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How can I set 0 if a query returns a null value in MySQL?
For this, you can use IFNULL(). Let us first create a table −
mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Value int -> ); Query OK, 0 rows affected (0.71 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(Value) values(100); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(Value) values(140); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(Value) values(200); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable(Value) values(450); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(Value) values(null); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(Value) values(90); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Value) values(null); Query OK, 1 row affected (0.10 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
+----+-------+ | Id | Value | +----+-------+ | 1 | 100 | | 2 | 140 | | 3 | 200 | | 4 | 450 | | 5 | NULL | | 6 | 90 | | 7 | NULL | +----+-------+ 7 rows in set (0.00 sec)
Following is the query to set 0 if a query returns a null value in MySQL.
mysql> select ifnull(Value,0) AS Value from DemoTable;
Output
+-------+ | Value | +-------+ | 100 | | 140 | | 200 | | 450 | | 0 | | 90 | | 0 | +-------+ 7 rows in set (0.00 sec)
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