inserting 1 million random data into PostgreSQL [duplicate]

Question

the table structure is like this:

milliontable(
   name varchar(10),
   age integer,
   joindate date
)

and I want to insert random 1 million data into that table. Is there any way to do that?

Answer 1

Use the random() function to generate random values:

INSERT INTO milliontable (name, age, joindate)
SELECT substr(md5(random()::text), 1, 10),
       (random() * 70 + 10)::integer,
       DATE '2018-01-01' + (random() * 700)::integer
FROM generate_series(1, 1000000);

It is usually a silly idea to store the age of a person in a table, as this number becomes wrong automatically as time goes by. Use the birthday.