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MongoDB与SQL常用语法对应表
2020-11-06 21:24:52 【程序猿欧文】
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......... |
版权声明
本文为[程序猿欧文]所创,转载请带上原文链接,感谢
https://my.oschina.net/mikeowen/blog/4556607
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