MongoDB语法与SQL语法比较
2011-12-15 18:26
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MongoDB语法 MySql语法
db.test.find({'name':'foobar'}) <==> select * from test where name='foobar'
db.test.find() <==> select * from test
db.test.find({'ID':10}).count() <==> select count(*) from test where ID=10
db.test.find().skip(10).limit(20) <==> select * from test limit 10,20
db.test.find({'ID':{$in:[25,35,45]}}) <==> select * from test where ID in (25,35,45)
db.test.find().sort({'ID':-1}) <==> select * from test order by ID desc
db.test.distinct('name',{'ID':{$lt:20}}) <==> select distinct(name) from test where ID<20
db.test.group({key:{'name':true},cond:{'name':'foo'},reduce:function(obj,prev){prev.msum+=obj.marks;},initial:{msum:0}})
<==> select name,sum(marks) from test group by name
db.test.find('this.ID<20',{name:1}) <==> select name from test where ID<20
db.test.insert({'name':'foobar','age':25})<==>insert into test ('name','age') values('foobar',25)
db.test.remove({}) <==> delete * from test
db.test.remove({'age':20}) <==> delete test where age=20
db.test.remove({'age':{$lt:20}}) <==> elete test where age<20
db.test.remove({'age':{$lte:20}}) <==> delete test where age<=20
db.test.remove({'age':{$gt:20}}) <==> delete test where age>20
db.test.remove({'age':{$gte:20}}) <==> delete test where age>=20
db.test.remove({'age':{$ne:20}}) <==> delete test where age!=20
db.test.update({'name':'foobar'},{$set:{'age':36}}) <==> update test set age=36 where name='foobar'
db.test.update({'name':'foobar'},{$inc:{'age':3}}) <==> update test set age=age+3 where name='foobar'
sql语法和MongoDB语法的对应关系
sql语法和MongoDB语法的对应关系
db.test.find({'name':'foobar'}) <==> select * from test where name='foobar'
db.test.find() <==> select * from test
db.test.find({'ID':10}).count() <==> select count(*) from test where ID=10
db.test.find().skip(10).limit(20) <==> select * from test limit 10,20
db.test.find({'ID':{$in:[25,35,45]}}) <==> select * from test where ID in (25,35,45)
db.test.find().sort({'ID':-1}) <==> select * from test order by ID desc
db.test.distinct('name',{'ID':{$lt:20}}) <==> select distinct(name) from test where ID<20
db.test.group({key:{'name':true},cond:{'name':'foo'},reduce:function(obj,prev){prev.msum+=obj.marks;},initial:{msum:0}})
<==> select name,sum(marks) from test group by name
db.test.find('this.ID<20',{name:1}) <==> select name from test where ID<20
db.test.insert({'name':'foobar','age':25})<==>insert into test ('name','age') values('foobar',25)
db.test.remove({}) <==> delete * from test
db.test.remove({'age':20}) <==> delete test where age=20
db.test.remove({'age':{$lt:20}}) <==> elete test where age<20
db.test.remove({'age':{$lte:20}}) <==> delete test where age<=20
db.test.remove({'age':{$gt:20}}) <==> delete test where age>20
db.test.remove({'age':{$gte:20}}) <==> delete test where age>=20
db.test.remove({'age':{$ne:20}}) <==> delete test where age!=20
db.test.update({'name':'foobar'},{$set:{'age':36}}) <==> update test set age=36 where name='foobar'
db.test.update({'name':'foobar'},{$inc:{'age':3}}) <==> update test set age=age+3 where name='foobar'
sql语法和MongoDB语法的对应关系
sql语法和MongoDB语法的对应关系
SQL Statement | Mongo Query Language Statement |
CREATE TABLE USERS (a Number, b Number) | db.createCollection("mycoll", {capped:true, size:100000}) |
INSERT INTO USERS VALUES(1,1) | db.users.insert({a:1,b:1}) |
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':{$gt:33}})}) |
SELECT * FROM users WHERE age<33 | db.users.find({'age':{$lt: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}) |
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}) |
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( { $or : [ { a : 1 } , { b : 2 } ] } ) |
SELECT * FROM users LIMIT 1 | db.users.findOne() |
EXPLAIN SELECT * FROM users WHERE z=3 | db.users.find({z:3}).explain() |
SELECT DISTINCT last_name FROM users | db.users.distinct('last_name') |
SELECT COUNT(*y) FROM users | db.users.count() |
SELECT COUNT(*y) FROM users where AGE > 30 | db.users.find({age: {'$gt': 30}}).count() |
SELECT COUNT(AGE) from users | db.users.find({age: {'$exists': true}}).count() |
UPDATE users SET a=1 WHERE b='q' | db.users.update({b:'q'}, {$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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