What is: Query
A Query is made to access data from a database. Or when you ask for some particular data from a set of data. The function of selecting, inserting, deleting and manipulating data from databases is also known as Query. The query gives meaning to the code that is used in any language.
Whether it is SQL or any other thing, the user and the database can exchange the information if they have the same language. One of the several languages that can be used to perform complex database queries. Likewise, SQL is the most popular query language. SQL represent the most common standard language that is used. The query language generates various data types according to the function.
When you look for something on a WordPress web page or simply reading a blog, each time a query is being sent to the WordPress database to fetch the data. Also when a user creates, edits or deletes any data in a WordPress website then database queries run in the background to get the data from the database. The database is important in data storage capability. A person who does not have much knowledge about the specific language may need a database. The user can also choose the default menu that will further guide them through the search or the menu.
The Query language is what helps us take an action on the database. As a result, the user can read, edit, add, delete items on the database. Besides, also use advanced queries like filtering and counting.
In WordPress, WP_Query is a class to make custom queries.
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