ex)
UPDATE `joke` SET `jokedate` = "2020-06-01" WHERE id="1";
UPDATE `테이블명` SET `컬럼` = "바꿀내용" WHERE id="1";
ex)
UPDATE `joke` SET `jokedate` = "2020-06-30" WHERE `joketext` LIKE "%참%";
UPDATE `테이블명` SET `컬럼1` = "2020-06-30" WHERE `컬럼2` LIKE "%참%";
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