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Try this,

CONSTRAINT fk_tbl FOREIGN KEY (FIELD_1,FIELD_2) REFERENCES regioni(FIELD_1,FIELD_2) 

Out of the scope of the question but may give some informations why naming constraint is important

Try this,

CONSTRAINT fk_tbl FOREIGN KEY (FIELD_1,FIELD_2) REFERENCES regioni(FIELD_1,FIELD_2) 

Out of the scope of the question but may give some informations why naming constraint is important

Try this,

CONSTRAINT fk_tbl FOREIGN KEY (FIELD_1,FIELD_2) REFERENCES regioni(FIELD_1,FIELD_2) 

Out of the scope of the question but may give some informations why naming constraint is important

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John Woo
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Try this,

CONSTRAINT fk_tbl FOREIGN KEY (FIELD_1,FIELD_2) REFERENCES regioni(FIELD_1,FIELD_2) 

Out of the scope of the question but may give some informations why naming constraint is important