Sql 我需要使用哪个连接？
问题：我知道我需要使用两个表 我需要找到书名上有“运动”字样的书、杂志、传单Sql 我需要使用哪个连接？,sql,join,outer-join,Sql,Join,Outer Join,问题：我知道我需要使用两个表 我需要找到书名上有“运动”字样的书、杂志、传单 Example Table Library1: books, magazines etc,... title Example Table Library2: flyers, etc (THIS TABLE DOES NOT HAVE title column anywhere) Psuedocode：从标题为“%sport%”的两个表中选择书籍、杂志和传单； 我需要任何与“运动”相匹配的结果，并显示它是否是一本书、杂
Example Table Library1: books, magazines etc,... title
Example Table Library2: flyers, etc (THIS TABLE DOES NOT HAVE title column anywhere)
这个的语法是什么？都不是。你需要一个工会。例如：
select title, 'book' as product from books where title like '%sport%'
union all
select title, 'magazine' from magazines where title like '%sport%'
union all
select title, 'flyer' from flyers where title like '%sport%'
都不是。你需要一个工会。例如：
select title, 'book' as product from books where title like '%sport%'
union all
select title, 'magazine' from magazines where title like '%sport%'
union all
select title, 'flyer' from flyers where title like '%sport%'
都不是。你需要一个工会。例如：
select title, 'book' as product from books where title like '%sport%'
union all
select title, 'magazine' from magazines where title like '%sport%'
union all
select title, 'flyer' from flyers where title like '%sport%'
都不是。你需要一个工会。例如：
select title, 'book' as product from books where title like '%sport%'
union all
select title, 'magazine' from magazines where title like '%sport%'
union all
select title, 'flyer' from flyers where title like '%sport%'
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