MongoDB语法与现有关系型数据库SQL语法比较

àì夳堔傛蜴生んèń 2022-01-06 07:33 143阅读 0赞

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 IDdesc

db.test.distinct('name',\{'ID':\{$lt:20\}\}) <==> select distinct(name) from testwhere 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 testgroup by name

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(\{\}) <==> delete \* from test

db.test.remove(\{'age':20\}) <==> delete test where age=20

db.test.remove(\{'age':\{$lt:20\}\}) <==> delete 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'

模糊查询：$regex

db.test.find(\{"name":\{$regex:"aaa"\}\})

分组个数过滤

db.getCollection('id\_mapper').aggregate(\[\{$group:\{ \_id :"$contract\_id",count:\{$sum:1\}\}\},\{$match:\{count:\{$gt:1\}\}\}\])

判断是否为空

db.getCollection('id\_mapper').find(\{"sinocardid":\{$in:\[null\]\}\})

转载于:https://www.cnblogs.com/tan-chao/p/11016588.html

MongoDB语法与现有关系型数据库SQL语法比较

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