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specified key was too long 767 bytes
時間 2021-01-05
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數據庫字符編碼問題 允許索引字段前綴的字節限制爲 767 bytes,且: 當字符集爲 utf8mb4 時,一個字符對應 4 bytes; 當字符集爲 utf8 時,一個字符對應 3 bytes; 所以對於(一)中的問題: 字符集爲 utf8mb4, 所以可申請索引的 varchar 長度爲:767/4 ≈ 191; 而字符集爲 utf8 時,可設置的創建索引 varchar 長度爲: 767/3
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Specified key was too long; max key length is 767
2.
[Err] 1071 - Specified key was too long; max key length is 767 bytes
3.
MySQL | Specified key was too long; max key length is 767 bytes
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django.db.utils.OperationalError: (1071, 'Specified key was too long; max key length is 767 bytes')
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Specified key was too long; max key length is 767 bytes。
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ERROR 1071 (42000): Specified key was too long; max key length is 767 bytes
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