sql character index
-- EXAMPLE
select
'0004V0' as TESTER_STRING
, CHARINDEX('V','0004V0') -- OUTPUT: 5
, CHARINDEX('0','0004V0') -- OUTPUT: 1
, CHARINDEX('0','0004V0',4) -- OUTPUT: 6
from DUAL;
-- SYNTAX
CHARINDEX(/*substring*/, /*Main string*/, /*start index*/)