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column_type group_concat(table_schema, '.', table_name) num
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varchar(20) information_schema.PLUGINS 1
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varchar(27) information_schema.COLUMNS 1
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select CHARACTER_MAXIMUM_LENGTH, CHARACTER_OCTET_LENGTH from
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information_schema.columns where table_schema='test' and table_name = 't1';
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CHARACTER_MAXIMUM_LENGTH CHARACTER_OCTET_LENGTH
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create table t1(f1 char(5));