## SQL Server STR() Function: Everything You Need to Know

As businesses around the world increasingly rely on data to drive decisions, database management systems such as SQL Server have become essential tools for efficiently processing and organizing vast amounts of information. SQL Server offers a range of powerful functions that simplify working with data, including the STR() function, which converts a numeric value into a character string.

In this article, we’ll provide an overview of the STR() function, its syntax, and examples of how to use it. We’ll also explore how the function can be used for conversion between numeric and character values.

## STR() Function Overview

The STR() function is a useful tool for converting a numeric value into a character (string) value. It is commonly employed in SQL Server to change numerical data types into string data types.

This function can facilitate data analysis, calculations, and display in reports. The STR() function is known for its versatility and ease of use.

It is a simple yet effective way to convert different types of numeric values, including integers, floating-point numbers, decimal values, or any valid numerical expression, into string values.

## Syntax of STR() Function

The syntax for the STR() function in SQL Server is straightforward and easy to understand. Here is an example of how the function is written:

`STR(float_expression [, length [, decimal]])`

In this syntax, “float_expression” is the numeric value to be converted into a character string.

“length” is an optional parameter that specifies the total length of the resulting string, while “decimal” is another optional parameter that specifies the number of decimal places to include in the converted value. For example, the following code converts the floating-point number 12345.67 into a character string with a total length of 12 and a decimal point with two decimal places:

`SELECT STR(12345.67, 12, 2);`

The output of this code is ‘012345.67’.

Note that the resulting string includes six characters before the decimal point and two characters after it to fulfill the specified length and decimal positions.

## STR() Function Examples

### Example 1: Creating a Six-Position Character String

Suppose we want to create a string value with six digits for a given number, where the output should display leading zeroes when the input number has less than six digits.

For instance, let’s assume the input value is the number 12345. In this case, the resulting string should be ‘012345’.

The following code demonstrates how this can be done with the STR() function:

`SELECT STR(12345,6,0);`

The output of this code is ‘012345’, which is what we expected.

### Example 2: Including Insufficient Length

Using the STR() function, you can specify the length in characters to create the output string.

However, if the specified length is less than the number of characters required to represent the input value, the output string will still be truncated. For example:

`SELECT STR(12345, 2);`

The output of the above code will be ’12’, which is only the first two digits of the input value.

If the desired length is not adequate to represent the entire input value, the resulting string will be truncated.

## Conversion with STR() Function

Sometimes, it may be necessary to convert numeric values into character strings or vice-versa. In such scenarios, the STR() function can come in handy, allowing for easy and efficient conversion between numeric and character values.

### Converting Numeric Value to Character Value

Let’s see how to convert a numeric value into its corresponding character value using the STR() function. Consider the following example:

`SELECT STR(123);`

The output of the above code will be ‘123’, which is a character value representing the input number.

This conversion is useful in situations where numeric values need to be displayed as character values.

### Using STR() Function for Conversion

You can also use the STR() function to convert a character value into its corresponding numeric value. Here is an example of how this can be done:

`SELECT CAST(STR(1234) AS INT);`

The output of the above code is 1234.

In this example, the STR() function first converts the integer 1234 into a character string, which is then converted back to an integer using the CAST function.

## Conclusion

The STR() function in SQL Server is a valuable tool that simplifies converting numeric values into character strings. It is easy to use, versatile, and offers numerous benefits for data analysis, calculations, and report display.

By mastering the STR() function and understanding its syntax and examples, you can optimize your data management and reporting capabilities.

## Function Parameters in SQL Server STR() Function: Explained

The STR() function in SQL Server is a powerful tool that helps convert numeric values to character strings.

The function syntax consists of one mandatory parameter and two optional parameters. In this article, we’ll take a closer look at the three parameters that make up the STR() function in SQL Server and the role they play in the conversion process.

### Float_Expression Parameter

The first parameter in the STR() function syntax is “float_expression.” This parameter is mandatory and is used to specify the numeric value that needs to be converted to a character string. The float_expression parameter can accept any valid numeric expression, including integer, decimal, floating-point numbers.

The float_expression parameter is highly flexible and can include a decimal point, negative sign, or scientific notation. However, note that if the value passed as float_expression does not contain a decimal point, the resulting string’s decimal place will be absent.

Let’s look at an example:

`SELECT STR(123.45);`

Output: ‘123.45’

### Length Parameter

The second parameter in the STR() function syntax is “length.” This is an optional parameter that determines the length of the resulting string. The length parameter can be used to ensure that the resulting string has a specified number of spaces, regardless of the input values.

