How Can I Split Comma-Separated Data in a Postgres Column into Multiple Columns?

Split comma separated column data into multiple columns

In many data scenarios, data may be stored in a concatenated format and separated by delimiters such as commas. In order to extract a single value from these columns, PostgreSQL's split_part() function can be used.

Consider the following data:

<code>Column 
------- 
a,b,c,d</code>

To split this comma separated data into separate columns, you can use the split_part() function. Here’s how:

SELECT split_part(col, ',', 1) AS col1,
       split_part(col, ',', 2) AS col2,
       split_part(col, ',', 3) AS col3,
       split_part(col, ',', 4) AS col4
FROM   tbl;

This query will create four new columns (col, col1, col2, and col3) by splitting the data in the col4 column based on the comma delimiter. The output will be:

<code>Column1  Column2 Column3 Column4 
-------  ------- ------- -------
a        b       c       d</code>

The

split_part() function accepts three parameters: the column to split (col), the separator to use (,), and the position of the value to extract. In this example, we extract the first four values ​​(up to four) from the col column.

Columns that exceed the number of data items in the original column will be filled with empty strings (''). Using this technique, you can easily split comma-separated data into multiple columns for further analysis or manipulation.

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