Update all the zero values with a custom value in MySQL with a function similar to ISNULL()

For this, you can use custom IF() and set a value whenever 0 appears.

Let us first create a table −

mysql> create table DemoTable749 (Value int);
Query OK, 0 rows affected (1.02 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable749 values(10);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable749 values(0);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable749 values(769);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable749 values(0);
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable749 values(78);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable749 values(0);
Query OK, 1 row affected (0.17 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable749 ;

This will produce the following output -

+-------+
| Value |
+-------+
|    10 |
|     0 |
|   769 |
|     0 |
|    78 |
|     0 |
+-------+
6 rows in set (0.00 sec)

Following is the query to check for zero value −

mysql> select *,if(Value=0,100000,Value) from DemoTable749;

This will produce the following output -

+-------+--------------------------+
| Value | if(Value=0,100000,Value) |
+-------+--------------------------+
|    10 |                       10 |
|     0 |                   100000 |
|   769 |                      769 |
|     0 |                   100000 |
|    78 |                       78 |
|     0 |                   100000 |
+-------+--------------------------+
6 rows in set (0.00 sec)