The length parameter accepts integer values between 1 and 8000 and is responsible for returning a fixed amount of characters in the resulting string. The length parameter also comprises the decimal point and sign, depending on the situation.

Let’s look at an example of using the length parameter:

`SELECT STR(123.45, 8);`

Output: ‘ 123.45’

Note that the resulting string is padded with spaces because the length parameter specified eight positions for the resulting string. The decimal point and sign are also included in the result, which means that the length parameter determines the number of characters in the returned string.

### Decimal Parameter

The third and final parameter in the STR() function syntax is “decimal.” This parameter specifies the number of decimal places in the resulting string. This parameter is also optional, and if not specified, the resulting string will have the same decimal places as the float_expression value.

The decimal parameter accepts integer values between 0 and 16. When the decimal parameter is explicitly declared, any decimal places in the float_expression value that exceed the specified decimal parameter are truncated.

Let’s look at an example of using the decimal parameter:

`SELECT STR(123.456, 8, 2);`

Output: ‘123.46’

Note that the decimal parameter specified two decimal places, and so the resulting string has only two decimal places. Any other decimal value after the second decimal place is truncated.

## Examples of STR() Function in SQL Server

### Example 1: Converting a Six-Digit and Decimal Value to a Six-Position Character String

Suppose we have a value that is a six-digit number with decimal points, and we need to convert it into a six-position character string with two decimal places.

In such a scenario, we can make use of the STR() function by specifying the length and two decimal places parameters. `SELECT STR(12345.67,6,2);`

Output: ‘012345.67’

Note that the six-position character string is padded with leading zeroes and includes two decimal places.

This example demonstrates how leveraging STR() function parameters can help convert a value into a specific format.

### Example 2: Dealing with Insufficient Length

Sometimes, the specified length in the STR() function might not be adequate to represent the entire input value.

In such situations, the resulting string might not contain all of the information in the input value. Suppose we need a two-character string to represent a three-digit value.

We can use the STR() function to convert the value. However, since the specified length is only two characters, the resulting string will truncate the input value.

`SELECT STR(123);`

Output: ‘**’

Note that the resulting string contains two asterisks instead of the full input value. This happens because the length parameter specified a length of two characters, which was insufficient to represent the three-digit input value.

## Conclusion

The STR() function in SQL Server is an essential tool for converting numeric values to character strings. By using its parameters – the float_expression, length, and decimal – you can format the resulting string to better suit your needs.

Leveraging the STR() function’s flexibility ensures that you can perform a wide array of conversion operations, reducing the need for specialized procedures to convert between numeric and string data.

## A Comprehensive Guide to SQL Server STR() Function: Summary

SQL Server STR() function is a useful tool that simplifies converting numeric values into character strings.

By using its three parameters – float_expression, length, decimal – we can format the resulting string to meet specific requirements.

The float_expression parameter is the mandatory parameter in the STR() function syntax, and it specifies the numeric value that needs conversion.

The length parameter is optional and helps determine the length of the resulting string. Finally, the decimal parameter is also optional, and it specifies the number of decimal places in the output string.

We have examined many examples in this article to illustrate how these parameters work together and help ensure that the resulting string meets specific requirements. Using the STR() function’s flexibility in conjunction with the parameters makes it easier to perform conversion operations, and the function reduces the requirement to use specialized programming procedures to convert between character and numeric data.

SQL Server is a database management system used in many businesses to provide efficient data processing and organization. In most applications, SQL server provides several functions that make it easier to manage and manipulate data sets.

SQL Server STR() function is one of these functions. The STR() function receives a numeric value and converts it into a character string.

This can be useful in many instances, such as displaying numeric values with specific formatting styles. Besides, the STR() function could be used for rounding to a specific decimal place, making calculations with floating-point values, and more.

In conclusion, the SQL Server STR() function is one of several functions in SQL Server that provides powerful capabilities when handling data. It is worth the effort to become proficient in the STR() function’s use and its parameters to take advantage of its flexibility when working with numeric values.

In summary, the SQL Server STR() function is a valuable tool for converting numeric values into character strings. With its three parameters – float_expression, length, and decimal – users can format the resulting string according to specific requirements.

The STR() function can be used for different operations, such as converting integers, decimal values, and floating-point numbers into strings. Mastering the STR() function and its parameters can help one become more proficient in data processing, organization, and analysis.

The function’s flexibility and ease of use make it an essential tool for any SQL Server user.