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This article introduces the relevant knowledge of "what are the basic operation commands of the database". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. The common commands of MySQL are as follows:

Create database name; creates a database

Use databasename; Select Database

Drop database name deletes the database directly without reminding you

Show tables; display table

Detailed description of the describe tablename; table

Add distinct to select to remove duplicate fields

Mysqladmin drop databasename is prompted before deleting the database.

Displays the current mysql version and current date

Select version (), current_date

2. The common commands of MongoDB are as follows:

Db.help (); Help view command prompts

Use yourDB; switch / create database

Show dbs; queries all databases

Db.dropDatabase (); delete the currently used database

Db.getName (); view the database currently in use

Db.version (); current db version

Db.addUser ("name"); add users

Db.addUser ("userName", "pwd123", true)

Show users; displays all current users

Db.removeUser ("userName"); delete user

Db.yourColl.count (); query the number of data items in the current collection

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