How to create a sequence in a specific format in postgresql?

Question

I want to automatically generate an unique entity field in Postgresql in following format:

"ССDDD" where "C" is a character and "D" is a digit.

For example "FG1752" or "HK9273". How can this be implemented?

Why do you want to do this? Is it just to produce a non obvious numeric identifier? If so you could use something like hashids to accomplish this more easily — Jesse Carter
– Jesse Carter, Commented May 25, 2021 at 18:47

eshirvana · Accepted Answer · 2021-05-25 18:09:32Z

1

here is one way in mysql :

SELECT concat(char(floor(rand() *(90-65+1)+65)), 
       char(floor(rand() *(90-65+1)+65)), 
       lpad(floor(rand() *(10000)),4,0) 
) RandomAlphanumeric

in postgresql:

SELECT concat(chr(floor(random() *(90-65+1)+65)::int), 
       chr(floor(random() *(90-65+1)+65)::int), 
       lpad(floor(random() *(10000))::varchar(4),4,'0') 
) RandomAlphanumeric

I'm producing a random number between 65 and 90 which are ascii code for A to Z

edited May 25, 2021 at 18:09

answered May 25, 2021 at 17:26

eshirvana

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