A query is a request for data or information from a database table or combination of tables. This query can be thought of as providing a "view" of the database, which means it presents a specific slice or interpretation of the database data according to the query's conditions and structure. Queries that view the database contents use the keyword.
The simplest form of SELECT query uses the * wildcard operator to retrieve all database from the table. If you only want to retrieve data from certain columns then you can specify the column data that you wish to retrieve. An example SQL SELECT query that retrieves all columns for all customers in the table is: SELECT * FROM Customers; Queries can filter data based on specific criteria, showing only the data that meets these conditions.
The clause in SQL is used to sort the result set of a query by one or more columns. It can sort the data in ascending order (which is the default) or descending order based on the specified column(s). The LIKE operator in SQL is used in a WHERE clause to search for a specified pattern in a column, making it useful when performing searches on strings. For example, to retrieve all rows from Employees where the Name starts with 'J', you would use the query: SELECT * FROM Employees WHERE Name LIKE '';
