Types of triggers. A trigger defines a set of actions that are performed in response to an insert, update, or delete operation on a specified table. When such an SQL operation is executed, the trigger is said to have been activated. Triggers are optional and are defined using the CREATE TRIGGER statement.

Types of Dreams Daydreams. You spend an average of 70-120 minutes a day, daydreaming or fantasizing from a perspective that transcends normal perception. ... Lucid Dreams. Lucid dreams occur when you 'wake up' while dreaming. ... Nightmares. ... Recurring Dreams. ... Dreams About Healing. ... Prophetic Dreams. ... Life Changing Dreams.

Sand types Coral sand“ Coral sand” has several meanings. Find out what it really is. Gypsum sand A rare sand type composed of gypsum grains. Ooid sand Ooids are rounded pellets formed in a shallow wave agitated water. Silica sand Silica sand is almost pure quartz. Black sand There are two types of black sand.

Here are six common parasomnias that afflict sleepers: Sleepwalking. More commonly seen in children, sleepwalking (also called somnambulism) affects about 4 percent of American adults. ... REM sleep behavior disorder. ... Nightmares. ... Night terrors. ... Nocturnal sleep-related eating disorder. ... Teeth grinding.

The most important sleep disorders are: Insomnia. Sleep apnea. Restless legs syndrome. Narcolepsy.

These types of disasters include: Tornadoes and Severe Storms. Hurricanes and Tropical Storms. Floods. Wildfires. Earthquakes. Drought.

A common way to classify hazards is by category:biological - bacteria, viruses, insects, plants, birds, animals, and humans, etc.,chemical - depends on the physical, chemical and toxic properties of the chemical,ergonomic - repetitive movements, improper set up of workstation, etc.,

Hurricanes and tropical storms. Landslides & debris flow. Thunderstorms and lighting. Tornadoes. Tsunamis. Wildfire. Winter and ice storms. Sinkholes.