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MySQL索引背后的之使用策略及优化

发表于 2025-11-05 05:40:07 来源:益强智未来
MySQL索引背后的之使用策略及优化
引背用策优化复制SHOW INDEXFROM employees.titles;  +--------+------------+----------+--------------+-------------+-----------+-------------+------+------------+ | Table  | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Null | Index_type |  +--------+------------+----------+--------------+-------------+-----------+-------------+------+------------+ | titles |          0 | PRIMARY  |            1 | emp_no      | A         |        NULL |      | BTREE      |  | titles |          0 | PRIMARY  |            2 | title       | A         |        NULL |      | BTREE      |  | titles |          0 | PRIMARY  |            3 | from_date   | A         |      443308 |      | BTREE      |  | titles |          1 | emp_no   |            1 | emp_no      | A         |      443308 |      | BTREE      |  +--------+------------+----------+--------------+-------------+-----------+-------------+------+------------+ 1.2.3.4.5.6.7.8.9.
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