Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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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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