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AngularJS
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Arduino Projects
- How HC-SR04 Ultrasonic Sensor Works & Interface It With Arduino
- How HC-SR501 PIR Sensor Works & Interface It With Arduino
- Interfacing DHT11 and DHT22 Sensors with Arduino
- Interface DHT11 Module With Arduino
- Interfacing AM2320 Temperature & Humidity Sensor with Arduino
- Interfacing LM35 Temperature Sensor with Arduino
- How MQ2 Gas/Smoke Sensor Works? & Interface it with Arduino
- How MQ3 Alcohol Sensor Works? & Interface it with Arduino
- How RCWL-0516 Microwave Radar Motion Sensor Works & Interface It With Arduino
- Interfacing DS18B20 1-Wire Digital Temperature Sensor with Arduino
- Interfacing Multiple DS18B20 Digital Temperature Sensors with Arduino
- Interfacing MAX6675 Thermocouple Module with Arduino
- Interfacing SHT31 Temperature & Humidity Sensor with Arduino
- Interfacing HTU21D Temperature & Humidity Sensor with Arduino
- Interfacing Reed Switch with Arduino
- Interfacing Ball Tilt Switch Sensor with Arduino
- Interfacing Soil NPK Sensor with Arduino
- How Soil Moisture Sensor Works and Interface it with Arduino
- Interfacing Capacitive Soil Moisture Sensor with Arduino
- Interfacing MAX4466 Microphone Amplifier Module with Arduino
- Interface Sound Sensor with Arduino and Control Devices With a Clap
- How Water Level Sensor Works and Interface it with Arduino
- How Rain Sensor Works and Interface it with Arduino
- Interfacing Force Sensing Resistor (FSR) with Arduino
- Interfacing Flex Sensor with Arduino
- Monitor the Heart Rate using Pulse Sensor and Arduino
- Interfacing MAX30100 Pulse Oximeter and Heart Rate Sensor with Arduino
- Interfacing MAX30102 Pulse Oximeter and Heart Rate Sensor with Arduino
- Interface BMP180 Barometric Pressure & Temperature Sensor with Arduino
- Interface BME280 Temperature, Humidity & Pressure Sensor with Arduino
- Interface BME680 Environmental Sensor with Arduino
- Interfacing BMP388 Barometric Pressure Sensor (Altimeter) with Arduino
- Interfacing MS5611 Barometric Pressure Sensor with Arduino
- Interfacing TMP36 Temperature Sensor with Arduino
- Interface MLX90614 Non-contact Infrared Temperature Sensor with Arduino
- What is RFID? How It Works? Interface RC522 RFID Module with Arduino
- Interfacing TCS230/TCS3200 Color Sensor with Arduino
- How Accelerometer works? Interface ADXL335 with Arduino
- Interface MPU6050 Accelerometer and Gyroscope Sensor with Arduino
- Interfacing TFMini-S LiDAR Sensor with Arduino
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- Interface DS3231 Precision RTC Module with Arduino
- Interface One Channel Relay Module with Arduino
- Interface Two Channel Relay Module with Arduino
- Interface 4×3 & 4×4 Membrane Keypad with Arduino
- How Rotary Encoder Works and Interface It with Arduino
- How 74HC595 Shift Register Works & Interface it with Arduino
- How 2-Axis Joystick Works & Interface with Arduino + Processing
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Cyber Security
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Data Science
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DBaaS
- Database as a Service
DBReplication
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Django
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- Add Static Files
- Install WhiteNoise
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DS Database Table
- Data Science - Database Table
ESP32 Projects
- Getting Started with ESP32
- ESP32 vs. ESP8266: Which Microcontroller Is Right for You?
- ESP32 Pinout Reference
- ESP32-WROOM-32 Pinout Reference
- ESP32 Basics: Analog-to-digital Converter (ADC)
- ESP32 Basics: Hall Effect Sensor
- ESP32 Basics: Capacitive Touch Pins
- ESP32 Basics: Generating a PWM Signal on the ESP32
- Configuring & Handling ESP32 GPIO Interrupts In Arduino IDE
- Insight Into ESP32 Sleep Modes & Their Power Consumption
- ESP32 Deep Sleep & Its Wake-up Sources
- Create A Simple ESP32 Web Server In Arduino IDE
- How to Create an ESP32 Web Server with WebSockets in Arduino IDE
- ESP32 Basics: Bluetooth Classic
- ESP32 Basics: Bluetooth Low Energy (BLE)
- How to Build a CAN Bus With ESP32
- Create A Simple ESP32 Web Server In Arduino IDE
- Interface DHT11 DHT22 with ESP32 & Display Values Using Web Server
- Create A Simple ESP32 Weather Station With BME280
- Interface Multiple DS18B20s with ESP32 & Display Values Using Web Server
- Getting Started With ESP32-CAM
- ESP32-CAM Pinout Reference
- Control WS2812B Addressable LEDs with ESP32 and WLED
- Getting started with Sound Reactive WLED
- How to Find and Change the MAC Address on ESP32
- How to Solve �A Fatal Error Occurred: Failed to Connect to ESP32: Timed Out Waiting for Packet Header�
- How to set up mDNS on an ESP32
- How to set a Static or Fixed IP Address on your ESP32
- ESP32 Basic Over The Air (OTA) Programming In Arduino IDE
- ESP32 Web Updater Over The Air (OTA) Programming In Arduino IDE
- Getting Date & Time From NTP Server With ESP32
- Interface OLED Graphic Display Module with ESP32
ESP8266 Projects
- Getting Started with ESP8266
- Installing ESP8266 Board in the Arduino IDE
- ESP8266 Pinout Reference
- Create A Simple ESP8266 NodeMCU Web Server In Arduino IDE
- Configuring & Handling ESP8266 GPIO Interrupts In Arduino IDE
- 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
- Create A Simple ESP8266 Weather Station With BME280
Excel
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GIT
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GO
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HTML
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Example

Return the specified value IF the expression is NULL, otherwise return the expression:

SELECT IFNULL(NULL, "W3Schools.com");

Definition and Usage

The IFNULL() function returns a specified value if the expression is NULL.

If the expression is NOT NULL, this function returns the expression.

Syntax

IFNULL(expression, alt_value)

Parameter Values

Parameter	Description
expression	Required. The expression to test whether is NULL
alt_value	Required. The value to return if expression is NULL

Technical Details

Works in:	From MySQL 4.0

More Examples

Example

Return the specified value IF the expression is NULL, otherwise return the expression:

SELECT IFNULL("Hello", "W3Schools.com");

Example

Return the specified value IF the expression is NULL, otherwise return the expression:

SELECT IFNULL(NULL, 500);

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Frequently Ask

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