How to coalesce two column with default value 0 in postgresql?

@larissa 

To coalesce two columns with a default value of 0 in PostgreSQL, you can use the COALESCE function along with the literal value 0 as the default.

Here is an example query:

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SELECT COALESCE(column1, 0) + COALESCE(column2, 0) AS total
FROM your_table;

In this query, the COALESCE function is used to return the first non-null value from the specified columns. If both column1 and column2 are NULL, the COALESCE function will return 0 as the default value. Then, the query calculates the sum of the two columns with the default value of 0.

You can adjust this query based on your specific requirements and column names in your table.