-1

如果我运行查询：

SELECT *
FROM   mag2
WHERE  environments_env_id LIKE '%test%'
        OR environments_env_id LIKE '%test%'
        OR environments_env_type LIKE '%test%'
        OR environments_host_label LIKE '%test%'
        OR environments_host_type LIKE '%test%'
        OR environments_local_id LIKE '%test%'
        OR samples_date_added LIKE '%test%'
        OR samples_description LIKE '%test%'
        OR samples_exec_arguments LIKE '%test%'
        OR samples_label LIKE '%test%'
        OR samples_owner LIKE '%test%'
        OR samples_sample_id LIKE '%test%'
        OR samples_sample_type LIKE '%test%'
        OR samples_source LIKE '%test%'
        OR task_state_state LIKE '%test%'
        OR task_state_state_id LIKE '%test%'
        OR tasks_env_id LIKE '%test%'
        OR tasks_env_return_code LIKE '%test%'
        OR tasks_env_runtime LIKE '%test%'
        OR tasks_env_start LIKE '%test%'
        OR tasks_exec_arguments LIKE '%test%'
        OR tasks_global_risk_score LIKE '%test%'
        OR tasks_owner_risk_score LIKE '%test%'
        OR tasks_sample_id LIKE '%test%'
        OR tasks_state_id LIKE '%test%'
        OR tasks_task_id LIKE '%test%'
        OR tasks_task_start LIKE '%test%'
        OR event LIKE '%test%'

我得到 249 的结果。我想使用 NOT IN 和 tasks_task_id 从查询中消除 100 个结果，task_task_id 是数据库上的唯一索引并且没有任何重复项。我的 AND NOT IN 声明如下：

SELECT *
FROM   mag2
WHERE  environments_env_id LIKE '%test%'
        OR environments_env_id LIKE '%test%'
        OR environments_env_type LIKE '%test%'
        OR environments_host_label LIKE '%test%'
        OR environments_host_type LIKE '%test%'
        OR environments_local_id LIKE '%test%'
        OR samples_date_added LIKE '%test%'
        OR samples_description LIKE '%test%'
        OR samples_exec_arguments LIKE '%test%'
        OR samples_label LIKE '%test%'
        OR samples_owner LIKE '%test%'
        OR samples_sample_id LIKE '%test%'
        OR samples_sample_type LIKE '%test%'
        OR samples_source LIKE '%test%'
        OR task_state_state LIKE '%test%'
        OR task_state_state_id LIKE '%test%'
        OR tasks_env_id LIKE '%test%'
        OR tasks_env_return_code LIKE '%test%'
        OR tasks_env_runtime LIKE '%test%'
        OR tasks_env_start LIKE '%test%'
        OR tasks_exec_arguments LIKE '%test%'
        OR tasks_global_risk_score LIKE '%test%'
        OR tasks_owner_risk_score LIKE '%test%'
        OR tasks_sample_id LIKE '%test%'
        OR tasks_state_id LIKE '%test%'
        OR tasks_task_id LIKE '%test%'
        OR tasks_task_start LIKE '%test%'
        OR event LIKE '%test%'
           AND `tasks_task_id` NOT IN ( '1762', '1763', '1764', '1765',
                                        '1766', '1779', '1787', '1836',
                                        '1837', '1838', '1839', '1840',
                                        '1841', '1850', '1852', '1856',
                                        '1893', '1914', '1927', '1946',
                                        '1955', '1957', '1969', '1985',
                                        '1986', '2016', '2026', '2038',
                                        '2063', '2098', '2110', '2133',
                                        '2136', '2148', '5056', '5066',
                                        '5068', '5070', '5084', '5106',
                                        '5120', '5132', '5136', '5146',
                                        '5150', '5152', '539', '546',
                                        '547', '548', '549', '550',
                                        '551', '557', '563', '565',
                                        '587', '589', '590', '594',
                                        '602', '603', '621', '622',
                                        '623', '624', '625', '626',
                                        '627', '637', '640', '642',
                                        '643', '645', '646', '648',
                                        '650', '651', '656', '657',
                                        '658', '662', '663', '664',
                                        '665', '671', '672', '675',
                                        '676', '677', '687', '688',
                                        '691', '693', '695', '699',
                                        '701', '702', '756', '762' )

它产生的结果是 150 而不是 149，我不知道为什么。我也尝试了 AND != 并得到了相同的结果。有人可以解释为什么吗？

4

3 回答 3

2

这可能是一个逻辑问题。OR一起使用时要注意AND，因为 MySQL 会这样解释它们：

condition1
OR condition2
OR (condition3
    AND condition4)

