Comparing Two tables with 300k records and update one table
Could you let me know how to compare two tables having 300k records and update one table.below is the scenario.
Table Tabl_1 has columns A,B and Tabl_2 has columns B,new_column.
Column B has same data in both the tables.
I need to update Tabl_2 in new_column with Tabl_1 A column data by comparing B column in both tables.
I m trying to do using PLSQL Tables.
Any suggestion?
Thanks.
Hi,
Whenever you have a problem, please post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) from all tables involved, so that the people who want to help you can re-create the problem and test their ideas.
Also post the results you want from that data, and an explanation of how you get those results from that data, with specific examples.
If you're asking about a DML statement, such as UPDATE, the CREATE TABLE and INSERT statements should re-create the tables as they are before the DML, and the results will be the contents of the changed table(s) when everything is finished.
Always say which version of Oracle you're using (for example, 11.2.0.2.0).
See the forum FAQ: https://forums.oracle.com/message/9362002
ef2019c7-080c-4475-9cf4-2cf1b1057a41 wrote:
Could you let me know how to compare two tables having 300k records and update one table.below is the scenario.
Table Tabl_1 has columns A,B and Tabl_2 has columns B,new_column.
Column B has same data in both the tables.
I need to update Tabl_2 in new_column with Tabl_1 A column data by comparing B column in both tables.
I m trying to do using PLSQL Tables.
Any suggestion?
Thanks.
Why are you trying to use PL/SQL tables? If tabl_1 and tabl_2 are regular database tables, it will be much simpler and faster just to use them.
Depending on your requirements, you can do an UPDATE or MERGE, either in SQL or in PL/SQL.
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HI ,
I have a table called trackCenterline .Below is the table.
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http://social.technet.microsoft.com/Forums/en-US/home?forum=transactsql. It is appropriate and more experts will assist you.
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select TrackCenterline.FeatureId,TrackCenterline.SegmentId,
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AMK100012 10001 2 61.0000 61.3740
AMK100013 10001 3 61.0000 61.3740
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-----Then you can use update select from statement to modify the Mailpost table, Or you can post the table structure of Mailpost
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http://www.techonthenet.com/sql/update.php
Regards,
Sofiya Li
Sofiya Li
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I have a table with 920 records, we need to update the end date to 6/30/2014 for 920 records and I need to create all 920 records with start date is 7/1/2014 and update the external value to
CCC.
Note: the table primary key is not auto increment, but I have sp to get the latest key for that.
Existing table.
ID
Source Name
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External value
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End date
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Source Name
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If I understand what you need then you ask for:
1. updating all current rows (920 rows in the table now)
2. insert new rows which are duplicates of the preiviews rows, but with value 'CCC' insteade of 'BBB'
If so, there is not reason to use a cursor and it is highly NOT RECOMMENDED to use ant type of loop.
You should work with SET and do it all in 2 simple queries:
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UPDATE test
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Please next time post DDL+DML
here is the full code with the DDL+DML that i used:
-- This is our DDL - A create table query:
create table test
( id int identity(1,1) primary key,
SourceName nvarchar(3),
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ExternalValue nvarchar(3),
StartDate date,
EndDate date
go
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while @i < 921
begin
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set @i += 1 ;
end ;
GO
-- Here is the solution for the problem as I understood your needs:
-- first we duplicate the existing rows,
-- but we use the values 'CCC" and '20140107' for the new rows values
INSERT test (SourceName, InternalValue, ExternalValue, StartDate, EndDate)
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SET EndDate = '20140107' -- I use date in format yyyymmdd, You can use other formats as well
where
-- You can use any filter that you need if you dont want to update all rows
InternalValue = 'AAA' and ExternalValue = 'BBB' and StartDate = '20140101' and EndDate = '20140630'
-- Here we just check how the result look like :-)
select *
from test ;
-- And since we do not realy need this table in our server... Here we clean the DDL (you probaby DO NOT WANT TO EXECUTE THIS!)
DROP table test
GO
I hope this was useful :-)
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select 1 invoice_id from dual union all
select 2 invoice_id from dual union all
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14,2,100,B,XY,1
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outer apply (select COALESCE(Column2,Column3) From #temp1 where column1 = parsename(replace(a.colum4,',','.'),2)) a2(C2)
You can also use split function
http://sqlperformance.com/2012/07/t-sql-queries/split-strings
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