How to use double in mysql

DOUBLE is a floating-point number type in MySQL, used to store approximate values, with a precision of 15-16 significant digits, ranging from -1.7977e 308 to 1.7977e 308. It is mainly used to store monetary values ​​and scientific calculations. and statistics.

DOUBLE data type in MySQL

What is the DOUBLE data type?

DOUBLE is a floating-point number data type in MySQL, used to store approximate values ​​with decimal parts.

Features:

• Storage 8 bytes (64 bits) of data
• Precision: 15-16 significant digits (after the decimal point)
• Range: approximately -1.7977e 308 to 1.7977e 308

Purpose:

DOUBLE data type is mainly used for storage:

• Currency values
• Scientific calculations
• Statistics
• Any data that requires decimal precision

How Use DOUBLE data type?

When creating a table in MySQL, you can specify the DOUBLE data type using the following syntax:

<code>CREATE TABLE table_name (
  column_name DOUBLE
);</code>

Advantages:

• Than Other floating point types, such as FLOAT, have higher precision.
• Can store very large values ​​​​and very small values ​​​​(scientific notation).

Disadvantages:

• The storage space is larger than the integer type, which may affect performance.
• The accuracy is limited and may not be suitable for calculations that require absolute accuracy.

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