Question 4 You are working with a database table that contains invoice data. The table includes columns for invoice_id and customer_id. You want to remove duplicate entries for customer ID and sort the results by invoice ID.  You write the SQL query below. Add a DISTINCT clause that will remove duplicate entries from the customer_id column.

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SQL Query

Structured Query Language is the full form of SQL. It is one of the standard languages to deal with the relational database. It is used to insert, update, delete, and search the records stored in a RDBMS. The relational databases are created and managed by using SQL.