Best way to copy date from one table to some others - sql

Question

I have this table:
ID
Name
Role
1
Tom
Admin
2
Tom
User
3
John
Admin
From this table I need to copy the data into the two tables like this:
User:
ID
Name
1
Tom
2
John
UserRole:
UserID
RoleID
1
Admin
1
User
2
Admin
How can I do it in a stored procedure?

Answer 1

You can use queries:
insert into user (name)
select distinct name
from following;
insert into userrole (userid, roleid)
select u.userid, f.roleid
from following f join
user u
on f.name = u.name;
These can be incorporated into a stored procedure.

Answer 2

you can also try merge add,update, delete. Merge uses the composite index or primary key to find matching rows. This is a data warehouse way of etl. you may have to set identity off for a primary key.
use MyDataDB
declare #Output as varchar(max)
declare #ColumnName as varchar(100)
declare #TableName as varchar(30)='your_table_name'
declare #UpdateStatement as varchar(max)=''
declare #InsertStatement as varchar(max)=''
declare #InsertStatement2 as varchar(max)=''
declare #DeleteStatement as varchar(max)=''
Declare #Join as varchar(max)
declare #JoinColumns Table(ColumnName varchar(50))
---- Add your primary Key here or composite index
Insert into #JoinColumns(ColumnName)
values('YourKeyID')
select #Join=
(select ' AND TARGET.'+ColumnName+'=SOURCE.'+ColumnName from #JoinColumns for xml path(''))
select #Join=right(#Join,len(#Join)-5)
declare c1 cursor
for
SELECT
COLUMN_NAME
FROM
INFORMATION_SCHEMA.COLUMNS
WHERE
TABLE_NAME = #TableName
open c1
fetch next from c1 into #ColumnName
set #Output=N'MERGE ReportData.dbo.'+ #TableName + ' as TARGET USING ReportData.dbo.' + #TableName + '_Stage as SOURCE ON
(' + #Join +') WHEN MATCHED THEN ';
set #UpdateStatement=N' UPDATE SET ';
set #InsertStatement =N' WHEN NOT MATCHED BY TARGET THEN INSERT(';
set #InsertStatement2=N' Values(';
set #DeleteStatement=N' WHEN NOT MATCHED BY SOURCE THEN DELETE';
while ##FETCH_STATUS=0
begin
if not exists(select '' from #JoinColumns where ColumnName=#ColumnName)
begin
if #UpdateStatement=N' UPDATE SET '
SET #UpdateStatement=#UpdateStatement + 'TARGET.' + #ColumnName+'='+'SOURCE.'+#ColumnName
else
SET #UpdateStatement=#UpdateStatement + ',TARGET.' + #ColumnName+'='+'SOURCE.'+#ColumnName
end
if #InsertStatement =N' WHEN NOT MATCHED BY TARGET THEN INSERT('
BEGIN
Set #InsertStatement=#InsertStatement+#ColumnName
Set #InsertStatement2=#InsertStatement2+'SOURCE.'+#ColumnName
END
ELSE
BEGIN
Set #InsertStatement=#InsertStatement+','+#ColumnName
Set #InsertStatement2=#InsertStatement2+',SOURCE.'+#ColumnName
END
fetch next from c1 into #ColumnName
end
close c1
deallocate c1
SET #Output=#Output + #UpdateStatement
SET #Output=#Output + #InsertStatement+') '
SET #Output=#Output + #InsertStatement2+') '
SET #Output=#Output + #DeleteStatement+';'
select #Output