PostgreSQL

SELECT POSITION('our' in 'w3resource');


x <> ANY (a,b,c) 
Code language: HTML, XML (xml)


is equivalent to

x <> a OR <> b OR x <> c
SELECT
	SUBSTRING ('PostgreSQL', 1, 8); -- PostgreS
SELECT
	SUBSTRING ('PostgreSQL', 8); -- SQL
Code language: SQL (Structured Query Language) (sql)
ALTER TABLE test1 ADD COLUMN id SERIAL PRIMARY KEY;

This is all you need to:

Add the id column
Populate it with a sequence from 1 to count(*).
Set it as primary key / not null.
SELECT string_to_array('xx~^~yy~^~zz', '~^~', 'yy');


select * 
from folder f
  join uploads u ON u.id = f.folderId 
where '8' = ANY (string_to_array(some_column,','))

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