| 数据库 | ElasticSearch | MongoDB |
| database | es库 | database |
| table表 | index索引 | collection数据集合 |
| row行（记录） | document文档(json) | document文档(json) |
| column字段列 | field域 | field域 |
| index索引 | - | index索引 |
| join表关联查询 | - | - |
| pk主键 | _id | _id |
UserList:[
{
userId: "1001",
username: "lee",
age: 18
},
{
userId: "1002",
username: "jay",
age: 20,
sex: "boy"
},
]
原文：https://www.cnblogs.com/ouyangbo/p/14620075.html