CREATE TABLE t1 ( 
	id NUMBER, 
	col varchar2(15), 
	CONSTRAINT t1_pk PRIMARY KEY (id) 
)

INSERT INTO t1 VALUES (1, 'jose')

INSERT INTO t1 VALUES (2, 'Jose')

INSERT INTO t1 VALUES (3, 'JOSE')

INSERT INTO t1 VALUES (4, 'José')

INSERT INTO t1 VALUES (5, 'JOSÉ')

COMMIT

CREATE INDEX idx_t1_col_ci ON t1(NLSSORT(col, 'NLS_SORT = BINARY_AI'))

alter session set NLS_COMP='LINGUISTIC' ;

select * from NLS_SESSION_PARAMETERS where parameter in ('NLS_COMP','NLS_SORT') 

select col from t1 where col LIKE '%jose%'