Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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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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