WHERE IN condition not accepting String value

Question

I am dynamically constructing a string with name user_data in PL/Sql procedure by appending USERNAMEs, single quotes(\') and commas(,) of the form

Answer 1

Your select statement

SELECT * FROM table_name WHERE USERNAME IN (user_data)

will be treated as

SELECT * FROM table_name WHERE USERNAME = 'abc123','xyz456','pqr789'

which is not correct.

One alternative is

SELECT * FROM table_name WHERE INSTR(user_data, USERNAME) > 0