sql remove_comments.sql

Posted 2021-05-13

-- 批量删除表注释
SELECT
    concat( 'alter table ', '`', table_name, '` ', 'COMMENT=\'\'', ';' ) AS column_definition
FROM
    information_schema.TABLES
WHERE
    table_schema LIKE ( SELECT DATABASE ( ) )

-- 批量删除字段注释
SELECT
    concat(
    'alter table ',
    '`',
    table_name,
    '` ',
    'modify column `',
    column_name,
    '` ',
    column_type,
    ifnull( concat( ' character set ', character_set_name ), '' ),
    ifnull( concat( ' collate ', collation_name ), '' ),
IF
    ( is_nullable = 'no', ' not null ', '' ),
IF
    ( column_default IS NULL, '', concat( ' default ', quote( column_default ) ) ),
    ' ',
    extra,
    ';'
) AS column_definition
FROM
    information_schema.COLUMNS
WHERE
    table_schema LIKE ( SELECT DATABASE ( ) )
    AND column_comment IS NOT NULL;