SQL statements and their MongoDB equivalents

SQL statements  can be mapped to their corresponding MongoDB statement. Lets start with CRUD operations.

1. CREATE:

CREATE TABLE customers (
id NOT NULL AUTO_INCREMENT,
firstName Varchar(100),
lastName Varchar(100),
phone Varchar(20),
PRIMARY KEY (id)
)

MongoDB Equivalence for CREATE is a little different. Either we can create a collection or simply insert the data.

db.createCollection("customers");

db.customers.insertOne({
  firstName: "Abebe",
  lastName: "Mulaw",
  phone: "09xxxxxxxx"
})

2. READ: reading data from tables using both SQL and MongoDB statements is a little bit easier comparing to the other operations.

SELECT * FROM customers;

db.customers.find({})

If you we want to select specific fields,

SELECT firstName, lastName FROM customers;

db.customers.find({},{
firstName: 1,
lastName: 1
})

If we want to use condition :

SELECT firstName, lastName FROM customers
WHERE phone = '09xxxxxxx';

db.customers.find({
phone: '09xxxxxx'
},{
firstName: 1,
lastName: 1
})

3. UPDATE:  During update in SQL and MongoDB, we can target a single row of data or multiple rows based on some criteria.

UPDATE customers
SET firstName = "Tomas"
WHERE phone = "09xxxxx"

db.customers.updateOne({
 {phone: "09xxxxx"},
 {$set: {firstName: "Tomas"}}
})

Note: We can use MongoDB’s updateMany method to update multiple rows of data.

Example: If we want all customers to have the same phone number

db.customers.updateMany({
 {},
 {$set: {phone: "0911xxxxx"}}
})

4. DELETE: To delete records, We can target single record or multiple records based on criteria’s.

DELETE FROM customers
WHERE phone = '09xxxxxx'

db.customers.deleteOne({
 {phone: "0911xxxxx"}
})

We can also delete records with deleteMany method if there are records with same field.

db.customers.deleteMany({
 {phone: "0911xxxxx"}
})

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