错误：使用低效的连接可能会降低性能，尤其是在连接之前未正确过滤数据的情况下。 假设我们有另一个表Departments。 SELECT * FROM Employees JOIN Departments ON Employees.Department = Departments.Department; 这个查询连接了所有行，即使我们并不需要所有数据。 解决方案 ...

LANZHOU, Sept. 23 (Xinhua) -- China's Dunhuang Academy, a comprehensive national institution for the conservation, management ...

The Japanese government unilaterally started the discharge of nuclear-contaminated water from the Fukushima Daiichi Nuclear ...

体育圈招聘 曼城足球俱乐部 关于城市足球集团：城市足球集团（City Football Group）成立于2013年，是世界领先的足球管理和运营者，集团业务涵盖足球俱乐部运营、青训学院、技术支持、体育营销等多个领域。 我们致力于在全球视角下推动足球产业的可持续发展 ...

BEIJING, Sept. 21 (Xinhua) -- There is some good news for farmers in Yinjiayuan, a village in Jiangsu Province, east China.

Strong winds and scattered showers are predicted to hit Shanghai from tonight to tomorrow as Typhoon Pulasan approaches the ...

Subhinur Mutalip was born in Hotan City, China's Xinjiang. The 32-year-old Zumba instructor runs her gym in her hometown, where more and more local women are finding joy and rediscovering themselves ...

BEIRUT, Sept. 17 (Xinhua) -- Eight people were killed, and over 2,800 others, including Hezbollah members, were wounded on Tuesday in different areas of Lebanon as their pagers exploded, said Lebanese ...