sql中的where子句具有基于优先级的多个条件SQL BigQuery答案

【问题标题】：where clause in sql with multiple conditions based on priorities SQL BigQuerysql中的where子句具有基于优先级的多个条件SQL BigQuery
【发布时间】：2020-12-23 19:44:22
【问题描述】：

我有两个要在 BigQuery 中合并的表。我需要根据多个条件过滤数据。我需要返回 url = https://www.mywebpage%、duration = 15000 的所有字段，第三个条件应该获取 action = Midpoint 或 action = Complete。下面是代码：

SELECT
    d.duration,
    c.action,
    c.url
FROM
    (
        `table_action_url` c
        INNER JOIN `table_duration` d ON (d.id = c.id)
    )
WHERE c.url LIKE "https://www.mywebpage%" 
AND d.duration = '15000' 
AND c.action like 'Midpoint' 
OR (c.action like 'Complete')

这将返回持续时间和 url 的不同字段，但正确的操作。我还尝试了以下方法：

SELECT
    d.duration,
    c.action,
    c.url
FROM
    (
        `table_action_url` c
        INNER JOIN `table_duration` d ON (d.id = c.id)
    )
WHERE (c.url LIKE "https://www.mywebpage%" AND d.duration = '15000' AND c.action like 'Midpoint')
OR (c.url LIKE "https://www.mywebpage%" AND d.duration = '15000' AND c.action like 'Complete')

此查询返回正确的 url 和持续时间，但对于操作，值都是完整的。期望的输出是：

duration      action      url 
15000        Midpoint     https://www.mywebpage
15000        Complete     https://www.mywebpage
15000        Midpoint     https://www.mywebpage

【问题讨论】：

标签： mysql sql filter google-bigquery where-clause

【解决方案1】：

你需要括号。不在FROM 子句中。在WHERE 子句中：

FROM `table_action_url` c JOIN
     `table_duration` d
      ON d.id = c.id
WHERE c.url LIKE 'https://www.mywebpage%' AND
      d.duration = '15000' AND
     (c.action LIKE 'Midpoint' OR c.action LIKE 'Complete')

在您的特定情况下，您可以将LIKE 替换为IN：

WHERE c.url LIKE 'https://www.mywebpage%' AND
      d.duration = '15000' AND
      c.action IN ('Midpoint', 'Complete')

但如果您想要通配符匹配，请改用regexp_contains()：

WHERE c.url LIKE 'https://www.mywebpage%' AND
      d.duration = '15000' AND
      REGEXP_CONTAINS(c.action, '^(Midpoint|Complete)$'

【讨论】：

【解决方案2】：

AND 在OR 之前...

你有：

WHERE (c.url LIKE "https://www.mywebpage%" 
       AND d.duration = '15000' 
       AND c.action like 'Midpoint')
OR (c.action like 'Complete')

但你想要：

WHERE c.url LIKE "https://www.mywebpage%" 
AND d.duration = '15000' 
AND c.action in ('Midpoint', 'Complete')

【讨论】：