PostgreSQL offers a number of specific datatypes. [0..infinity]. @danmcclain originally wrote it in Ruby and the performance was OK at best. We've been using it in production for a long time now, and have pretty much covered our usage of Postgres - we've written nearly 600 migrations with it. Consider the table Book shown below: We need the name of the column author to book_author. :text, :binary and :integer columns. name, at least in Rails 2.3. Though we only actually hold the ACCESS EXCLUSIVE lock for a fraction of a second, we make the table completely unavailable for the length of time we have to wait for that lock as well. However, every developer knows altering a large database without any downtime can get pretty tricky. It took an hour and a half. However, every developer knows altering a large database without any … PostgreSQL array type support. The table has two columns, id, and name. :scale - Specifies the scale for the :decimal and If you have any comments, ideas or feedback, feel free to contact us at eval(decodeURIComponent('%64%6f%63%75%6d%65%6e%74%2e%77%72%69%74%65%28%27%3c%61%20%68%72%65%66%3d%5c%22%6d%61%69%6c%74%6f%3a%74%65%61%6d%40%61%70%69%64%6f%63%6b%2e%63%6f%6d%5c%22%3e%74%65%61%6d%40%61%70%69%64%6f%63%6b%2e%63%6f%6d%3c%5c%2f%61%3e%27%29%3b')). GoCardless SAS (23-25 Avenue Mac-Mahon, Paris, 75017, France), an affiliate of GoCardless Ltd (company registration number 834 422 180, R.C.S. 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