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PowerDB is an acceptance & maintenance test data management software system designed for electrical testers and contractors. It includes a full-featured integrated forms editor.
> db.inventory.distinct(“item.sku”)//获取item子字段sku的不重复值 结果:[“111”,”222”,”333”] >db.inventory.distinct(“sizes”)//获取数组格式字段的不重复值 结果:[“M”,”S”,”L”] >db.inventory.distinct(“item.sku”,{dept:”A”})//满足dept为A数据的item字段的子字段的不重复...
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ventilation to prevent overheating. Additionally, ourpower distribution blocksprovide safe and efficient distribution of electrical power within panels. Each product is the result of rigorous research and development, ensuring that Leipole Electric remains at the forefront of innovation in the electrical ...
The full-scale input level is specified in the Analog Characteristics speci- fication table. See below for a description of AIN5-AIN6 in Single-Ended Mode. 60,59 Single-Ended Analog Input (Input) - When stereo ADC3 is in Single-Ended Mode, an internal 58,57 analog mux allows selection ...
db.mycollection.find()实现查找mycollection集合中的所有文档。 注:该方式只适用与shell中 (2)mycollection = db.getCollection("mycollection");mycollection.find()。 该方法可以在JavaScript文件和shell中使用 MongoDB提供了很多方法,用于对集合进行一系列的操作,大家可以点击上面的链接查看最新的方法。
The full package, including all access methods, recoverability, and transac- tion support is roughly 200K of text space on common architectures. Cursors In database terminology, a cursor is a pointer into an access method that can be called iteratively to return records in sequence. Berkeley DB...
Check out our noise level chart and corresponding reduction in actual sound pressure level as well as perceived volume. See the full noise db chart here.
layerType:group,modelName:FullModel,visibility:false,sublayers:[ { layerType:group,modelName:Electrical,visibility:false,sublayers:[ { layerType:3DObject,modelName:LightingFixtures,visibility:true, name:LightingFixtures,isEmpty:false, alias:LightingFixtures,id:21, discipline:Electrical } ], name:Electr...