-- OA 表与 sys_user 等系统表排序规则对齐
-- 问题：oa_* 建表仅写 DEFAULT CHARSET=utf8mb4，MySQL 5.7 默认 utf8mb4_general_ci；
--       sys_user.id 等为 utf8mb4_unicode_ci，JOIN 报 1267 Illegal mix of collations。
-- 执行前请备份；可重复执行。

ALTER TABLE oa_app_group CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE oa_app CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE oa_app_version CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE oa_role CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE oa_role_user CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE oa_instance CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE oa_task CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE oa_relation CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE oa_instance_event CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;