Oracle 12c-根据不同表中的值动态生成where子句

Question

I am trying to write an Oracle 12c SQL statement like this:

select * from table1 where col1 in (*dynamicvalue*)

I want the dynamic value to be the result of the following SQL:

select col2 from table2 where rowid = 1

Is this possible? Col2 contains a list of values like this: 'val1','val2','val3'

Thank you

Answer 1

Instead of dynamic-sql, you can split the string and perform the query. To split the string use regexp_substr .

select * from table1 
where col1 in (select regexp_substr(col2,'[^,]+', 1, level)  
               from table2
               connect by regexp_substr(col2, '[^,]+', 1, level) is not null)

Answer 2

Why not just do this?

select t1.*
from table1 t1
where t1.col1 in (select col2 from table2 where rowid = 1);

EDIT:

Storing lists of values in a single column is such a bad idea that I interpreted the question incorrectly. I took the "list of values" to be the values stored in different rows. Why? Because that is the right way to store the data. It is not SQLish to store lists of columns in a delimited list.

That said, we are sometimes stuck with other people's really bad design decisions. You can use a query such as this, if you are in this situation:

select t1.*
from table1 t1
where exists (select 1
              from table2 t2
              where rowid = 1 and
                    ',' || t2.col2 || ',' like '%,' || t1.col1 || ',%'
             );