Скачать или смотреть SQL Day 40/100 : Substring function in SQL

SQL Day 40/100: SQL `SUBSTRING()` Function in 60 Seconds!

Want to extract a part of a string in SQL? The `SUBSTRING()` function is your go-to tool! Whether you need to grab a specific portion of data from a column or clean up messy text, this function can save you tons of time and effort.

👨‍💻 How does it work?
In SQL, the `SUBSTRING()` function allows you to extract a part of a string by specifying the starting position and length.

📌 Syntax:
```sql
SUBSTRING(string, start_position, length)
```

✨ Real-life examples:
Extracting domain from emails
Extracting area codes from phone numbers
Isolating first names from full names
Parsing date or time stamps

🎬 Watch the video for a demo and to learn how to use it in your queries!


Most Asked Q&A about the `SUBSTRING()` Function:

1. Q: What is the basic syntax of `SUBSTRING()` in SQL?
A:
The basic syntax is:
```sql
SUBSTRING(string, start_position, length)
```
`string`: The text string from which to extract a substring.
`start_position`: The position where the extraction starts (1-based index).
`length`: The number of characters to extract.

2. Q: What happens if the `start_position` is greater than the length of the string?
A:
SQL will return an empty string (`''`) if the starting position is greater than the length of the string.

3. Q: Can I use `SUBSTRING()` to extract from the end of a string?
A:
Yes, many SQL databases support negative indices for the `start_position`. For example, `SUBSTRING('Hello', -3, 2)` would return `'ll'`.

4. Q: Does `SUBSTRING()` work with non-text data types?
A:
The function works with text-based data types, like `VARCHAR`, `TEXT`, and `CHAR`. Non-text data types should be converted to strings first (e.g., using `CAST()` or `CONVERT()`).

5. Q: Can I extract multiple substrings in one query?
A:
Yes, you can call `SUBSTRING()` multiple times in a query to extract different parts of a string or use it in combination with other string functions like `CONCAT()`.


#SQL #SQLTips #SQLTutorial #SQLFunction #SUBSTRING #Database #SQLQueries #Coding #LearnSQL #TechTips #SQLProgramming #SQLForBeginners #SQLTricks #SQLHelp #DataScience #DataAnalytics #TechReels

SQL Substring function
How to use SUBSTRING in SQL
SQL string manipulation
SQL query tutorial
Extracting substring in SQL
SQL text functions
String functions in SQL
SQL substring examples
SUBSTRING SQL example
SQL query string operations
SQL substring tutorial
SQL coding tips
Learn SQL online
SQL for beginners
Advanced SQL techniques