Overcoming ambiguous field error in SQL query

Question

I have 4 tables and this query

SELECT tag.id, title
FROM tag
LEFT JOIN tag_map ON ( tag.id = tag_map.tag_id ) 
LEFT JOIN post ON ( post.id = post_id ) 
LEFT JOIN         


        

Answer 1

You need to specify which table you want title to come from. Taking a guess that title will be in game you would need to specify game.title.

If I were you I'd start looking into splitting this down a bit using temporary tables. Although theres nothing wrong with 4 joins it does tend to start getting confusing.

Example temp table:

CREATE TABLE #Yaks (
YakID int,
YakName char(30) )

In your scenario you would create a temp table and then fill it with an INSERT and UPDATE based on individual joins so at the end all you have to do is SELECT * FROM @temptable