HASH

Apply a hashing algorithm to a character string and return a hexadecimal string.

HASH(string [, algorithm ])
string
Specify a character string that is the input to the function.
algorithm
Optionally, specify one of the following algorithms. The default is 2 (SHA-2).
Algorithm Mode Output Length (Bits) Output Type
0 MD5 128 VARCHAR(128)
1 SHA-1 160
2 SHA-2 256
3 SHA-2 512

The return type of this function is VARCHAR(128).

Examples

For example:
premdb=# select nickname, hash(nickname,2) hashname 
from team 
where htid <10 
order by nickname;
 nickname  |                             hashname                             
-----------+------------------------------------------------------------------
 Blues     | a87be8077f00caa60dc4522640674d48d898fc6ad747513b137c8754800b5532
 Cherries  | 4bb92af3df886cdd3dfb96f1341fdec9c8d1ead626fb00bfc9c0f652fe7170ea
 Gunners   | 3d2424adb81588b55e21cfd2c3edd704a57a0b97006644f6ed18dabcacd30118
 Rovers    | 8104dacaef7ff8a603b1df60dc3725f17fa822dfcdb9b54f65618c16fe728627
 Seasiders | e098d41f26ac73ac9c95589d00de0a243cac8254cbab6f8b7fe54cedbc497e70
 Trotters  | 3521b2a0a33a5bcc8fcc749c4a8ceb509a5eb0bc1959d4307cf546374cf7c5f2
 Tykes     | 42f5e399370e0f2fad34deb312a66fa5b0599cd28c382806b530ffcd5cbda58d
 Villains  | 72c005cb8fad1826419e3f98582d67386682368ad61ff11c1514df48cdff85fb
(8 rows)
premdb=# select hash('We are such stuff as dreams are made on') from sys.const;
                               hash                               
------------------------------------------------------------------
 ca8e75531ae20c229cb7b6c996c5d2d7a9906f18564f1c60679dc76dddc2d41c
(1 row)