CODEWITHSUNDEEP
mysqlselectunionunion-all
Mohammad Masoudian
Mohammad Masoudian

Reputation: 3491

UNION multi select statement with defferent number of columns

how can i union these select statements that each table has different number of columns?

(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 ?)

i recieve this error : 

The used SELECT statements have a different number of columns

Upvotes: 0

Views: 86

Answers (2)

daxur
daxur

Reputation: 359

Simply use NULL value as placeholder for missing fields.

This should work:

(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 ?)

Upvotes: 1

Jerzy Zawadzki
Jerzy Zawadzki

Reputation: 1985

simply: you can't - you must add some blank columns (e.g. NULL as blank1) to those subqueries which have less than maximum # of columns

Upvotes: 1

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