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Mongo DB statements

Posted on | by Dan

1) For the Mongo DB statements / commands, explain what the output would be. (whatsapp/ 00966559712545)
• Using a new command prompt, we type C:\Users\Uma Radhakrishnan> cd c:\Program Files\MongoDB\Server\5.0\bin
C:\Program Files\MongoDB\Server\5.0\bin> mongod –dbpath F:mongodb5\data\db
What are you achieving by this command?
• Using a new command prompt page, we type C:\Users\Uma Radhakrishnan>cd C:\Program Files\MongoDB\Server\5.0\bin
C:\Program Files\MongoDB\Server\5.0\bin>mongo
What are you achieving by this command?

• We type> use myoldstudents
What are you achieving by this command?

• We type >
db.myusers.insertMany([{“name”:”steve”,”profession”:”cricket”,age:44},{“name”:”john”,”hobby”:”fielding”,age:61″,”date_join”:”2020-11-01″ }])

What is the name of the collections?

What are you achieving by this command?

• We type > db.myusers.find({age:{$lt:50}})
What are you achieving by this command?

• We type > db.myusers.updateMany({age:{$gt:40}},{$set:{“category”:”player”}})
What are you achieving by this command?

• We type > db.myusers.findAndModify({query:{“name”:”steve”},update:{$inc:{age:5}}})
What are you achieving by this command?
What will be the output?

• We type > db.myusers.findAndModify({query:{“name”:”steve”},update:{$inc:{age:5}}})

Then, we type, > db.myusers.find().pretty()
What will be the output?

• We type > db.myusers.find({date_join: {$lt: “2020-12-01”}}).pretty()
What will be the output?

• We type > db.purchaseorders.insertMany([{“pdt”:”water”,total:5.75,”customer”:”mike”},{“pdt”:”coke”,total:14.75,”customer”:”john”},{“pdt”:”rice”,total:24.75,”customer”:”asha”},{“pdt”:”water”,total:5.75,”customer”:”peter”},{“pdt”:”milk”,total:4.75,”customer”:”mike”}])

Then we type, > db.purchaseorders.aggregate([{$match:{}},{$group:{_id:”$customer”,total:{$sum:”$total”}}}])

What will be the output?
• What is the fundamental difference between MYSQL database and MongoDB database?
• Why are we not writing joins in MongoDB database?

Sample Solution

usinesses and their employees to increase their profit margins. “Monopoly power allows a company that has eaten up an entire industry to fix prices for consumers, driving them higher than they would be if other companies were able to compete in the same market and offer lower prices.” (Covert, 3). In the Gilded Age, the monopolies like Andrew Carnegie’s U.S. Steel or John D. Rockefeller’s Oil refinery etc. controlled the economics of United States. But also, today it is “impossible for employees to leave for a better-paying job elsewhere” (Covert, 3). Companies regulate their own prices, in favor of their profit. The main goal of almost every business person, is to get the highest most possible profit and win. Customers will prefer a company which offers the lowest price and will regard the high-price-companies. Even though, most of the people would say, that monopolies do not have a big influence on the economic, as it was back then in the Gilded Age. Nevertheless, it still does affect the way how customers think or handle by regulating very cheap prices, manipulate smaller businesses and do not increasing the wages. Monopolies in the Gilded Age brought many jobs to the nation’s citizen, but they also set the wage very low, why also labor unions were created. Some obdurate Politician took benefit on the monopolies to strengthen their campaigns for their presidential elections, like the one in 1896 between Democrat W. Bryan and Republican W. McKinley, which was won by the Republican because the employees/voters were dependent on their job which were given by the monopolies (in cooperation to the Republican McKinley). But also, today some companies keep their wages by the minimum of $7.25 an hour. They also beat small businesses down by keeping the selling prices as low as possible to make the buyer a favor on their own industry and so other businesses go down and their will become a monopoly. Although most of the people will say that the conditions are different now than back then in the 19th century, but monopolies still do have a big influence on other businesses, the economic and politics. Back to Charles Darrow’s legendary board game “Monopoly”, it is really obvious how the rise of a monopoly can influence other players. Of course, this is the point of the game to get a monopoly, to leave the other players only one way, and to collect all the money by oneself. Indeed, it is only a game, but however this is also to find in the modern society and ancient history.
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