解決： java.sql.SQLException: Illegal mix of collations for operation 'UNION'
出現這個異常後，網上查詢解決方案，大多數說法是MySQL庫表在UNION時字段COLLATION的編碼設置不一樣，utf8mb4_general_ci vs. utf8mb4_unicode_ci。可是我將全部字段的COLLATION設置相同後，仍然報 java.sql.SQLException: Illegal mix of collations for operation 'UNION'。因而
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