'+' String concatenation minor accidents caused by

First, string concatenation

    Demand: account_code original data base to label 'HSJS' in front ......

    1) a misuse:

mysql> update  tbpayment_settlement  set  account_code = ('HSJS'+ account_code) where  id = 616783;
1292 - Truncated incorrect DOUBLE value: 'HSJS'
mysql> 

   2) misuse II:

mysql> update  tbpayment_settlement  set  account_code = ('1001'+ account_code) where  id = 616783;
1292 - Truncated incorrect DOUBLE value: 'HSJS201908'
mysql> 

     supplement:

mysql> select  account_code from  tbpayment_settlement  where id = 616783;
+--------------+
| account_code |
+--------------+
| 201908       |
+--------------+
1 row in set

mysql> 

Solution: account_code to varchar type, can not be used '+' to the string concatenation, '+' for numeric type are added. And the string should be used concat (str1, str2, ...) function.

   3) the correct answer

mysql> update  tbpayment_settlement  set  account_code = concat('HSJS',account_code) where  id = 616783;
Query OK, 1 row affected
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select  account_code from  tbpayment_settlement  where id = 616783;
+----------------+
| account_code   |
+----------------+
| HSJS201908     |
+----------------+
1 row in set

mysql>