这个sql怎么了？

Question

select id from dm_unit where aa like '%'||?||'%'  

Answer 1

内引号需要转义吗？

select id from dm_unit where aa like '%\'||?||\'%'

Answer 2

您需要转义内部单引号，这可以通过将它们加倍来完成：

select id from dm_unit where aa like '%''||?||''%'  

Answer 3

I assume you use the ? as a placeholder. If this is the case, the query should read select id from dm_unit where aa like ? and the placeholder's value should later on be bound to something like '%foobar%' .

Answer 4

I think you wrote \\' in your query to use single quote in your query. but its not a right way. to use single quote in our query use '' (2 single quote) instead of ' (1 single quote)

Answer 5

抱歉，我没有给出答案，我只想了解为什么不使用： LIKE '%?%'