What Is Charindex In Sql

SQL Programming

Hello there! Let’s dive into the fascinating world of SQL and explore the concept of CHARINDEX.

When working with SQL, you might encounter scenarios where you need to find the position of a specific substring within a string. This is where the CHARINDEX function comes into play. It is a powerful tool that allows you to locate the position of a specified substring within a string.

Imagine this scenario: you have a database table with a column containing text values, and you need to find out the position of a particular word or phrase within those values. This is where CHARINDEX proves to be incredibly useful.

The basic syntax of the CHARINDEX function in SQL is:

CHARINDEX(substring, string, start_location)

The substring parameter represents the specific sequence of characters you want to find within the string. The string parameter refers to the input string in which you want to search for the substring. Lastly, the optional start_location parameter allows you to specify the position within the string at which the search should begin.

For example, if I wanted to find the position of the substring “apple” within the string “I like apples and oranges”, I would use the CHARINDEX function like this:

SELECT CHARINDEX('apple', 'I like apples and oranges');

Upon executing this query, the result would be the position of the substring “apple” within the original string, which in this case would be 7.

With CHARINDEX, you have the flexibility to manipulate the search process and retrieve the desired information effectively.

It’s important to note that CHARINDEX is case-insensitive, meaning that it will find the first occurrence of the substring without considering the case of the letters in the string.

Another point to remember is that if the substring is not found within the string, the CHARINDEX function will return 0.

Now that we’ve explored the functionality and syntax of CHARINDEX, it’s time to put this knowledge into practice and leverage its power in our SQL queries.

Personal Reflection

As a SQL enthusiast, I find the CHARINDEX function to be incredibly handy in my day-to-day work. It has saved me countless hours when I needed to perform complex searches within textual data. The ability to specify the starting position for the search has been particularly useful in refining the results. I encourage you to experiment with CHARINDEX in your own SQL projects, and I’m confident that you’ll appreciate its utility as much as I do.


In conclusion, CHARINDEX is a valuable asset in the toolkit of any SQL developer or data professional. Its ability to locate the position of a specified substring within a string, coupled with its flexibility and ease of use, makes it a must-have function for working with textual data in SQL.