What Are the Data Types in PL SQL?
When working with PL SQL, it is important to understand the various data types that are available. Data types determine the type of data that can be stored in a variable or column and define how that data can be manipulated.
The number data type is used to store numeric values.
It can be used to store integers, decimals, or floating-point numbers. The precision and scale of the number can be specified, allowing for a wide range of values to be stored.
The character data type is used to store alphanumeric values such as letters, numbers, and special characters. It has a fixed length that needs to be defined during declaration.
The date data type is used to store dates and timestamps. It allows for manipulation and formatting of dates, making it easier to perform calculations or comparisons.
The boolean data type is used to store logical values – true or false. It is commonly used in conditions or expressions where a decision needs to be made based on certain criteria.
5. LOB (Large Object):
The LOB data type is used to store large amounts of unstructured data such as text documents, images, or videos. It provides efficient storage and retrieval mechanisms for handling large objects.
Other Data Types in PL SQL
In addition to the basic data types mentioned above, PL SQL also provides several other specialized data types:
- VARCHAR2 is similar to the character data type but allows for variable length strings.
- It is commonly used when the length of the string may vary.
- The RAW data type is used to store binary data such as images or files.
- It is commonly used when working with external files or handling raw binary data.
- The INTERVAL data type is used to store intervals of time or date differences.
- It allows for easy manipulation and calculation of time durations.
- The RECORD data type is used to define a custom structure that can hold multiple values of different types.
- It is similar to a struct in other programming languages and provides a way to group related data together.
In conclusion, understanding the various data types in PL SQL is essential for effective database programming. By choosing the appropriate data type for each variable or column, you can ensure efficient storage and manipulation of your data.
– Oracle PL/SQL Documentation: https://docs.oracle.com/en/database/oracle/oracle-database/19/lnpls/index.html