Question

I need to insert some field in a table. The table:

    CREATE TABLE RADAR(
    ctfoto  VARCHAR2(5),
    pkradar NUMBER(3,0),
    sradar  VARCHAR2(3),
    limitvelctera   NUMBER(3,0),
    limitvelradar NUMBER(3,0),  
    CONSTRAINT radar_pk PRIMARY KEY(ctfoto, pkradar, sradar)
);

The insert operation:

INSERT INTO RADAR(ctfoto, pkradar, sradar, limitvelctera, limitvelradar)
SELECT distinct carretera_foto, pto_km_radar, sentido_radar, limit_vel_ctera, limit_vel_radar FROM gotcha 

The error:

ORA-00001: unique constraint (USER4704.RADAR_PK) violated

Please help.

Answer 1

DISTINCT applies to the entire set of columns you are selecting.

In all probability, you have rows in GOTCHA that have the same carretera_foto, pto_km_radar, and sentido_radar values but different values for one or both of the other two columns (limit_vel_ctera and limit_vel_radar). The DISTINCT in your SELECT cannot eliminate either of the rows because at least one value is different but the primary key constraint on the RADAR table rejects rows where the first three columns are identical.