Different between primary key and unique key?
One table may have more than one Unique Key Constraint
columns, but should have only one Primary Key Constraint
column. Unique key allow us NULL values where Primary key not allow us null values. ReactJs Top Hooks List
In today article we are going to show you some reactjs hooks which can help you to increase your reactjs knowledge. What is hooks? Hooks are a new addition in React 16.8. It allows you to use state and other React features without writing a class. Hooks are the functions which "hook into" React state and lifecycle features from function components. Following are some hooks which are most useful for you 1. useState Hook React useState() is a built in hooks or function which comes with React library. When you want to use “useState” you need to first import in your application using following code sample. useState() only work with functional components. This will not work with Class components in React. Visit original article here 2. useEffect Hook The useEffect() hook allows us to run side effects on your functional components. Side effects is a general concept about how functions behave which are not predictable. A function is supposed to have side effe...
