Oracle update statement not updating
If you are not exactly sure what rows will be returned by your WHERE clause of an UPDATE statement, it best to take some precautions prior to executing your UPDATE statement.What I like to do is to first execute a SELECT statement that contains the I plan to use in my WHERE clause of my UPDATE statement.By doing this I have made sure I don’t have a bogus WHERE clause on my UPDATE statement that is going to incorrectly identify rows to be updated in my table.In my examples above I only updated a single column with my UPDATE statement.There may be times when you need to write some code to update a row, or set of rows in a table.This is when you need to know how to use the UPDATE statement to update those rows.Now before updating ’empid’ column in ’emp’ table see the ’emp’ and ’emp_backup’ table records.
In order to update a row in a SQL Server table you will use the UDPATE statement.
In this article I will show you a number of different ways to use the UPDATE statement to modify the data in your SQL Server tables.
There are multiple ways to use the UPDATE statement to update a SQL Server table.
If you want to review the complete syntax of the UPDATE statement then please refer to Books Online.
To properly show you how to use the UPDATE statement I will need to create a few tables to hold some sample data. Below is the code to create my Toy table: In order to show you how to UPDATE a table from data in another table I need to build a second sample data table that I will call New Toy Price.