Merging Multiple Tables Into a Single Table With SQL

I don't consider myself a database admin guru, so when my goal has an underlying task which involves database work, I usually google fu the task. The search results bring me to some StackOverflow thread that has the solution. Recently, I was confronted with an interesting task to which my google fu did not help me.

The task was to merge many database tables into a single table. I was not able to find an example on the internet so I was on my own. After much trial and error I managed to script a and SQL query to merge all the database tables into a single table.

Without further a do, here is the SQL that I used to for the task :

DO  
$$
DECLARE  
    rec record;
BEGIN  
    FOR rec IN
        SELECT table_schema, table_name
        FROM information_schema.columns
    LOOP
        EXECUTE format('INSERT INTO merged (SELECT * FROM %I.%I);',
            rec.table_schema, rec.table_name);
    END LOOP;
END;  
$$

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