SET @table_schema = DATABASE();

SET @ddl = IF(
    EXISTS(
        SELECT 1
        FROM information_schema.COLUMNS
        WHERE TABLE_SCHEMA = @table_schema
          AND TABLE_NAME = 'team_manager_base_info'
          AND COLUMN_NAME = 'can_change_country'
    ),
    'SELECT 1',
    "ALTER TABLE `team_manager_base_info` ADD COLUMN `can_change_country` tinyint(1) NOT NULL DEFAULT 1 COMMENT '经理中心是否允许修改用户国家' AFTER `can_unban_user`"
);
PREPARE stmt FROM @ddl;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;