因此，尝试将所有ORs 用括号分组，因为它们都将像“一个条件”和“没有条件”。像这样：

WHERE
(
    condition1
    OR condition2
    OR condition3
)
AND NOT IN (1, 2, 3)

所以你的查询应该是

SELECT *
FROM   mag2
WHERE  
    ( 
          environments_env_id LIKE '%test%'
          OR environments_env_id LIKE '%test%'
          OR environments_env_type LIKE '%test%'
          OR environments_host_label LIKE '%test%'
          OR environments_host_type LIKE '%test%'
          OR environments_local_id LIKE '%test%'
          OR samples_date_added LIKE '%test%'
          OR samples_description LIKE '%test%'
          OR samples_exec_arguments LIKE '%test%'
          OR samples_label LIKE '%test%'
          OR samples_owner LIKE '%test%'
          OR samples_sample_id LIKE '%test%'
          OR samples_sample_type LIKE '%test%'
          OR samples_source LIKE '%test%'
          OR task_state_state LIKE '%test%'
          OR task_state_state_id LIKE '%test%'
          OR tasks_env_id LIKE '%test%'
          OR tasks_env_return_code LIKE '%test%'
          OR tasks_env_runtime LIKE '%test%'
          OR tasks_env_start LIKE '%test%'
          OR tasks_exec_arguments LIKE '%test%'
          OR tasks_global_risk_score LIKE '%test%'
          OR tasks_owner_risk_score LIKE '%test%'
          OR tasks_sample_id LIKE '%test%'
          OR tasks_state_id LIKE '%test%'
          OR tasks_task_id LIKE '%test%'
          OR tasks_task_start LIKE '%test%'
          OR event LIKE '%test%' 
       )
       AND `tasks_task_id` NOT IN ( '1762', '1763', '1764', '1765',
                                    '1766', '1779', '1787', '1836',
                                    '1837', '1838', '1839', '1840',
                                    '1841', '1850', '1852', '1856',
                                    '1893', '1914', '1927', '1946',
                                    '1955', '1957', '1969', '1985',
                                    '1986', '2016', '2026', '2038',
                                    '2063', '2098', '2110', '2133',
                                    '2136', '2148', '5056', '5066',
                                    '5068', '5070', '5084', '5106',
                                    '5120', '5132', '5136', '5146',
                                    '5150', '5152', '539', '546',
                                    '547', '548', '549', '550',
                                    '551', '557', '563', '565',
                                    '587', '589', '590', '594',
                                    '602', '603', '621', '622',
                                    '623', '624', '625', '626',
                                    '627', '637', '640', '642',
                                    '643', '645', '646', '648',
                                    '650', '651', '656', '657',
                                    '658', '662', '663', '664',
                                    '665', '671', '672', '675',
                                    '676', '677', '687', '688',
                                    '691', '693', '695', '699',
                                    '701', '702', '756', '762' )
于 2013-09-12T20:05:25.777 回答
1

AND优先级高于，OR因此您的查询实际上是：

(..)
    OR tasks_task_start LIKE '%test%'
    OR ( event LIKE '%test%'
       AND `tasks_task_id` NOT IN ( ... ))

将所有ORs 放在括号中：

SELECT *
FROM   mag2
WHERE ( environments_env_id LIKE '%test%'
        OR environments_env_id LIKE '%test%'
        OR environments_env_type LIKE '%test%'
    (...)
        OR tasks_task_start LIKE '%test%'
        OR event LIKE '%test%' )
           AND `tasks_task_id` NOT IN ( ... )
于 2013-09-12T20:02:54.880 回答
1

在组合不同的逻辑比较时，请务必使用括号。例如，您想使用类似的东西：

SELECT * FROM `table1` 
WHERE (var1 LIKE '%foo%' OR var1 LIKE '%bar%' OR ...) 
AND `tasks_task_id` NOT IN ('1762','1763','1764','1765','1766', ... )

运算符优先级可能在这里发挥作用。如果所有大多数 task_id 都来自“AND”之前的最后一个表，这可能是原因，因为 SQL 可以像这样对待您的查询：

SELECT * FROM `table1` 
WHERE (var1 LIKE '%foo%' OR var1 LIKE '%bar%' (...) 
OR (
var1 LIKE '%zzz' AND `tasks_task_id` NOT IN ('1762','1763','1764', ... )
) )
于 2013-09-12T20:02:56.033 回答