4.15 避免索引列上 IS NULL 和 IS NOT NULL.....................................................................................................21
4.16 避免改变索引列的类型.(隐式转换)..........................................................................................................22
4.17 索引列上不要进行计算....................................................................................................................................23
4.18 索引列上>=代替>.............................................................................................................................................23
4.19 避免使用耗费资源的操作................................................................................................................................23
4.20 分离表和索引....................................................................................................................................................24
4.21 复杂操作封装优化............................................................................................................................................24
5 附录.........................................................................................................................................................................24
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