SQLite的多个条件

Question

假设我有以下名为“fruits”的表，其字段为“FRUIT”，“STATUS”和“DATE”

FRUIT       STATUS      DATE
----------  ----------  ----------
apple       ADDED       2017-07-01
orange      ADDED       2017-07-03
peach       ADDED       2017-07-03
apple       REMOVED     2017-07-14
pear        ADDED       2017-07-11
peach       REMOVED     2017-07-15

如何查询已经“添加”和“删除”的所有水果？

Answer 1

您需要自我加入：

SELECT DISTINCT added.FRUIT
FROM fruits AS added
INNER JOIN fruits AS removed
  ON added.FRUIT=removed.FRUIT
WHERE added.STATUS="ADDED"
AND removed.STATUS="REMOVED"

这将找到所有行，它们共享fruite并具有正确的状态。

SQLfiddle