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How do I multiply an unsigned int by -1 on a MySQL SELECT?
Let us first create a table −
mysql> create table DemoTable -> ( -> Value int -> ); Query OK, 0 rows affected (0.80 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.14 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
This will produce the following output −
+-------+ | Value | +-------+ | 10 | | 20 | | 100 | +-------+ 3 rows in set (0.00 sec)
Here is the query to multiply an unsigned int by -1 on a SELECT −
mysql> select cast(Value*-1 as signed) from DemoTable;
Output
This will produce the following output −
+--------------------------+ | cast(Value*-1 as signed) | +--------------------------+ | -10 | | -20 | | -100 | +--------------------------+ 3 rows in set (0.00 sec)
Updated on: 30-Jun-2020
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