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编写MongoDB查询命令的时候，索引字段在查询条件中的位置对查询性能有影响吗？
例如字段A为myCollection的索引
db.myCollection.find({A:"xx", B: "yy"})db.myCollection.find({B:"yy", A: "xx"})
这两个查询的效率有区别吗？
@x4_965be
印象中這應該是沒什麼區別的~
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