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CREATE TABLE t ( weight varchar(32), time_from varchar(32), nullable varchar(32) ); insert into t values ('100г', 'С 10 утра', 2), ('200 г', 'С 11 утра', 'ok'), ('300гр', 'С 10 утра', null), ('400 гр', 'С 11 утра', ''), ('500г.', 'С 11 утра', null); SELECT * FROM t; update t set time_from = LOWER(time_from), nullable = IF(nullable is null or nullable = '', 1, nullable) ; SELECT * FROM t;
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