In this post, I am sharing different scripts for generating a random string in PostgreSQL.

Sometimes, we need to generate a random token and any other random code in the Database System.

The PostgreSQL Provides a random() function to generate a random string with all the possible different numbers, character and symbol.
We can also use random() function with cryptography or encryption function to generate a fixed length binary string.

Generate a random string using MD5():

SELECT MD5(random()::text);

/* Result:
md5
text
-------------------------------------
5815789cc68c2c4a8a46e31c72f0a327
*/

Generate a Capital Latter random string, size of 15:

SELECT array_to_string(ARRAY(SELECT chr((65 + round(random() * 25)) :: integer) 
FROM generate_series(1,15)), '');

/* Result:
array_to_string
text
-------------------
ZPGVXSNNTWFBMDY
*/

Generate a Small Latter random string, size of 15:

SELECT array_to_string(ARRAY(SELECT chr((97 + round(random() * 25)) :: integer) 
FROM generate_series(1,15)), '');

/* Result:
array_to_string
text
-----------------
ohmqjtxxqbtqinq
*/

Generate a Numerical random string, size of 15:

SELECT array_to_string(ARRAY(SELECT chr((48 + round(random() * 9)) :: integer) 
FROM generate_series(1,15)), '');

/* Result:
array_to_string
text
-----------------
132443402808481
*/

Generate a random string with all combinations, size of 15:

SELECT array_to_string(ARRAY(SELECT chr((48 + round(random() * 59)) :: integer) 
FROM generate_series(1,15)), '');

/* Result:
array_to_string
text
-----------------
`E07
 
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