Question

I am using SQLite,

TABLE A
(
 ID
 FileNAME
 FOLDERID
)

TABLE B
(
 FOLDERID
 FOLDERPATH
)

I want to write a SQL statement to delete all files in A where its Folder is subfolder of C:\ABC\;

How can I make it in one SQLite statement, and is it the best way to do?

Many thanks!

Answer 1

the following works fine:

create table table_a (

   id int,
   file_name varchar(300),
   folder_id int
);

create table table_b (
 folder_id int,
 folder_path varchar(300)
);

insert into table_a (id, file_name, folder_id) values (1, 'file1.txt', 1);
insert into table_a (id, file_name, folder_id) values (1, 'file2.txt', 1);
insert into table_a (id, file_name, folder_id) values (1, 'file2-1.txt', 2);
insert into table_b (folder_id, folder_path) values (1, 'c:\abc\somefolder\another');
insert into table_b (folder_id, folder_path) values (2, 'c:\abcNOT\somefolder\another');

delete
from table_a
where folder_id in (select folder_id from table_b where substr(folder_path, 1, 7) = 'c:\abc\');

select * from table_a;