GROUP_CONCAT Postgres | Guide

Learn more about GROUP_CONCAT Postgres from our experts. Our PostgreSQL Support team is here to help you with your questions and concerns.

GROUP_CONCAT Postgres | Guide

Did you know that the GROUP_CONCAT function is not available in Postgres?
Fortunately, we can achieve the same result by combining the STRING_AGG function with grouping as well as ordering clauses.

The STRING_AGG function in PostgreSQL allows us to concatenate values from a column into a single string while specifying a delimiter to separate the values. Let’s take a look at the syntax:

STRING_AGG(expression, delimiter)

To mimic the behavior of GROUP_CONCAT in MySQL, we have to combine the STRING_AGG function with the GROUP BY clause.

According to our experts, the GROUP BY clause groups the rows according to a specific column or columns. After that, we have to apply the STRING_AGG function within each group.

For example:

SELECT col1, STRING_AGG(col2, ', ') AS concatenated_values

FROM your_table

GROUP BY col1;

In the above example, col1 acts as the grouping column. On the other hand, col2 represents the column whose values we want to concatenate. The STRING_AGG function then combines the values of col2, using a comma and space as the delimiter. Finally, the result is returned as concatenated_values.

Our experts would like to point out that we can use any delimiter of our choice within the STRING_AGG function.

Furthermore, the order of the concatenated values is not guaranteed unless we specify it with the ORDER BY clause within the STRING_AGG function.

So the next time you want to achieve the functionality offered by GROUP_CONCAT in PostgreSQL, the STRING_AGG function comes in handy.

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Conclusion

In brief, our Support Techs demonstrated how to achieve the functionality offered by GROUP_CONCAT in Postgres.