Efficient way to update all rows in a table

Posted by m_pGladiator on Stack Overflow See other posts from Stack Overflow or by m_pGladiator
Published on 2010-04-14T07:45:33Z Indexed on 2010/04/14 7:53 UTC
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sql

Hi,

I have a table with a lot of records (could be more than 500 000 or 1 000 000). I added a new column in this table and I need to fill a value for every row in the column, using the corresponding row value of another column in this table.

I tried to use separate transactions for selecting every next chunk of 100 records and update the value for them, but still this takes hours to update all records in Oracle10 for example.

What is the most efficient way to do this in SQL, without using some dialect-specific features, so it works everywhere (Oracle, MSSQL, MySQL, PostGre etc.)?

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Efficient way to update all rows in a table - Developer IT

Efficient way to update all rows in a table

sql

Related posts about sql

SQL SERVER – Concat Strings in SQL Server using T-SQL – SQL in Sixty Seconds #035 – Video

SQL SERVER – Concat Function in SQL Server – SQL Concatenation

Error with SQL Server Setup 2012 on Windows 2012

How can I detect which version of SQL (eg SQL 2008 or SQL Azure)

Nested SQL Select statement fails on SQL Server 2000, ok on SQL Server 2005

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