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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 CREATE UNIQUE INDEX Keyword

CREATE UNIQUE INDEX

The CREATE UNIQUE INDEX command creates a unique index on a table (no duplicate values allowed)

Indexes are used to retrieve data from the database very fast. The users cannot see the indexes, they are just used to speed up searches/queries.

The following SQL creates an index named "uidx_pid" on the "PersonID" column in the "Persons" table:

CREATE UNIQUE INDEX uidx_pid
ON Persons (PersonID);

Note: The syntax for creating indexes varies among different databases. Therefore: Check the syntax for creating indexes in your database.

Note: Updating a table with indexes takes more time than updating a table without (because the indexes also need an update). So, only create indexes on columns that will be frequently searched against.

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