PostgreSQL SPLIT_PART() function

SPLIT_PART() function

The PostgreSQL SPLIT_PART() function is used to split a string into multiple parts based on a delimiter and return a specific part of the split result. It takes three arguments: the input string, the delimiter, and the position of the desired part, start from the left of the string.

Uses of SPLIT_PART() Function

• Extract Specific Substrings: Retrieve specific parts of a string by specifying a delimiter and position.


• Data Parsing: Break down complex strings into meaningful components.


• Email Processing: Extract domain names or usernames from email addresses.


• Name Splitting: Separate first names, last names, or middle names from full names.


• ID and Code Extraction: Extract specific segments from IDs or codes based on consistent delimiters.


• Log File Analysis: Parse log entries that use delimiters to separate fields.

Syntax:

split_part(<string>,<delimiter>, <field_number>)

PostgreSQL Version: 9.3

Pictorial Presentation of PostgreSQL SPLIT_PART() function

Example: PostgreSQL SPLIT_PART() function :

In the example below, the delimiter of the defined string is '-#-' and specified field number is 2. So the split_part function splits the second field from the specified string.

code:

SELECT split_part('ordno-#-orddt-#-ordamt', '-#-', 2);

Sample Output:

 split_part
------------
 orddt
(1 row)

Example:

Table : test

p_name     |p_id          |p_email                |
-----------+--------------+-----------------------+
Peter Mont |PEMO-7894-OMEP|[email protected]  |
Derak Powel|DEPO-8529-OPED|[email protected]|

If we want to extract the first part of the p_name column the following code can be used:

code:

SELECT SPLIT_PART(p_name, ' ', 1) AS first_name
FROM test;

Sample Output:

first_name|
----------+
Peter     |
Derak     |

In this example, we use a space (' ') as the delimiter to split the p_name column. The 1 as the third argument indicates that we want to retrieve the first part after splitting, which represents the first name. The result will be a list of first names extracted from the p_name column.

Example:

Table : test

p_name     |p_id          |p_email                |
-----------+--------------+-----------------------+
Peter Mont |PEMO-7894-OMEP|[email protected]  |
Derak Powel|DEPO-8529-OPED|[email protected]|

If we want to extract the middle part of the p_id column, which represents the numeric code the following code can be used:

code:

SELECT SPLIT_PART(p_id, '-', 2) AS numeric_p_id
FROM test;

Sample Output:

numeric_p_id|
------------+
7894        |
8529        |

In this example, we use a hyphen ('-') as the delimiter to split the p_id column. The 2 as the third argument indicates that we want to retrieve the second part after splitting, which corresponds to the numeric code. The result will be a list of numeric codes extracted from the product_code column.

Example:

Table : test

p_name     |p_id          |p_email                |
-----------+--------------+-----------------------+
Peter Mont |PEMO-7894-OMEP|[email protected]  |
Derak Powel|DEPO-8529-OPED|[email protected]|

If we want to extract the domain name from the p_email column the following code can be used:

code:

SELECT SPLIT_PART(p_email, '@', 2) AS domain_name
FROM test;

Sample Output:

domain_name|
-----------+
xyzmail.kom|
xyzmail.kom|

In this example, we use the at symbol ('@') as the delimiter to split the p_email column. The 2 as the third argument indicates that we want to retrieve the second part after splitting, which represents the domain name. The result will be a list of domain names extracted from the p_email column.

Previous: RTRIM function
Next: STRPOS function