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How to convert positive value to negative while inserting in MySQL?
Let us first create a table
mysql> create table recordsDemo -> ( -> UserId int, -> Value int -> ); Query OK, 0 rows affected (0.52 sec)
Now insert some records in the table using insert command.
The query is as follows
mysql> insert into recordsDemo values(1,10); Query OK, 1 row affected (0.17 sec) mysql> insert into recordsDemo values(3,598); Query OK, 1 row affected (0.18 sec) mysql> insert into recordsDemo values(5,786); Query OK, 1 row affected (0.25 sec) mysql> insert into recordsDemo values(7,189); Query OK, 1 row affected (0.16 sec) mysql> insert into recordsDemo values(9,345); Query OK, 1 row affected (0.14 sec)
Display all records from the table using select statement.
The query is as follows
mysql> select *from recordsDemo;
The following is the output
+--------+-------+ | UserId | Value | +--------+-------+ | 1 | 10 | | 3 | 598 | | 5 | 786 | | 7 | 189 | | 9 | 345 | +--------+-------+ 5 rows in set (0.00 sec)
Create a second table. The query to create a second table is as follows
mysql> create table PositiveToNegativeValueDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Money int -> ); Query OK, 0 rows affected (0.83 sec)
Here is the query to convert positive value to negative while inserting
mysql> insert into PositiveToNegativeValueDemo(Id,Money) -> select UserId,(-1*Value) from recordsDemo; Query OK, 5 rows affected (0.15 sec) Records: 5 Duplicates: 0 Warnings: 0
Now check table records from the table using select statement.
The query is as follows
mysql> select *from PositiveToNegativeValueDemo;
The following is the output
+------+-------+ | Id | Money | +------+-------+ | 1 | -10 | | 3 | -598 | | 5 | -786 | | 7 | -189 | | 9 | -345 | +------+-------+ 5 rows in set (0.00 sec)
Updated on: 30-Jul-2019
1K+ Views
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