Usage of decimal in sql

The DECIMAL data type in SQL is used to store exact decimal numbers. It has the following syntax: DECIMAL(precision, scale), where precision is the total number of digits and scale is the number of digits after the decimal point. DECIMAL is used to store financial data, monetary values, and other numbers that require high precision. Unlike FLOAT and DOUBLE, DECIMAL stores exact values ​​without using scientific notation. It takes up more storage space than FLOAT or DOUBLE. You should use = and <> operators when comparing. If you need greater precision and range, you can use NUMER

##Usage of DECIMAL data type in SQL

The DECIMAL data type is used in SQL to store precise decimal numbers. It is similar to the NUMERIC data type in that it is used to store fixed-length and precision numbers.

Syntax

The syntax of the DECIMAL data type is as follows:

<code class="sql">DECIMAL(precision, scale)</code>

• precision: Total number of digits, including decimal point The number of digits after.
• scale: Number of digits after the decimal point.

Example

For example, to create a DECIMAL column that can store two decimal places and a total of 5 digits, you can use the following code:

<code class="sql">CREATE TABLE my_table (
  price DECIMAL(5, 2)
);</code>

Usage

The DECIMAL data type is mainly used to store financial data, monetary values ​​and other numbers that require high precision. It's great for storing numbers that require precise calculations and comparisons.

Differences from FLOAT and DOUBLE

DECIMAL is different from the FLOAT and DOUBLE data types, which are used to store approximate values. DECIMAL stores exact decimal numbers, while FLOAT and DOUBLE use scientific notation to store approximate values. FLOAT and DOUBLE are often used to store scientific data or other numbers that don't require high precision.

Note

The DECIMAL data type takes up more storage space than FLOAT or DOUBLE.
• When comparing DECIMAL values, use the
• = and <> operators instead of >= and <= operator.
If you need to store a large number of numbers, you can use the NUMERIC data type, which provides greater precision and range than DECIMAL.

The above is the detailed content of Usage of decimal in sql. For more information, please follow other related articles on the PHP Chinese website!