DBAs frequently need to generate test data for a variety of reasons, whether it's for setting up a test database or just for generating a test case for a SQL performance issue.
To create a table of test data, we need the following:
The steps are as follows:
You can generate a sequence of rows using a query like the following:
postgres=# SELECT * FROM generate_series(1,5); generate_series ----------------- 1 2 3 4 5 (5 rows)
Alternatively, you can generate a list of dates, like this:
postgres=# SELECT date(generate_series(now(), ...