Mysql 列数不同的UNION multi select语句

如何合并每个表具有不同列数的select语句

(SELECT title, description, full_description, keywords, option1, option2, option3, option4, option5, option6, option7, option8 FROM articles WHERE title LIKE ? OR description LIKE ? OR full_description LIKE ? OR keywords LIKE ? OR option1 LIKE ? OR option2 LIKE ? OR option3 LIKE ? OR option4 LIKE ? OR option5 LIKE ? OR option6 LIKE ? OR option7 LIKE ? OR option8 LIKE ?) 
UNION ALL 
(SELECT title, description, full_description, keywords, option1, option2, option3, option4, option5, option6, option7, option8 FROM news WHERE title LIKE ? OR description LIKE ? OR full_description LIKE ? OR keywords LIKE ? OR option1 LIKE ? OR option2 LIKE ? OR option3 LIKE ? OR option4 LIKE ? OR option5 LIKE ? OR option6 LIKE ? OR option7 LIKE ? OR option8 LIKE ?) 
UNION ALL 
(SELECT title, description, full_description, keywords, option1, option2, option3, option4, option5, option6, option7, option8 FROM products WHERE title LIKE ? OR description LIKE ? OR full_description LIKE ? OR keywords LIKE ? OR option1 LIKE ? OR option2 LIKE ? OR option3 LIKE ? OR option4 LIKE ? OR option5 LIKE ? OR option6 LIKE ? OR option7 LIKE ? OR option8 LIKE ?) 
UNION ALL 
(SELECT title, description, option1, option2, option3, option4, option5, option6, option7, option8 FROM gallery_images WHERE title LIKE ? OR description LIKE ? OR option1 LIKE ? OR option2 LIKE ? OR option3 LIKE ? OR option4 LIKE ? OR option5 LIKE ? OR option6 LIKE ? OR option7 LIKE ? OR option8 LIKE ?) 
UNION ALL 
(SELECT title, description, option1, option2, option3, option4, option5, option6, option7, option8 FROM pages WHERE title LIKE ? OR description LIKE ? OR option1 LIKE ? OR option2 LIKE ? OR option3 LIKE ? OR option4 LIKE ? OR option5 LIKE ? OR option6 LIKE ? OR option7 LIKE ? OR option8 LIKE ?)

我收到这个错误：

The used SELECT statements have a different number of columns

---

简单地说：您不能-您必须向那些列数小于最大值的子查询添加一些空白列（例如，

NULL as blank1

），只需使用空值作为缺少字段的占位符

这应该起作用：

(SELECT title, description, full_description, keywords, option1, option2, option3, option4, option5, option6, option7, option8 FROM articles WHERE title LIKE ? OR description LIKE ? OR full_description LIKE ? OR keywords LIKE ? OR option1 LIKE ? OR option2 LIKE ? OR option3 LIKE ? OR option4 LIKE ? OR option5 LIKE ? OR option6 LIKE ? OR option7 LIKE ? OR option8 LIKE ?) 
UNION ALL 
(SELECT title, description, full_description, keywords, option1, option2, option3, option4, option5, option6, option7, option8 FROM news WHERE title LIKE ? OR description LIKE ? OR full_description LIKE ? OR keywords LIKE ? OR option1 LIKE ? OR option2 LIKE ? OR option3 LIKE ? OR option4 LIKE ? OR option5 LIKE ? OR option6 LIKE ? OR option7 LIKE ? OR option8 LIKE ?) 
UNION ALL 
(SELECT title, description, full_description, keywords, option1, option2, option3, option4, option5, option6, option7, option8 FROM products WHERE title LIKE ? OR description LIKE ? OR full_description LIKE ? OR keywords LIKE ? OR option1 LIKE ? OR option2 LIKE ? OR option3 LIKE ? OR option4 LIKE ? OR option5 LIKE ? OR option6 LIKE ? OR option7 LIKE ? OR option8 LIKE ?) 
UNION ALL 
(SELECT title, description, NULL AS full_description, NULL AS keywords, option1, option2, option3, option4, option5, option6, option7, option8 FROM gallery_images WHERE title LIKE ? OR description LIKE ? OR option1 LIKE ? OR option2 LIKE ? OR option3 LIKE ? OR option4 LIKE ? OR option5 LIKE ? OR option6 LIKE ? OR option7 LIKE ? OR option8 LIKE ?) 
UNION ALL 
(SELECT title, description, NULL AS full_description, NULL AS keywords, option1, option2, option3, option4, option5, option6, option7, option8 FROM pages WHERE title LIKE ? OR description LIKE ? OR option1 LIKE ? OR option2 LIKE ? OR option3 LIKE ? OR option4 LIKE ? OR option5 LIKE ? OR option6 LIKE ? OR option7 LIKE ? OR option8 LIKE ?)