The tawny owl or brown owl (Strix aluco) is a stocky, medium-sized owl commonly found in woodlands across much of Eurasia. Its underparts are pale with dark streaks, and the upperparts are either brown or grey. Several of the eleven recognised subspecies have both variants.
At the most basic level, a function definition (i.e., the code that defines the function) requires the function keyword, the function's name, and a script block, as the following syntax shows: The script block, which needs to be enclosed in braces, contains the statements that run when you call the function.
SQL defines some string functions that use key words, rather than commas, to separate arguments. Details are in Table 9-6. PostgreSQL also provides versions of these functions that use the regular function invocation syntax (see Table 9-7). Note: Before PostgreSQL 8.3, these functions would silently accept values of several non-string data types as well, due to the presence of implicit coercions from those data types to text. Those coercions have been removed because they frequently caused surprising behaviors.