MongoDB語法與SQL語法比較
阿新 • • 發佈：2018-12-14
| MongoDB語法 | MySql語法 |
|---|---|
| db.test.find({‘ID’:10}).count() | select count(*) from test where ID=10 |
| db.test.find({‘name’:‘foobar’}) | select * from test where name=‘foobar’ |
| db.test.find() | select *from test |
| db.test.find().skip(10).limit(20) | select * from test limit 10,20 |
| db.test.find({‘ID’:{$in:[18,25,36]}}) | select * from test where ID in (18,25,36) |
| db.test.find().sort({‘ID’:-1}) | select * from test order by IDdesc |
| db.test.distinct(‘name’,{‘ID’:{$lt:20}}) | select distinct(name) from testwhere ID<20 |
| db.test.find(‘this.ID<20’,{name:1}) | select name from test whereID<20 |
| db.test.insert({‘name’:‘foobar’,‘age’:25} | insertinto test (‘name’,‘age’) values(‘foobar’,25) |
| db.test.remove({‘age’:24}) | delete test where age=24 |
| db.test.remove({‘age’:{$lt:24}}) | delete test where age<24 |
| db.test.remove({‘age’:{$lte:24}}) | delete test where age<=24 |
| db.test.remove({‘age’:{$gt:24}}) | delete test where age>24 |
| db.test.remove({‘age’:{$gte:24}}) | delete test where age>=24 |
| db.test.remove({‘age’:{$ne:24}}) | delete test where age!=24 |
| db.test.update({‘name’:‘foobar’},{$set:{‘age’:36}}) | update test set age=36 where name=‘foobar’ |
| db.test.update({‘name’:‘foobar’},{$inc:{‘age’:3}}) | update test set age=age+3 where name=‘foobar’ |
模糊查詢：$regex
db.test.find({“name”:{$regex:“aaa”}})
分組個數過濾
db.getCollection(‘id_mapper’).aggregate([{KaTeX parse error: Expected '}', got 'EOF' at end of input: group:{ _id :"contract_id",count:{KaTeX parse error: Expected 'EOF', got '}' at position 6: sum:1}̲}},{match:{count:{$gt:1}}}])
判斷是否為空
db.getCollection(‘id_mapper’).find({“sinocardid”:{$in:[null]}})