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SQL与MongoDB查询语句对比
发布时间：2014-9-16 16:13 Tuesday编辑：张立荣
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SQL语句 |
MongoDB语句 |
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CREATE TABLE USER(a number,b number) |
Implicit;can also be done explicitly withdb.craetecollection(“mycoll”) |
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Alter table ysers add... |
Implicit |
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Insert into user (a,b) values(3,5) |
Db.users.insert({a:3,b:5}) |
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Select a,b from users |
Db.user.find({},{a:1.b:1}) |
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Select * from users |
Db.users.find() |
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Select * from user where age=33 |
Db.user.find({age:33}) |
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Select a,b from user where age=33 |
Db.user.find({age:33},{a:1,b:1}) |
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SELECT * FROM users WHERE age=33 ORDER BY name |
Db.users.find({age:33}).sort({name:1}) |
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SELECT * FROM users WHERE age>33 |
db.users.find({age:{$gt:33}}) |
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SELECT * FROM users WHERE age!=33 |
db.users.find({age:{$ne:33}}) |
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SELECT * FROM users WHERE name LIKE "%Joe%" |
Db.users.find({find:/Joe/}) |
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SELECT * FROM users WHERE name LIKE "Joe%" |
Db.users.find({find:/^Joe/}) |
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SELECT * FROM users WHERE age>33 AND age<=40 |
db.users.find({'age':{$gt:33,$lte:40}}) |
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SELECT * FROM users ORDER BY name DESC |
db.users.find().sort({name:-1}) |
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SELECT * FROM users WHERE a=1 and b='q' |
db.users.find({a:1,b:'q'}) |
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SELECT * FROM users LIMIT 10 SKIP 20 |
db.users.find().limit(10).skip(20) |
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SELECT * FROM users WHERE a=1 or b=2 |
db.users.find( { $or : [ { a : 1 } , { b : 2 } ] } ) |
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SELECT * FROM users LIMIT 1 |
db.users.findOne() |
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SELECT order_id FROM orders o, order_line_items li WHERE li.order_id=o.order_id AND li.sku=12345 |
db.orders.find({"items.sku":12345},{_id:1}) |
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SELECT customer.name FROM customers,orders WHERE orders.id="q179" AND orders.custid=customer.id
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var o = db.orders.findOne({_id:"q179"}); var name = db.customers.findOne({_id:o.custid})
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SELECT DISTINCT last_name FROM users |
db.users.distinct('last_name') |
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SELECT COUNT(*y) FROM users |
db.users.count() |
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SELECT COUNT(*y) FROM users where AGE > 30 |
db.users.find({age: {'$gt': 30}}).count() |
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SELECT COUNT(AGE) from users |
db.users.find({age: {'$exists': true}}).count() |
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CREATE INDEX myindexname ON users(name) |
db.users.ensureIndex({name:1}) |
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CREATE INDEX myindexname ON users(name,ts DESC)
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db.users.ensureIndex({name:1,ts:-1}) |
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EXPLAIN SELECT * FROM users WHERE z=3 |
db.users.find({z:3}).explain() |
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UPDATE users SET a=1 WHERE b='q' |
db.users.update({b:'q'}, {$set:{a:1}}, false, true) |
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UPDATE users SET a=a+2 WHERE b='q' |
db.users.update({b:'q'}, {$inc:{a:2}}, false, true) |
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DELETE FROM users WHERE z="abc" |
db.users.remove({z:'abc'}); |
关键字词：标签: mongoDB
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