Updating multiple rows in oracle
I have about 60,000 rows that I'm needing to update the information from column_a to column_b.
For example, 60,000 customers need their arrival_time to match their departure_time.
Suppose we have two tables Categories and Categories_Test. The common column in the two tables is CATEGORY_ID. Please note that query below is used for illustration purpose because Category_ID alone is primary key.
We are going to update column DESCRIPTION and PICTURE in table Categories_Test by using data in table Categories, based on data in the common column CATEGORY_ID. Update data in a column in table A based on a common column in table B. Update data in two columns in table A based on a common column in table B. Conditionally update data in table A based on a common column in table B. No portion may be reproduced without my written permission.
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Cross table update (also known as correlated update, or multiple table update) in Oracle uses non-standard SQL syntax format (non ANSI standard) to update rows in another table. Update data in table A based on two or more common columns in table B.The differences in syntax are quite dramatic compared to other database systems like MS SQL Server or My SQL. Updates based on two or more common columns are normally used for tables where multiple columns work together as a primary key (known as composite primary key).In this article, we are going to look at four scenarios for Oracle cross table update. Category_ID) where exists ( select * from Categories b where b. These columns uniquely identify a record in a table.This was what I used to update 1 of the records, I'm using Oracle SQL: Cloyd, the description is indeed confusing. Please, shall you consider this worth, comment out and I'll keep editing the answer until we get 'there'.
» UPDATE: Update a partitioned table » UPDATE: Update based on a record » UPDATE: Update Object Table » UPDATE: with RETURNING clause » UPDATE: Nested Table Update example » UPDATE: Correlated Update » UPDATE: Update from a SELECT statement » UPDATE: based on multiple returned val...The update query below shows that the PICTURE column is updated by looking up the same ID value in CATEGORY_ID column in table Categories_Test and Categories. If you need to update multiple columns simultaneously, use comma to separate each column after the SET keyword. Here we only want to update PICTURE column in Categories_Test table where the data in Category_Name column is Seafood in table Categories. Software and hardware names mentioned on this site are registered trademarks of their respective companies.