How to Get File Extension From Filename In Postgresql?

To get the file extension from a filename in PostgreSQL, you can use the split_part function. This function allows you to split a string based on a specified delimiter and then retrieve a specific part based on its position. For example, if you have a filename "example.docx", you can use the following query to extract the file extension:

1

SELECT split_part('example.docx', '.', 2) AS file_extension;

In this query, the split_part function is used to split the filename "example.docx" based on the delimiter ".", and then retrieve the second part, which represents the file extension. The result of this query would be "docx".

Best Managed PostgreSQL Hosting Providers of November 2024

1

Rating is 5 out of 5

DigitalOcean

Try It Now

2

Rating is 4.9 out of 5

AWS

Try It Now

3

Rating is 4.8 out of 5

Vultr

Try It Now

4

Rating is 4.7 out of 5

Cloudways

Try It Now

What is the procedure to extract file extension from filename in PostgreSQL?

In PostgreSQL, you can extract the file extension from a filename using the following query:

1. Using substring and position functions:

1
2
3
4
5

SELECT CASE 
    WHEN POSITION('.' IN filename) = 0 THEN ''
    ELSE SUBSTRING(filename, POSITION('.' IN filename) + 1)
END AS file_extension
FROM your_table;

1. Using substring and split_part functions:

1
2

SELECT SPLIT_PART(filename, '.', 2) AS file_extension
FROM your_table;

Replace 'filename' with the column containing the file names in your table and 'your_table' with the name of your table. The above queries will extract the file extension from the filenames in the specified column.

How to store file extension from filename in PostgreSQL?

To store the file extension from a filename in PostgreSQL, you can create a new column in your table to store the file extension. You can use the substring function in PostgreSQL to extract the file extension from the filename and store it in the new column.

Here's an example of how you can do this:

1. Assuming you have a table named files with a column filename that stores the filenames.
2. To add a new column named file_extension to store the file extension, you can use the following SQL query:

1

ALTER TABLE files ADD COLUMN file_extension TEXT;

1. Then, you can update the file_extension column with the file extension by using the substring function:

1

UPDATE files SET file_extension = substring(filename from '\.([^\.]+)$');

This query will extract the file extension from the filename column and store it in the file_extension column.

1. Finally, you can query the table to retrieve the filenames along with the file extensions:

1

SELECT filename, file_extension FROM files;

This will display the filenames along with their corresponding file extensions.

By following these steps, you can easily store the file extension from the filename in PostgreSQL.

How to extract file extension from filename in PostgreSQL?

You can extract the file extension from a filename in PostgreSQL using the following SQL query:

1
2
3

SELECT 
    SUBSTRING(filename FROM (LENGTH(filename) - POSITION('.' IN REVERSE(filename)) + 2)) AS file_extension
FROM your_table_name;

In this query, filename is the column in your table that contains the filenames. Replace your_table_name with the actual name of your table.

The SUBSTRING function is used to extract a substring from the filename starting from the position of the last occurrence of the '.' character (which indicates the start of the file extension) to the end of the filename.

This query will return the file extension of each filename in the specified column.

How to parse file extension from filename in PostgreSQL?

You can parse the file extension from a filename in PostgreSQL using the substring function along with the position and length functions. Here's an example query that demonstrates how to do this:

1
2
3
4
5
6
7
8

WITH files AS (
    SELECT 'example.txt' AS filename
)

SELECT 
    filename,
    substring(filename from position('.' in filename) + 1) as file_extension
FROM files;

In this query:

• The substring function is used to extract the file extension from the filename.
• The position function is used to find the position of the dot that separates the filename and the file extension.
• The substring function then extracts the file extension by starting from the position of the dot + 1 (to exclude the dot itself).
• The output will be the original filename along with its corresponding file extension.

You can replace 'example.txt' with the column containing the filenames in your table.