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create table dbname ( col1 integer, col2 integer, col3 integer, col4 integer ); create unique index col1_uniq on dbname (col1); -- success INSERT INTO dbname(col1, col2, col3, col4) VALUES (1, 2, 3, 4); -- fail INSERT INTO dbname(col1, col2, col3, col4) VALUES (1, 2, 3, 4);
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