# How decimal data type works in SQL?

Contents

## What is DECIMAL data type in SQL?

Overview of SQL Server DECIMAL Data Type

To store numbers that have fixed precision and scale, you use the DECIMAL data type. … The precision has a range from 1 to 38. The default precision is 38. s is the scale which is the number of decimal digits that will be stored to the right of the decimal point.

## How do you write DECIMAL data type in SQL?

The Basic syntax of Decimal data type in SQL Server

1. p stands for Precision, the total number of digits in the value, i.e. on both sides of the decimal point.
2. s stands for Scale, number of digits after the decimal point.

## Is decimal a valid data type in SQL?

The DECIMAL data type accepts numeric values, for which you may define a precision and a scale in the data type declaration. The precision is a positive integer that indicates the number of digits that the number will contain. … The scale for a DECIMAL cannot be larger than the precision.

## What is a decimal data type?

The decimal data type is an exact numeric data type defined by its precision (total number of digits) and scale (number of digits to the right of the decimal point). For example: … The scale of a decimal value cannot exceed its precision. Scale can be 0 (no digits to the right of the decimal point).

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## Is string is a data type?

A string is generally considered a data type and is often implemented as an array data structure of bytes (or words) that stores a sequence of elements, typically characters, using some character encoding.

## What is number data type in SQL?

In SQL, numbers are defined as either exact or approximate. The exact numeric data types are SMALLINT , INTEGER , BIGINT , NUMERIC(p,s) , and DECIMAL(p,s) . … The approximate numeric data types are FLOAT(p) , REAL , and DOUBLE PRECISION .

## What is the difference between float and decimal?

Float stores an approximate value and decimal stores an exact value. In summary, exact values like money should use decimal, and approximate values like scientific measurements should use float. When multiplying a non integer and dividing by that same number, decimals lose precision while floats do not.

## How do you set decimal places in SQL?

Generally you can define the precision of a number in SQL by defining it with parameters. For most cases this will be NUMERIC(10,2) or Decimal(10,2) – will define a column as a Number with 10 total digits with a precision of 2 (decimal places). It can also be declared as DECIMAL(10, 2).

## Does varchar accept decimal?

3 Answers. The short answer is: No, it will hurt performance. The longer answer: VARCHAR fields are variable length, meaning, that the formatting of the database blocks cannot pre-account for the size of the data filling in there.

## How do I compare two decimal values in SQL?

Hence, this is equivalent to: declare @num1 decimal(18, 0) = 1.98; declare @num2 decimal(18, 0) = 2.2; SQL Server then assigns the values by converting the constants to the appropriate value, and both are being set to “2.”. You need to explicitly set the precision/scale if you want those values to be stored exactly.

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