## SQL
**CREATE**
```SQL
CREATE TABLE users (
        id MEDIUMINT NOT NULL AUTO_INCREMENT,
        name Varchar(30),
        age Number,
        alias Varchar(20),
        PRIMARY KEY (id)
)
```
**ALTER**
```SQL
ALTER TABLE users ADD join_date DATETIME
ALTER TABLE users DROP COLUMN join_date
```
## NoSQL with MongoDB
**CREATE**
```BSON
db.users.insertOne(
        {
          name  : "Marcela Sena",
          age   : 29,
          alias : "MarceStarlet"
        }
)
```
**ALTER**
```BSON
db.users.updateMany(
    { },
    { $set: { join_date: new Date() } }
)
db.users.updateMany(
    { },
    { $unset: { "join_date": "" } }
)
```