Question

我有一个名为WORKOUTS的表，其列名为＆＃34; install_time＆＃34;和＆＃34; local_id＆＃34;。两者都有列类型整数。它们是唯一的密钥。我写了两个如下的查询：

SELECT * from workouts where install_time = 123456 and local_id > 5

SELECT * from workouts where install_time = 987643 and local_id > 19

现在我想结合这些查询和一个where子句来处理这个条件，但是找不到办法。

修改

SELECT * from workouts where install_time = 123456 and local_id > 5 and date = xyz
SELECT * from workouts where install_time = 987643 and local_id > 19 and date = xyz

Answer 1

SELECT * 
FROM workouts 
WHERE 
    (install_time = 123456 AND local_id > 5 AND date = xyz)
    OR 
    (install_time = 987643 AND local_id > 19 AND date = xyz)

使用OR关键字时也要小心。你必须小心地放置括号。

以下是有关主题http://www.w3schools.com/sql/sql_and_or.asp

的更多信息

SELECT * 
FROM workouts 
WHERE 
    date = xyz
    AND (
      (install_time = 123456 AND local_id > 5)
      OR 
      (install_time = 987643 AND local_id > 19)
    )

Answer 2

SELECT * from workouts where install_time = 123456 and local_id > 5 and date = xyz
Union
SELECT * from workouts where install_time = 987643 and local_id > 19 and date = xyz

Answer 3

这取决于你的意思＆＃34;结合这两个查询＆＃34; 。如果您想要一个返回上述查询结果的结果集，您可以尝试使用OR运算符。以下假设date的{{1}}字段相同。

local_id

Answer 4

可以简单地完成

SELECT * from workout where date=xyz and (install_time = 123456 and local_id > 5) or (install_time = 987643  and local_id> 19)

组合来自同一个表但不同WHERE子句的两个SELECT查询

4 个答案: