create_big_db.sql

;; create 100 tables, each with 100 columns of type: timestamp, int, float, text
;; each table has 100 rows

DO
$$
DECLARE
    table_idx INT;
    column_idx INT;
    col_type_idx INT;
    col_types TEXT[] := ARRAY['INT', 'TIMESTAMP', 'FLOAT', 'TEXT'];
    col_type TEXT;
    insert_stmt TEXT;
BEGIN
    FOR table_idx IN 1..100 LOOP
        EXECUTE format('CREATE TABLE table_%s (', table_idx) ||
            array_to_string(ARRAY(
                SELECT format('col_%s_%s %s', table_idx, col_idx, col_types[(col_idx % 4) + 1])
                FROM generate_series(1, 100) AS col_idx
            ), ', ') ||
            ');';
        insert_stmt := '';
        FOR column_idx IN 1..100 LOOP
            col_type_idx := (column_idx % 4) + 1;
            col_type := col_types[col_type_idx];
            IF col_type = 'INT' THEN
                insert_stmt := insert_stmt || format('%s', floor(random())::int) || ', ';
            ELSIF col_type = 'TIMESTAMP' THEN
                insert_stmt := insert_stmt || 'current_timestamp, ';
            ELSIF col_type = 'FLOAT' THEN
                insert_stmt := insert_stmt || 'random(), ';
            ELSE
                insert_stmt := insert_stmt || format('''sample_text_%s''', column_idx) || ', ';
            END IF;
        END LOOP;
        insert_stmt := left(insert_stmt, -2);  -- Remove last comma and space
        FOR row_idx IN 1..100 LOOP
            EXECUTE format('INSERT INTO table_%s VALUES (%s);', table_idx, insert_stmt);
        END LOOP;
    END LOOP;
END
$$;