Using the “IN” clause with a comma delimited string from the output of a replace() function in Oracle SQL

Question

I have an comma delimited string which I want to use in an \"IN\" clause of the statement. eg: 100,101,102

Since In and \"IN\" clause I have to quote the individial

Answer 1

As the comma-separated values contain only digits, why not try something as simple as using:

INSTR(','||my_csv_list_of_values||',', ','||my_search_value||',') <> 0

See this example:

-- some test data
with employee as (
  select 101 as employee_number from dual
  union select 200 from dual
  union select 10 from dual
  union select 102 from dual)

-- the actual query
select * from employee
  where INSTR(','||'101,102,103,104'||',', ','||employee_number||',') <> 0;
--                 ^^^^^^^^^^^^^^^^^
--                   your CSV data

Producing:

EMPLOYEE_NUMBER
101
102