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Arduino Projects
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- What is RFID? How It Works? Interface RC522 RFID Module with Arduino
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ESP32 Projects
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- ESP32 Basic Over The Air (OTA) Programming In Arduino IDE
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ESP8266 Projects
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- ESP8266 Over The Air (OTA) Programming In Arduino IDE
- Getting Date & Time From NTP Server With ESP8266 NodeMCU
- Control WS2812B Addressable LEDs with ESP8266 and WLED
- Interface DHT11 DHT22 w/ ESP8266 NodeMCU Using Web Server
- How to Use an I2C LCD Display With ESP8266
- Interface OLED Graphic Display Module with ESP8266 NodeMCU
- Display Values of Multiple DS18B20s on ESP8266 NodeMCU Web Server
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Excel
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MongoDB Aggregation `$count`

Aggregation `$count`

This aggregation stage counts the total amount of documents passed from the previous stage.

Example

In this example, we are using the "sample_restaurants" database loaded from our sample data in the section.

db.restaurants.aggregate([
  {
    $match: { "cuisine": "Chinese" }
  },
  {
    $count: "totalChinese"
  }
])

This will return the number of documents at the $count stage as a field called "totalChinese".

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MongoDB Aggregation $count

Aggregation $count

Example

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MongoDB Aggregation `$count`

Aggregation `$count`