title: How to determine if a character is uppercase or lowercase in postgresql?
body: <p>I have failed to find any function like <code>isupper</code> or <code>islower</code> in postgresql.
  What I actually need is to select all the records from a table, where one of the columns contains capitized (but not uppercase) words. That is, the first symbol of each word is uppercase, and the second is lowercase. Words can be written in any language. </p>