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02. Spring – Creating spring project clone it with GIT step by step.

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02.What is MicroService?

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    Project can be download from         https://github.com/LahiruPriyankara/SpringBootAppTwo-MongoDB MongoDB Aggregation This groups values from multiple documents together and can perform variety of operations on that grouped data.it is going to return single result after the aggregation. Stages In Aggregation: Those operation are used in group of documents ( Used inside aggregation stages).  Unary Operation -  Unary operator perform operation for each documents. Type - Given the type of the filed. In the SQL we query select count and in the bracket Astrix this count for aggregation. It return the number of rows. This is same in mongoDB. db . employee . aggregate ([ { $group : { _id : "$gender" , genderCount : { $sum : 1 } } } ]) // $sum: 1 :1 - true db . employee . aggregate ([ { $group : { _id : "$gender" , maxAge : { $max : "$age" } } } ]) Bellow example is from  https://docs.mongodb.com/manual/aggregation/ Single Purpose Aggregation
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