当我运行以下查询时：
CREATE ALGORITHM = UNDEFINED VIEW d_view_galerias AS (
SELECT id, titulo, 'foto' AS tipo, '' AS embed
FROM d_galeria_fotos
)
UNION (
SELECT id, titulo, 'video' AS tipo, embed
FROM d_galeria_videos
)
我得到错误：
操作'='的排序规则（utf8_unicode_ci，COERCIBLE）和（utf8_general_ci，COERCIBLE）的非法混合
“ tipo”的格式为utf8_unicode，但其他字段的格式为utf8_general ...如何进行转换，转换？