MongoDB与SQL常用语法对应表

5行代码，即可让微信小程序上架到自己的APP中 | 注册送大疆、华为、樱桃键盘！>>>

    对于经常写SQL的同学，一开始写mongoDB的语法会十分不习惯，下表整理了常见的SQL语法，函数以及相应的MongoDB对应语法，仅供参考。

 

术语及概念

SQL	MongoDB
database	database
table	collection
row	document
column	field
index	index
table joins	$lookup
primary key	primary key
SELECT INTO NEW_TABLE	$out
MERGE INTO TABLE	$merge(mongodb > 4.2)
UNION ALL	$unionWith (mongodb > 4.4)
transactions	transactions

 

语法对应表

SQL	MongoDB
CREATE TABLE people (     id MEDIUMINT NOT NULL         AUTO_INCREMENT,     user_id Varchar(30),     age Number,     status char(1),     PRIMARY KEY (id) )	db.createCollection("people")   db.people.insertOne( {     user_id: "abc123",     age: 55,     status: "A"  } )
ALTER TABLE people ADD join_date DATETIME	db.people.updateMany(     { },     { $set: { join_date: new Date() } } )
ALTER TABLE people DROP COLUMN join_date	db.people.updateMany(     { },     { $unset: { "join_date": "" } } )
CREATE INDEX idx_user_id_asc ON people(user_id)	db.people.createIndex( { user_id: 1 } )
CREATE INDEX        idx_user_id_asc_age_desc ON people(user_id, age DESC)	db.people.createIndex( { user_id: 1, age: -1 } )
DROP TABLE people	db.people.drop()
INSERT INTO people(user_id,                   age,status) VALUES ("bcd001",45,"A")	db.people.insertOne(    { user_id: "bcd001", age: 45, status: "A" } )
SELECT * FROM people	db.people.find()
SELECT id,        user_id,        status FROM people	db.people.find(     { }, &n.........