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CREATE TABLE copy LIKE original;
ALTER TABLE copy DISABLE KEYS;
SET unique_checks=0; SET foreign_key_checks=0;
INSERT INTO copy SELECT * FROM original;
ALTER TABLE copy ENABLE KEYS;
SET unique_checks=1; SET foreign_key_checks=1;
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UPDATE table_name SET field1 = new-value1, field2 = new-value2
[WHERE Clause]