MySQL · December 20, 2023

MySQL Command: REAL

MySQL Command: REAL

MySQL is a popular open-source relational database management system (RDBMS) that is widely used for web applications and other data-driven projects. It provides a comprehensive set of commands and functions to manipulate and query data stored in databases. One such command is the REAL command, which is used to define a column with a floating-point data type in a MySQL table.

Overview of the REAL Data Type

The REAL data type in MySQL is used to store single-precision floating-point numbers. It is a 4-byte data type that can represent a wide range of values, including both positive and negative numbers, as well as zero. The REAL data type is commonly used to store values that require decimal precision but do not require the full precision provided by the DOUBLE data type.

When defining a column with the REAL data type, you can specify the precision and scale of the column. The precision represents the total number of digits that can be stored in the column, while the scale represents the number of digits that can be stored after the decimal point. For example, a column defined as REAL(8,2) can store up to 8 digits, with 2 digits after the decimal point.

Using the REAL Command in MySQL

To create a table with a column of the REAL data type, you can use the CREATE TABLE statement in MySQL. Here's an example:

CREATE TABLE products (
    id INT PRIMARY KEY,
    name VARCHAR(50),
    price REAL(8,2)
);

In this example, the "products" table is created with three columns: "id" of type INT, "name" of type VARCHAR, and "price" of type REAL with a precision of 8 and a scale of 2. The "price" column can store up to 8 digits, with 2 digits after the decimal point.

Once the table is created, you can insert data into it using the INSERT INTO statement. Here's an example:

INSERT INTO products (id, name, price)
VALUES (1, 'Product A', 9.99);

In this example, a row is inserted into the "products" table with an "id" of 1, a "name" of "Product A", and a "price" of 9.99.

Querying Data with REAL Columns

When querying data from a table with a REAL column, you can use the SELECT statement in MySQL. Here's an example:

SELECT id, name, price
FROM products
WHERE price > 5.00;

In this example, the SELECT statement retrieves the "id", "name", and "price" columns from the "products" table. The WHERE clause filters the results to only include rows where the "price" is greater than 5.00.

Summary

The REAL command in MySQL is used to define a column with a floating-point data type in a table. It is commonly used to store single-precision floating-point numbers that require decimal precision but do not require the full precision provided by the DOUBLE data type. By understanding how to use the REAL command, you can effectively define and manipulate floating-point data in your MySQL databases.

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