Oracle

Once a table is created in the database, there are many occasions where one may wish to change the structure of the table. Typical cases include the following: …

A primary key is used to uniquely identify each row on a table. It can either be part of the actual record itself, or it can be an artificial field (something …

A foreign key is a field (or fields) that points to the primary key of another table. The purpose of the foreign key is to ensure referential integrity of the …

Sometimes we may decide that we need to get rid of a table in the database for some reason. In fact, it would be problematic if we cannot do so because this …

Sometimes we wish to get rid of all the data in a table. One way of doing this is with DROP TABLE, which we saw in the last section. But what if we wish to …

In the previous sections, we have seen how to retrieve information from tables. But how do these rows of data get into these tables in the first place? This is …

Once we have the information in the table, we might find that there is a need to modify the data. To do so, we can use the UPDATE command. The syntax for this …

Sometimes rather than updating, we wish to get rid of records from the table. To do so, we can use the DELETE FROM command. The syntax for this is DELETE FROM …

Abstract: in this instructional exercise, you will find out about the Oracle DUAL table which is a unique table utilized for assessing articulations or calling …

Summary: in this tutorial, you will learn how to use the Oracle SELECT statement to query data from a single table. In Oracle, tables are consists of columns …

The Oracle Database is an object-relational database management system created and advertised by Oracle Corporation. The Oracle Database is regularly alluded to …