第一个查询
(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%’)
第二个查询：
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.