MySQL通过单个单元格中的多个ID加入查询

Question

i have following data (sample) for template table

TempName, ItemID
Test1, 1/5/6/8/11
Test2, 2/4/5/8/10

So, i like to make a sql query that will join with Item Tables And Return All the rows of data that matched/exists in ItemID Field

Something like: Select * From Items Inner Join Template On Items.ID = Template.ItemID Where Template Name = 'Test1';

i can't figure correct sql query so, now i am using a for loop and but i prefer one liner or better query/script to handle that.

currently my code is like:

Select ItemID From Template Where Name = 'Test1';
$strItems = explode('/', ItemID)
foreach($strItem in $strItems)
{
 select * from Items where ID = $strItem
}

that's not the pretty/well formatted code, but to show how i am working now.. but i am looking for a better approach :)

best regards

Answer 1

You may use FIND_IN_SET here, with a single query:

SELECT i.*
FROM Items i
INNER JOIN Template t
    ON FIND_IN_SET(i.ID, REPLACE(t.ItemID, '/', ',')) > 0
WHERE
    t.Name = 'Test1';

Demo

But note that storing unnormalized data as you have done in the Template table is not idea at all. It would be much better to store the ItemID values across separate rows.