on duplicate key update result affecting all the rows of the table

Question

I have a table of this structure:

mysql> desc securities;
+-----------------+-------------+------+-----+---------+-------+
| Field           | Type        | Null | Key | Default | Extra |
+-----------------+-------------+------+-----+---------+-------+
| sym             | varchar(19) | NO   | PRI |         |       |
| bqn             | int(11)     | YES  |     | NULL    |       |
| sqn             | int(11)     | YES  |     | NULL    |       |
| tqn             | int(11)     | YES  |     | NULL    |       |
+-----------------+-------------+------+-----+---------+-------+
4 rows in set (0.01 sec)

I am trying to do a select and an update within the same query, so the reason I have chosen

insert into securities (sym, bqn, sqn , tqn) values('ANK', 50,0,1577798) 
on duplicate key update  bqn=bqn+50 , sqn=sqn+0 , tqn=tqn+1577798;

When I ran the above I observed it is in fact changing the values for all the other rows also.

Is this behaviour expected? I am using MySQL Database.

Answer 1

Your fiddle is missing the key, and the INSERT statement in the right panel (where it does not belong in the first place) is using different column names … *sigh*

Define the symbol column as PRIMARY KEY – and use the VALUES() syntax to get the values to add in the ON UPDATE part, so that you don’t have to repeat them every single time:

insert into securities
  (symbol, buyerquan, sellerquan , totaltradedquan)
  values('BANKBARODA', 73, 0, 4290270) 
  on duplicate key update  
    buyerquan=buyerquan+VALUES(buyerquan),
    sellerquan=sellerquan+VALUES(sellerquan),
    totaltradedquan=totaltradedquan+VALUES(totaltradedquan);

Works perfectly fine, result values are as to be expect from the input: http://sqlfiddle.com/#!2/21638f/1