A view can be created even if the defining query of the view cannot be executed, as long as the CREATE VIEW command has no syntax errors. We call such a view a view with errors. For example, if a view refers to a non-existent table or an invalid column of an existing table, or ...
The insert statement adds a new row or rows in a table in theOracle database. We generally use it after we have created a table in the database. One important point to remember is that while inserting records into a table, we must provide a value for every NOT NULL value. Let us lo...
In this tutorial, I would like to show you how to view and edit table and column comments withMySQL Workbench- a free MySQL development and management tool from Oracle. Viewing comments Let's start with finding existing comments. I assume you are already connected to your database and schema...
We can use the view according to the access we have to the Oracle database. Now I am going to explain how to check all constraints on a table in Oracle using the examples Table of Contents How to find all constraints on a table in oracle How to find constraint by name in Oracle How...
Examples of Oracle Partition Let us now look into a few examples so that we can get a better understanding of the concept. Examples #1 – Using Partition by Range to Create a Table In this section, we are going to create a table using the partition by range concept. Let us look at th...
Suppose you wish to take a expdp backup of a big table, but you don’t sufficient space in a single mount point to keep the dump. In this case we take expdp dump to multiple directory. DEMO: Create 2 directories: SQL> create directory DIR1 as '/home/oracle/DIR1'; ...
You may notice that there are four columns returned when using theINFORMATION_SCHEMA.TABLESview, but the most important column isTABLE_TYPE, which determines whether the table in that row is an actual table (BASE TABLE) or a view (VIEW). ...
These change the objects in your database. Oracle Database runs a commit before and after DDL. So if the create works, it's saved to your database.You can also create a table based on a select statement. This makes a table with the same columns and rows as the source query. T...
ALTER TABLE t1 ADD c1 INT DEFAULT 1 NOT NULL PRIMARY KEY; Run the statement in Toad for Oracle, and the outputTable alteredshown in Figure 1 indicates that the new column was added. Figure 1. Table altered to add a new column
Table Partitioning Now a days enterprises run databases of hundred of Gigabytes in size. These databases are known as Very Large Databases (VLDB). From Oracle Ver. 8.0 Oracle has provided the feature of table partitioning i.e. you can partition a table according to some criteria . For example...