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。我想从使用NOT IN的查询中删除100个结果，tasks_task_id是数据库中的唯一索引，并且没有任何重复项。 我在AND NOT IN的声明如下：
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' )
结果是150而不是149，我无法弄清楚原因。我也尝试了AND！=并得到了相同的结果。有人可以解释一下原因吗？
答案 0 :(得分：2)
这可能是一个合乎逻辑的问题。在使用OR和AND时要注意，因为MySQL会像这样解释它们：
condition1
OR condition2
OR (condition3
AND condition4)
所以，尝试用括号将所有OR分组，因为它们都将像“一个条件”和“不在条件”。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' )
答案 1 :(得分：1)
AND的{{3}}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OR括在括号中：
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 ( ... )
答案 2 :(得分：1)
在组合不同的逻辑比较时，务必确保使用括号。例如，您想使用以下内容：
SELECT * FROM `table1`
WHERE (var1 LIKE '%foo%' OR var1 LIKE '%bar%' OR ...)
AND `tasks_task_id` NOT IN ('1762','1763','1764','1765','1766', ... )
operator precedence可能会在这里发挥作用。如果所有大多数task_ids来自'AND'之前的最后一个表，这可能是原因，因为SQL可以将您的查询视为如下：
SELECT * FROM `table1`
WHERE (var1 LIKE '%foo%' OR var1 LIKE '%bar%' (...)
OR (
var1 LIKE '%zzz' AND `tasks_task_id` NOT IN ('1762','1763','1764', ... )
) )