Table1 & Table2.
Table1 has columns
SchoolCode, District, Type, SchoolName
and Table2 has columns
SchoolCode1, District1, Type1, SchoolName1
SchoolCode columns in both tables have the same codes like "1234"; code is the same in both schoolcode columns.
Now I want to copy the District, Type and SchoolName column values from Table1 to Table2 if SchoolCode in both tables is same.
I think the query will use join but I don't know how it works. Any help on how I can do this task?

Answer 1

Maybe use an update statement in join if by copying over you mean updating rows
update t2
set
District1= District,
Type1= Type,
SchoolName1= SchoolName
from Table1 t1
join
Table2 t2
on t1.SchoolCode=t2.SchoolCode1

Answer 2

I could give you a little bit of idea. here is it:
Insert into table2 (District1, Type1, SchoolName1)
SELECT District, Type, SchoolName
FROM table1
where table1.Schoolcode=table2.Schoolcode1

Answer 3

You have to use Inner join to update data from table 1 to table 2, Inner join will join values that are equal. . To learn more about joins, I highly recommend you to read the below article
SQLServer Joins Explained - W3Schools
Please refer the below code, for the convenience I have used the temporary tables..
DECLARE #Table1 TABLE
(
SchoolCode INT,
District VARCHAR(MAX),
Type VARCHAR(MAX),
SchoolName VARCHAR(MAX)
)
DECLARE #Table2 TABLE
(
SchoolCode1 INT,
District1 VARCHAR(MAX),
Type1 VARCHAR(MAX),
SchoolName1 VARCHAR(MAX)
)
INSERT INTO #Table1
( SchoolCode ,District , Type , SchoolName
)
VALUES ( 1 ,'DIS1' ,'X' ,'A'),
( 2 ,'DIS2' ,'Y' ,'B'),
( 3 ,'DIS3' ,'Z' ,'C'),
( 4 ,'DIS4' ,'D' ,'D'),
( 5 ,'DIS5' ,'K' ,'E')
INSERT INTO #Table2
( SchoolCode1 ,District1 , Type1 , SchoolName1
)
VALUES ( 1 ,'DIS1' ,'X' ,'A'),
( 2 ,NULL ,'Z' ,NULL),
( 3 ,'DIS3' ,'Z' ,'C'),
( 4 ,NULL ,'Z' ,'S'),
( 5 ,'DIS5' ,'K' ,'E')
--BEFORE
SELECT * FROM #Table1
SELECT * FROM #Table2
--Logic UPDATE Table 2
UPDATE t2 SET t2.District1 = t1.District,
t2.Type1 = t1.Type,
t2.SchoolName1 = t1.SchoolName
FROM #Table1 t1
INNER JOIN #Table2 t2 ON t1.SchoolCode = t2.SchoolCode1
-- End Logic UPDATE Table 2
--AFTER
SELECT * FROM #Table1
SELECT * FROM #Table2

Answer 4

You can join tables in an UPDATE statement.
Note, I have aliased the tables, table1 and table2 as t1 and t2 respectively.
This is what I did:
create table Table1
(SchoolCode varchar(50),
District varchar(50),[Type] varchar(50),SchoolName varchar(50))
go
create table Table2
(SchoolCode1 varchar(50), District1 varchar(50),[Type1] varchar(50),SchoolName1 varchar(50))
go
insert into table1 values ('1234','District1','High','Cool School')
insert into table1 values ('2222','District2','Lower','Leafy School')
insert into table2 (SchoolCode1) values ('1234')
go
update t2
set District1 = District,
Type1 = [Type],
SchoolName1 = SchoolName
from table1 t1
join table2 t2
on t2.SchoolCode1 = t1.SchoolCode
go
select * from table2
go