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CREATE TABLE t1 (col1 enum('red','blue','green'));
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INSERT INTO t1 VALUES ('red'),('blue'),('green');
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INSERT INTO t1 (col1) VALUES ('yellow');
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INSERT INTO t1 (col1) VALUES ('redd');
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INSERT INTO t1 VALUES ('');
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UPDATE t1 SET col1 ='yellow' WHERE col1 ='green';
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INSERT IGNORE INTO t1 VALUES ('yellow');
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UPDATE IGNORE t1 SET col1 ='yellow' WHERE col1 ='blue';