小编Ame*_*kar的帖子

尝试通过 MySQL 中的存储过程进行选择时出现以下错误

操作“=”的排序规则 (utf8mb4_unicode_ci,IMPLICIT) 和 (utf8mb4_general_ci,IMPLICIT) 的非法混合。

SHOW VARIABLES WHERE Variable_name LIKE 'character\_set\_%'   or Variable_name LIKE 'collation%';

    'character_set_client',     'utf8'
    'character_set_connection', 'utf8'
    'character_set_database',   'utf8mb4'
    'character_set_filesystem', 'binary'
    'character_set_results',    'utf8'
    'character_set_server',     'utf8mb4'
    'character_set_system',     'utf8'
    'collation_connection',     'utf8_general_ci'
    'collation_database',       'utf8mb4_unicode_ci'
    'collation_server',         'utf8mb4_unicode_ci'

所有表都在 utf8mb4_unicode_ci 中，字符集为 utf8mb4。

存储过程代码：

CREATE DEFINER=`dev_user`@`%` PROCEDURE `UPLOAD_ROSTER_FOR_DISTRICT`(IN JOBID INT, IN CHUNKID INT, IN DISTRICTID INT, IN DISTRICTYEARID INT)
BEGIN 

DECLARE STUDENTSADDED INT DEFAULT 0; 
DECLARE CLASSESADDED INT DEFAULT 0; 
DECLARE TEACHERSADDED INT DEFAULT 0; 
DECLARE STUDENTSEDITED INT DEFAULT 0; 
DECLARE …