New Functions/Improvements in PostgreSQL 9.1
1. SQL function format(text, …): This function is similar to the C function sprintf; However only the following conversion specifications are recognized: %s interpolates the corresponding argument as a string %I escapes its argument as an SQL identifier %L escapes its argument as an SQL literal %% outputs a literal %. A conversion can reference an explicit parameter position by preceding the conversion specifier with n$, where n is the argument position Some Examples are given below: postgres=# select format('%1$s %3$s', 1, 2, 3); format -------- 1 3 (1 row) postgres=# select format('Hello %s', 'World'); format ------------- Hello World (1 row) postgres=# select format('Hello %s %1$s %s', 'World', 'Hello again'); format ------------------------------- Hello World World Hello again (1 row) 2. New string functions concat(), concat_ws(), left(), right(), and reverse() (i). concat() function:...