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

Splitting Comma Separated Column Data into New Columns

In database management, it's often necessary to manipulate data in columns to fit specific requirements. One such requirement is splitting comma-separated values within a column into separate columns.

Consider the following column named "Column" containing comma-separated data:

a,b,c,d

To split these values into individual columns, the PostgreSQL function split_part() can be employed. Here's how to do it:

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;

In this query, the following steps occur:

• split_part() splits the "col" data based on the comma delimiter.
• Four new columns (col1, col2, col3, and col4) are created using split_part() with different arguments (1 to 4) to retrieve the corresponding comma-separated value.
• The query is executed against the table named "tbl."

This approach can be extended to handle columns with more or fewer comma-separated values by adjusting the number of columns created and the split_part() arguments accordingly. Any columns that exceed the available data items will be populated with empty strings ('').

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