SET @preparedStatement = (SELECT IF(
    (
        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
        WHERE table_name = 'NotifyAdmin'
        AND table_schema = DATABASE()
        AND column_name = 'RequiredFeature'
        AND column_type != 'varchar(100)'
    ) > 0,
    'ALTER TABLE NotifyAdmin MODIFY COLUMN RequiredFeature varchar(100);',
    'SELECT 1'
));
PREPARE alterIfExists FROM @preparedStatement;
EXECUTE alterIfExists;
DEALLOCATE PREPARE alterIfExists;

SET @preparedStatement = (SELECT IF(
    (
        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
        WHERE table_name = 'NotifyAdmin'
        AND table_schema = DATABASE()
        AND column_name = 'RequiredPlan'
        AND column_type != 'varchar(26)'
    ) > 0,
    'ALTER TABLE NotifyAdmin MODIFY COLUMN RequiredPlan varchar(26);',
    'SELECT 1'
));
PREPARE alterIfExists FROM @preparedStatement;
EXECUTE alterIfExists;
DEALLOCATE PREPARE alterIfExists;