常見例句雙語例句Currently a sparse index can have only one field.目前，Sparse索引只能有一個字段。Covering indexes allow data storage within the index itself while sparse indexes exclude documents that do not contain the missing field.?Covered索引允許?在索引本身里存儲數(shù)據(jù)，而 ?Sparse索引則會排除掉不包含索引字段的文檔。 返回 sparse index