Conditional unique constraint with multiple fields in oracle db

Question

I have this table:

XPTO_TABLE (id, obj_x, date_x, type_x, status_x)

I wanna create a unique constraint that applies to the fields (ob

Answer 1

Because the CREATE UNIQUE INDEX is expecting only a value you can concatenate the columns as follow

CREATE UNIQUE INDEX UN_OBJ_DT_TYPE_STATUS
ON XPTO_TABLE(
(CASE
     WHEN STATUS_X <> 5
         THEN OBJ_X || TO_CHAR (DATE_X, 'dd/MM/yyyy') || TYPE_X
     ELSE
         NULL
 END));