The table: CREATE TABLE DILOSIS ( DL_AEM INT NOT NULL, DL_CODE VARCHAR(6) NOT NULL, DL_YEAR INT NOT NULL, DL_GRADE FLOAT(3) NOT NULL, DL_LESTYPE INT NOT NULL, DL_SEMESTER INT NOT NULL, DL_DM INT NOT NULL, DL_COEF FLOAT(3), --Syntelestis ptyxiou DL_CAT_NORM BOOLEAN NOT NULL, --TRUE NORMAL, FALSE APALLAGI DL_TEI INT NOT NULL, DL_THERINO BOOLEAN NOT NULL ); ALTER TABLE DILOSIS ADD CONSTRAINT pk_dilosis PRIMARY KEY (DL_AEM, DL_CODE, DL_YEAR, DL_TEI, DL_SEMESTER); The table is empty and statements stored in a file are executed with psql. ===== Statements === \encoding iso_8859_7 delete from dilosis; INSERT INTO DILOSIS VALUES(1, 'ΓΕ0100', 2000, 0.00, 1, 1, 5, 5.00, true, 1, true); INSERT INTO DILOSIS VALUES(1, 'ΗΥ0100', 2000, 0.00, 1, 1, 5, 5.00, true, 1, true); The second insert fails with an error message: psql:a.sql:4: ERROR: duplicate key violates unique constraint "pk_dilosis" The second insert is identical to the first one except the DL_CODE value. 1:ΓΕ0100 (Gamma Epsilon ..) 2:ΗΥ0100 (Heta Ypsilon ..) I think what is hapening is that the two first letters are ignored and the two values are found identical since the postfix is 0100 for bouth of them. What can be done so the second instert does not fail? Anakreon -- Three words describe our society:homo homini lupus
