The article will then demonstrate the steps to connect to an Oracle database using DbVisualizer, create table structures with different data types and insert data. The objective of this article is to help readers comprehend the importance of data types in an Oracle database and how to use DbVisualizer to manage them effectively.

A data type is a category that defines the type of values that a column can hold. In a database, a data type is a specification that determines the type of data that can be stored in a column of a table. This ensures that only the appropriate data type can be stored in the column.

Data types are critical in any database management system as they ensure the accuracy of the data stored in the database and efficiency working with that data. Specifying the type of data that can be stored in a column helps prevent errors, save space, and improve performance. Properly choosing a data type makes it easier to understand and manage the data in our database instance.

Choosing the right data type involves considering factors such as the type of data, size of the data, performance requirements, portability needs, and potential future use of the data. By considering these factors, you can select a data type that best represents the type of data, helps optimize storage and retrieval performance, and accommodates any future requirements.

Oracle, like many relational databases, offers a wide range of datatypes to store different kinds of data. To ensure the accuracy and efficiency of your queries, it is important to have a good understanding of the different datatypes in Oracle and to select the most suitable one for each column. The datatypes offered by Oracle are as follows:

Oracle offers several numerical datatypes, including NUMBER, INTEGER, and FLOAT. NUMBER is used to store numeric values with high precision, INTEGER is used to store whole numbers, and FLOAT is used to store approximate numeric values.

Oracle has 8 character datatypes CHAR, NCHAR, VARCHAR, VARCHAR2, and NVARCHAR, CLOB, NCLOB, and LONG. CHAR and VARCHAR2 are more important. VARCHAR2 is used to store variable-length character strings, while CHAR is used to store fixed-length character strings.

Oracle provides two datatypes for date and time information: DATE and TIMESTAMP. DATE is used to store date and time information, and TIMESTAMP is used to store more precise date and time information.

Oracle has two datatypes for large objects, BLOB and CLOB. BLOB is used to store binary data, while CLOB is used to store character data.