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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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SQL COLUMN Keyword

ALTER COLUMN

The ALTER COLUMN command is used to change the data type of a column in a table.

The following SQL changes the data type of the column named "BirthDate" in the "Employees" table to type year:

Example

ALTER TABLE Employees
ALTER COLUMN BirthDate year;

DROP COLUMN

The DROP COLUMN command is used to delete a column in an existing table.

The following SQL deletes the "ContactName" column from the "Customers" table:

Example

ALTER TABLE Customers
DROP COLUMN ContactName;

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