-- (id, unique_id) is the primary key for this table. -- Each row of this table contains the id and the corresponding unique id of an employee in the company. -- Write an SQL query to show the unique ...

(id, unique_id) is the primary key (combination of columns with unique values) for this table. Each row of this table contains the id and the corresponding unique id of an employee in the company.

To support users analyzing unstructured text, this paper designs a set of SQL-like information extraction and unique topic query language for users to extract information and find out unique topics on ...