sql喜欢看起来不像我认为应该
我有一个精选的语句,剩下的加入大量,我想过滤一些。
当我检查总共有多少记录并用我的类似语句减去记录时,我应该得到不受限制影响的金额。
但是,当我否定自己的限制以获得我没有影响的限制时,我的数字与计算的数字不同。
SQL无限制(记录计数:13.251.981)
SELECT p.product_number
FROM product p
LEFT JOIN product_category pc on p.id = pc.product_id
LEFT JOIN product_category_tree pct on p.id = pct.product_id
LEFT JOIN product_configurator_setting pcs on p.id = pcs.product_id
LEFT JOIN product_cross_selling pcs2 on p.id = pcs2.product_id
LEFT JOIN product_cross_selling_assigned_products pcsap on p.id = pcsap.product_id
LEFT JOIN product_cross_selling_translation pcst on pcs2.id = pcst.product_cross_selling_id
LEFT JOIN product_custom_field_set pcfs on p.id = pcfs.product_id
LEFT JOIN product_media pm on p.id = pm.product_id
LEFT JOIN product_option po on p.id = po.product_id
LEFT JOIN product_price pp on p.id = pp.product_id
LEFT JOIN product_property pp2 on p.id = pp2.product_id
LEFT JOIN product_review pr on p.id = pr.product_id
LEFT JOIN product_search_keyword psk on p.id = psk.product_id
LEFT JOIN product_tag pt on p.id = pt.product_id
LEFT JOIN product_translation pt2 on p.id = pt2.product_id
LEFT JOIN product_visibility pv on p.id = pv.product_id
具有限制性(记录计数:9.285.545),
WHERE p.product_number NOT LIKE 'SW%'
AND p.product_number NOT LIKE '%.%'
AND pt2.name NOT LIKE '%Gutschein'
AND pt2.name NOT LIKE '%Test%'
并从我的计算中被否定的限制(记录计数:100.851)
WHERE p.product_number LIKE 'SW%'
OR p.product_number LIKE '%.%'
OR pt2.name LIKE '%Gutschein'
OR pt2.name LIKE '%Test%';
,我应该获得3.966.436记录,而不会受到影响。 (13.251.981-9.285.545 = 3.966.436)
但是我得到了100.851,
这是怎么可能的?
I have an SELECT statement that has a huge number of left join and I want to filter some out.
When I check how many records i have in total and subtract the records with my LIKE statements, I should get the amount that is not affected by my restrictions.
But when I negate my restriction to get the ones I didn't affect, I get an different number than calculated.
SQL without restrictions (Record count: 13.251.981)
SELECT p.product_number
FROM product p
LEFT JOIN product_category pc on p.id = pc.product_id
LEFT JOIN product_category_tree pct on p.id = pct.product_id
LEFT JOIN product_configurator_setting pcs on p.id = pcs.product_id
LEFT JOIN product_cross_selling pcs2 on p.id = pcs2.product_id
LEFT JOIN product_cross_selling_assigned_products pcsap on p.id = pcsap.product_id
LEFT JOIN product_cross_selling_translation pcst on pcs2.id = pcst.product_cross_selling_id
LEFT JOIN product_custom_field_set pcfs on p.id = pcfs.product_id
LEFT JOIN product_media pm on p.id = pm.product_id
LEFT JOIN product_option po on p.id = po.product_id
LEFT JOIN product_price pp on p.id = pp.product_id
LEFT JOIN product_property pp2 on p.id = pp2.product_id
LEFT JOIN product_review pr on p.id = pr.product_id
LEFT JOIN product_search_keyword psk on p.id = psk.product_id
LEFT JOIN product_tag pt on p.id = pt.product_id
LEFT JOIN product_translation pt2 on p.id = pt2.product_id
LEFT JOIN product_visibility pv on p.id = pv.product_id
With restriction (Record count: 9.285.545)
WHERE p.product_number NOT LIKE 'SW%'
AND p.product_number NOT LIKE '%.%'
AND pt2.name NOT LIKE '%Gutschein'
AND pt2.name NOT LIKE '%Test%'
With negated restriction (Record count: 100.851)
WHERE p.product_number LIKE 'SW%'
OR p.product_number LIKE '%.%'
OR pt2.name LIKE '%Gutschein'
OR pt2.name LIKE '%Test%';
From my calculations i should get 3.966.436 records that don't get affected. (13.251.981 - 9.285.545 = 3.966.436)
But instead I get 100.851
How is that possible?
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对我来说,解决方案实际上是:
其中p.product_number< 'SW'
The solution for me was actually this WHERE:
WHERE p.product_number < 'SW'