MySQL MongoDB SQL 对应

	SQL statement	Mongo statement
DDL	CREATE TABLE users (id INT AUTO_INCREMENT PRIMARY KEY, a INT, b INT, age INT, name CHAR(32))	implicit; can also be done explicitly with db.createCollection("user1")
	ALTER TABLE users ADD ...	implicit
	DROP TABLE users	db.users.drop()
	CREATE DATABSE db_name	implicite
	SHOW DATABASES	show dbs
	USE db_name	use db_name
	SHOW TABLES	show collections
	CREATE INDEX idx_name ON users(name)	db.users.ensureIndex({name : 1})
	CREATE INDEX idx_name_ts ON users(name, ts DESC)	db.users.ensureIndex({name : 1, ts : -1})
	DROP INDEX idx_name ON users	db.users.dropIndex({name : 1, ts : -1})
	SHOW INDEXES FROM users	db.users.getIndexes()
DML	INSERT INTO users VALUES(3, 5)	db.users.insert({a: 3, b: 5})
	SELECT a, b FROM users	db.users.find({}, {a : 1, b: 1})
	SELECT * FROM users	db.users.find()
	SELECT * FROM users WHERE age = 33	db.users.find({age : 33})
	SELECT a, b FROM users WHERE age = 33	db.users.find({age : 33}, {a : 1, b : 1})
	SELECT * FROM users WHERE age = 33 ORDER BY name ASC	db.users.find({age : 33}).sort({name : 1})
	SELECT * FROM users ORDER BY name DESC	db.users.find().sort({name : -1})
	SELECT * FROM users WHERE age > 33	db.users.find({age : {$gt : 33}})
	SELECT * FROM users WHERE age != 33	db.users.find({age : {$ne : 33}})
	SELECT * FROM users WHERE age > 33 AND age <= 44	db.users.find({age : {$gt: 33, $lte : 44}})
	SELECT * FROM users WHERE name LIKE "%Joe%"	db.users.find({name : /Joe/})
	SELECT * FROM users WHERE id IN (3, 4, 5)	db.users.find({id, {$in : [3, 4, 5]}})
	SELECT * FROM users WHERE id NOT IN (3, 4, 5)	db.users.find({id, {$nin : [3, 4, 5]}})
	SELECT * FROM users WHERE id = 2	db.users.find({id , {$all : [2]}})
	SELECT * FROM users WHERE a = 1 AND name = 'Joe'	db.users.find({ a : 1, name : 'Joe'})
	SELECT * FROM users WHERE a = 1 OR b = 2	db.users.find({$or : [{a : 1}, {b : 2}]})
	SELECT * FROM users WHERE name LIKE "Joe%"	db.users.find({name : /^Joe/})
	SELECT * FROM users WHERE name LIKE "%Joe"	db.users.find({name : /Joe$/})
	SELECT * FROM users LIMIT 20, 10	db.users.find().limit(10).skip(20)
	SELECT * FROM users LIMIT 1	db.users.findOne()
	SELECT id FROM users u , users_extend e WHERE u.user_id = e.user_id AND e.c = 12345	db.users.find({"users_extend.c" : 12345}, {_id : 1})
	SELECT customer.name FROM customers, orders WHERE orders.id = "q139" AND orders.custid = customers.id	var o = db.orders.findOne({_id : "q139"}) var name = db.customers.findOne({_id : o.custid})
	EXPLAIN SELECT * FROM users WHERE a = 3	db.users.find({a : 3}).explain()
	UPDATE users SET a = 1 WHERE b = 2	db.users.update({b : 2}, {$set : {a : 1}}, false, true)
	UPDATE users SET a = a + 2 WHERE b = 2	db.users.update({b : 2}, {$inc: {a : 2}}, false, true)
	DELETE FROM users WHERE a = 3	db.users.remove({ a : 3})
	DELETE FROM users	db.users.remove()