Question

this is the first time I’m posting here! Hope to get a good reply.

I have two table, and based on the path I need to locate and replace with ” the name of table2 in the name of table1.

table1
+---------------+----------+
| name          | path     |
+---------------+----------+
| John Smith    | 12345    |
+---------------+----------+
| John Smith    | 54321    |
+---------------+----------+
| JohnSmith     | 12345    |
+---------------+----------+

table2
+---------------+----------+
| name          | path     |
+---------------+----------+
| John          | 12345    |
+---------------+----------+
| Smith         | 54321    |
+---------------+----------+

the final result would be like
+---------------+----------+
| name          | path     |
+---------------+----------+
| Smith         | 12345    |
+---------------+----------+
| John          | 54321    |
+---------------+----------+
| JohnSmith     | 12345    |
+---------------+----------+

as you can see I need to replace only the exact match. So in JohnSmith I don’t remove John.

The question is also, do I do it only with a mysql query? Or some php is also needed for something like that?

Thank you in advance.

---

both queries are close, but don’t give exactly what I need as an output.

e.g. the first one produce

NAME        PATH
Smith       12345
John        54321
Smith       12345

here the last row, should not be changes. As we don’t have any exact match. and the row should stay the same “JohnSmith”

in the second one, the output is

NAME        PATH
Smith       12345
John Smith  54321
JohnSmith   12345

here the second line seems wrong, as it should remove “Smith”

any idea ?

Answer 1

This is close, but I admittedly don’t understand your last condition — shouldn’t it be Smith/12345? This uses REPLACE:

SELECT REPLACE(t1.Name, t2.Name, '') Name, t1.Path
FROM Table1 t1
  LEFT JOIN Table2 t2 ON t1.path = t2.path

And here is the SQL Fiddle.

–EDIT–

Here is an attempt using a CASE statement. It checks for in the middle, in the beginning, or at the end:

SELECT 
  CASE 
    WHEN t1.Name Like CONCAT('% ',IFNULL(t2.Name,''),' %')
    THEN REPLACE(t1.Name, CONCAT(' ',IFNULL(t2.Name,''),' '), ' ') 

    WHEN t1.Name Like CONCAT(IFNULL(t2.Name,''),' %')
    THEN REPLACE(t1.Name, CONCAT(IFNULL(t2.Name,''),' '), '') 

    WHEN t1.Name Like CONCAT('% ',IFNULL(t2.Name,''))
    THEN REPLACE(t1.Name, CONCAT(' ',IFNULL(t2.Name,''),' '), '') 

    ELSE
       t1.Name

END Name, t1.Path
FROM Table1 t1
  LEFT JOIN Table2 t2 ON t1.path = t2.path

And more Fiddle.

Produces the following results:

NAME        PATH
Smith       12345
John Smith  54321
JohnSmith   12345