第一次查询
(SELECT a.cat_id,
a.cat_name,
a.cat_description,
b.subcat_name,
b.subcat_description
FROM trade_categories a
LEFT JOIN trade_subcategories b ON a.cat_id = b.cat_id
WHERE a.cat_name LIKE '%catty%'
OR a.cat_description LIKE '%catty%')
UNION
(SELECT c.cat_id,
d.cat_name,
d.cat_description,
c.subcat_name,
c.subcat_description
FROM trade_subcategories c
LEFT JOIN trade_categories d ON c.cat_id = d.cat_id
WHERE c.subcat_name LIKE '%catty%'
OR c.subcat_description LIKE '%catty%')
第二次查询:
SELECT x.cat_id,
x.cat_name,
x.cat_description,
y.subcat_name,
y.subcat_description
FROM trade_categories x
JOIN trade_subcategories y ON x.cat_id = y.cat_id
WHERE ( x.cat_name LIKE '%catty%'
OR x.cat_description LIKE '%catty%' )
AND ( y.subcat_name NOT LIKE '%catty%'
OR y.subcat_description NOT LIKE '%catty%' )
我想从第一个查询结果中减去第二个查询结果。
答案 0 :(得分:11)
http://www.bitbybit.dk/carsten/blog/?p=71
或 例如:
SELECT Name FROM employee1 WHERE name NOT IN (SELECT name FROM employee2);
答案 1 :(得分:1)
我认为你可以做一个NOT IN或LEFT JOIN。我更喜欢LEFT JOIN。
例如,
SELECT `QUERY_ONE`.*
FROM `QUERY_ONE`
LEFT JOIN `QUERY_TWO` USING (`cat_id`)
WHERE QUERY_TWO.cat_id IS NULL;
其中QUERY_ONE和QUERY_TWO是两个查询的别名
答案 2 :(得分:0)
SELECT a.cat_id,
a.cat_name,
a.cat_description,
b.subcat_name,
b.subcat_description
FROM trade_categories a
LEFT JOIN trade_subcategories b ON a.cat_id = b.cat_id
WHERE a.cat_name NOT LIKE '%catty%'
AND a.cat_description NOT LIKE '%catty%'
AND (b.cat_id IS NULL
OR b.subcat_name NOT LIKE '%catty%' AND b.subcat_description NOT LIKE '%catty%')
或者,如果两个查询的结果已存储在(临时)表中,您可以使用@Abhay的解决方案。