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CREATE TABLE t1 (col1 CHAR(5), col2 VARCHAR(6));
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INSERT INTO t1 VALUES ('hello', 'hello');
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INSERT INTO t1 VALUES ('he', 'he');
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INSERT INTO t1 VALUES ('hello ', 'hello ');
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INSERT INTO t1 (col1) VALUES ('hellobob');
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INSERT INTO t1 (col2) VALUES ('hellobob');
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INSERT INTO t1 (col2) VALUES ('hello ');
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UPDATE t1 SET col1 ='hellobob' WHERE col1 ='he';