Update query with inner join - use updated column value to the another column of same table

Question

I want to update one column valur from the another updated column in same table with same SQL query. There are 3 tables joined in update query as below:

UPDATE table1
     INNER JOIN table2 ON table2.id = table1.pid
     INNER JOIN table3 ON table3.id = table2.cid
SET 
    table1.col1 = "1+2+3",
    table1.col2 = table1.col1 + 5
WHERE 
    table1.id = 5

Any help would be appreciated

Answer 1

You need to specify the table in the SET statement as the fields are ambiguous.

UPDATE table1
  INNER JOIN table2 ON table2.id = table1.pid
  INNER JOIN table3 ON table3.id = table2.cid
----- (Option1 - Shifting values in a single table) -----  
SET  
  table1.col1 = table1.col2,
  table1.col2 = table1.col3,
  table1.col3 = table1.col4
----- (Option2 - Assigning values across tables) -----
SET
  table1.col1 = table2.col2,
  table2.col1 = table3.col2,
  table3.col1 = table1.col2
----- (Option2 - Updating values across tables) -----
SET
  table1.col1 = table1.col2 + 1,
  table2.col1 = table2.col2 - 1,
  table3.col1 = table3.col2 + table3.col1
WHERE
  table1.id = 5

NB: SET commands are done in the order listed so may you need to swop the two lines around in the set to get what you want.

SET
  table1.col2 = table1.col1 + 5,
  table1.col1 = "1+2+3"

Answer 2

According to your comment, if you want the new_value to be updated in Col1 and Col2 columns, you can use the following update block

UPDATE table1
     INNER JOIN table2 ON table2.id = table1.pid
     INNER JOIN table3 ON table3.id = table2.cid
SET 
    table1.col1 = new_value,
    table1.col2 = new_value
WHERE 
    table1.id = 5