IsNumber SQL Server

Hello Dev, welcome to our article on IsNumber SQL Server. In this article, we will guide you through everything you need to know about IsNumber SQL Server. You will learn what IsNumber is, how to use it, and its importance in SQL Server. So, let’s get started!

What is IsNumber SQL Server?

IsNumber is a function in SQL Server that is used to check if an expression is a numeric value. It returns a value of 1 if the expression is a numeric value, otherwise it returns a value of 0. IsNumber is commonly used with the WHERE clause to filter out non-numeric values from a table. Let’s take a deeper dive into how IsNumber works.

How Does IsNumber Work?

IsNumber is a built-in function in SQL Server that takes one argument as input. The argument can be any valid SQL Server data type. IsNumber checks if the input value is a numeric value or not. If the input value is a numeric value, then IsNumber returns a value of 1, otherwise it returns a value of 0.

Here is the syntax for using IsNumber in SQL Server:

IsNumber Syntax
SELECT IsNumber (expression);

Here, expression is the input value that we want to check for numeric value.

Example

Let’s take a look at an example to see how IsNumber works:

Code
Output
SELECT IsNumber(‘123’);
1
SELECT IsNumber(‘ABC’);
0
SELECT IsNumber(‘123ABC’);
0

In the first example, IsNumber returns a value of 1 because the input value is a numeric value. In the second example, IsNumber returns a value of 0 because the input value is not a numeric value. In the third example, IsNumber returns a value of 0 because the input value is a combination of numeric and non-numeric values.

How to Use IsNumber in SQL Server?

IsNumber is commonly used with the WHERE clause to filter out non-numeric values from a table. Here is an example:

Code
Output
SELECT * FROM Table_Name WHERE IsNumber(Column_Name) = 1;
Returns all the rows from the table where the values in Column_Name are numeric.

Importance of IsNumber SQL Server

IsNumber is an important function in SQL Server because it allows us to filter out non-numeric values from a table. This is particularly useful when we are dealing with large datasets and we only want to work with numeric values. By using IsNumber, we can improve the performance of our queries and ensure that our calculations are accurate.

FAQs

Q. Can IsNumber be used with all data types?

IsNumber can be used with all SQL Server data types except for XML and text data types.

Q. Does IsNumber convert non-numeric values into numeric values?

No, IsNumber does not convert non-numeric values into numeric values. It simply checks if the input value is a numeric value or not.

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Q. What is the difference between IsNumeric and IsNumber?

IsNumeric is a function in SQL Server that is used to check if an expression is a numeric value or can be converted into a numeric value. IsNumber, on the other hand, is used to check if an expression is a numeric value only. IsNumber is faster than IsNumeric because it only checks for numeric values.

Q. Can I use IsNumber with NULL values?

Yes, IsNumber can be used with NULL values. If the input value is NULL, IsNumber will return a value of 0.

Conclusion

In conclusion, IsNumber is a useful function in SQL Server that allows us to check if an expression is a numeric value or not. By using IsNumber with the WHERE clause, we can filter out non-numeric values from a table and improve the performance of our queries. We hope this article has provided you with a clear understanding of IsNumber SQL Server. Happy coding!

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