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sql与mongo查询对比

2014-06-03 13:41 246 查看
SQL Statement

Mongo Statement

CREATE TABLE USERS (a Number, b Number)

implicit; can also be done explicitly with

db.createCollection("mycoll")

ALTER TABLE users ADD ...

implicit

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

db.users.find({age:33}).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 name LIKE "%Joe%"

db.users.find({name:/Joe/})

SELECT * FROM users WHERE name LIKE "Joe%"

db.users.find({name:/^Joe/})

SELECT * FROM users WHERE age>33 AND age<=40

db.users.find({'age':{$gt:33,$lte:40}})

SELECT * FROM users ORDER BY name DESC

db.users.find().sort({name:-1})

SELECT * FROM users WHERE a=1 and b='q'

db.users.find({a:1,b:'q'})

SELECT * FROM users LIMIT 10 SKIP 20

db.users.find().limit(10).skip(20)

SELECT * FROM users WHERE a=1 or b=2

db.users.find( { $or : [ { a : 1 } , { b : 2 } ] } )

SELECT * FROM users LIMIT 1

db.users.findOne()

SELECT order_id FROM orders o, order_line_items li WHERE li.order_id=o.order_id AND li.sku=12345

db.orders.find({"items.sku":12345},{_id:1})

SELECT customer.name FROM customers,orders WHERE orders.id="q179" AND orders.custid=customer.id

var o = db.orders.findOne({_id:"q179"});

var name = db.customers.findOne({_id:o.custid})

SELECT DISTINCT last_name FROM users

db.users.distinct('last_name')

SELECT COUNT(*y)

FROM users

db.users.count()

SELECT COUNT(*y)

FROM users where AGE > 30

db.users.find({age: {'$gt': 30}}).count()

SELECT COUNT(AGE) from users

db.users.find({age: {'$exists':true}}).count()

CREATE INDEX myindexname ON users(name)

db.users.ensureIndex({name:1})

CREATE INDEX myindexname ON users(name,ts DESC)

db.users.ensureIndex({name:1,ts:-1})

EXPLAIN SELECT * FROM users WHERE z=3

db.users.find({z:3}).explain()

UPDATE users SET a=1 WHERE b='q'

db.users.update({b:'q'}, {$set:{a:1}},false, true)

UPDATE users SET a=a+2 WHERE b='q'

db.users.update({b:'q'}, {$inc:{a:2}},false, true)

DELETE FROM users WHERE z="abc"

db.users.remove({z:'abc'});

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