Tag：Ronaldinho
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Time：2020-3-5
1. Conditional operator The conditional operator is used to compare two expressions and get data from the mongodb collection. The condition operators in mongodb are: (>) greater than – $GT (< less than – $LT (> =) greater than or equal to – $GTE (< =) less than or equal to – $LTE Clear set […]
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Time：2020-2-29
1. Create database grammar use DATABASE_NAME Create a database of user? Data, and use the DB command to view > use user_data switched to db user_data > db user_data > View all databases using show DBS > show dbs admin 0.000GB config 0.000GB local 0.000GB test 0.000GB As you can see, the newly created database […]
