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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                >[info] MongoDB 條件操作符 **MongoDB中條件操作符有:** * (>) 大于 - $gt * (<) 小于 - $lt * (>=) 大于等于 - $gte * (<= ) 小于等于 - $lte **示例:** ``` // 獲取"col"集合中 "likes" 大于等于 100 的數據 // Select * from col where likes >=100; db.col.find({likes : {$gte : 100}}) // 組合(Select * from col where likes>100 AND likes<200;) db.col.find({likes : {$lt :200, $gt : 100}}) ``` >[info] $type 操作符 $type操作符是基于BSON類型來檢索集合中匹配的數據類型,并返回結果。 | **類型** | **數字** | **備注** | | --- | --- | --- | | Double | 1 | ? | | String | 2 | ? | | Object | 3 | ? | | Array | 4 | ? | | Binary data | 5 | ? | | Undefined | 6 | 已廢棄。 | | Object id | 7 | ? | | Boolean | 8 | ? | | Date | 9 | ? | | Null | 10 | ? | | Regular Expression | 11 | ? | | JavaScript | 13 | ? | | Symbol | 14 | ? | | JavaScript (with scope) | 15 | ? | | 32-bit integer | 16 | ? | | Timestamp | 17 | ? | | 64-bit integer | 18 | ? | | Min key | 255 | Query with\-1. | | Max key | 127 | ? | **示例:** ``` // 如果想獲取 "col" 集合中 title 為 String 的數據 db.col.find({"title" : {$type : 2}}) 或 db.col.find({"title" : {$type : 'string'}}) ```
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