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只有blob和text类型的列在创建索引时，mysql才强制要求需要指定索引的前缀长度（键长度）
---
 notes/MySQL.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/notes/MySQL.md b/notes/MySQL.md
index b9fcfa2c..b8ee59c3 100644
--- a/notes/MySQL.md
+++ b/notes/MySQL.md
@@ -166,6 +166,7 @@ CREATE TABLE test (blob_col BLOB, INDEX(blob_col(10)));
 https://dev.mysql.com/doc/refman/5.7/en/column-indexes.html#column-indexes-prefix
 
 对于VARCHAR和CHAR类型的列，不强制要求使用前缀索引，根据业务自行选择即可
+
 前缀长度的选取需要根据索引选择性来确定。
 
 ### 5. 覆盖索引