Giving values to primary key
Let us see how we might provide a value to the primary key in Oracle. There are many ways to provide a value for the primary key. One is to […]
PL SQL that creates a table
The situation is simple. We have to create a table that contain data on a certain variable outcome. Normally, one would like to create a field in the table and […]
Hot backup in Oracle
It is possible to make a hot backup in Oracle. This implies that we do not have to shutdown the database before creating a backup. The steps are as follows: […]
Take latest values
The situation is as follows. We have a table with records that are added over time. The request is to produce a resultset that only contains values that are added […]
Cold backup in Oracle
Actually, taking a cold backup in Oracle is quite simple. If you choose to undertake a cold backup by copying tables, it consists of 5 steps. Step 1 is identifying […]
Changing granularity
Let us suppose, we have a table that has a granularity in two dimensions. Think of a customer and a product dimension. So each record has a combination of customer […]
The ORACLE_HOME
Oracle needs to have a set of context variables that allow Oracle to know where the programmes are located. Upon installation, you have to check if these variabled are set. […]
SQL in steps
Let us assume we have a request to show results from a query that is too massive to run on-line. Let us also assume that we may distinguish in this […]
Writing content from Oracle
This note provides a PL/SQL programme that writes the the content of a table to a file. It also uses a steering table (emp_ids) that contains a series of ids […]
Working with XML in Oracle
Oracle has nice features to export data as an XML file. Let us discuss a few of them. The first one is to use SQL Developer. We could already export […]