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子查询

更新时间:2018-12-02 19:18:44

以下示例在WHERE子句中包含一个表子查询,该子查询生成多个行。在本示例中,行只包含一列,但表子查询可以包含多个列和行,就像任何其他表一样。

以下查询查找门票销量排名前10位的卖家。

  1. select firstname, lastname, cityname, max(qtysold) as maxsold
  2. from users join sales on users.userid=sales.sellerid
  3. where users.city not in(select venuecity from venue)
  4. group by firstname, lastname, city
  5. order by maxsold desc, city desc
  6. limit 10;
  7. firstname | lastname | cityname | maxsold
  8. -----------+----------+----------------+---------
  9. Noah | Guerrero | Worcester | 8
  10. Isadora | Moss | Winooski | 8
  11. Kieran | Harrison | Westminster | 8
  12. Heidi | Davis | Warwick | 8
  13. Sara | Anthony | Waco | 8
  14. Bree | Buck | Valdez | 8
  15. Evangeline | Sampson | Trenton | 8
  16. Kendall | Keith | Stillwater | 8
  17. Bertha | Bishop | Stevens Point | 8
  18. Patricia | Anderson | South Portland | 8
  19. (10 rows)