<prompt> Kuandika SQL query kuchagua wateja ambao wamejiunga ndani ya siku 7 zilizopita.  <response>: Here is an SQL query that you can use to select customers who have signed up within the last 7 days:SQLSELECT FROM customersWHERE signup_date DATEADDday, -7, GETDATE This query assumes that you have a table named customers with a column named signup_date that stores the date when the customer signed up. The DATEADD function is used to calculate the date that was 7 days ago, and then the query selects all customers whose signup_date is greater than or equal to that date. 