每天看新聞的來源很多,Line打開就有line today,google新聞打開就有各家媒體平台的報導,但看來看去有沒有發現報導的內容都千篇一律,這次要介紹3個我每天都會瀏覽的新聞網站!!
題目:
The Employee table holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id.
Employee
+----+-------+--------+…
給一個world table,用兩個條件,篩選area 跟 population。
There is a table World
World
+-----------------+------------+------------+--------------+---------------+| name | continent | area |…
DELETE 相同的Email,留下小的Id。
Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id.
Person
+----+-------+| Id | Score |+----+-------+| 1 | 3.50 || 2 | 3.65 || 3 | 4.00 || 4 | 3.85 || 5 | 4.00 || 6 | 3.65 |+----+-------+
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