Find integer within +/- 1 from a column in MySQL

For this, use BETWEEN -1 AND 1. Let us first create a table −

mysql> create table DemoTable
(
   Value int
);
Query OK, 0 rows affected (0.76 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values(14);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values(15);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable values(16);
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable values(17);
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable values(18);
Query OK, 1 row affected (0.09 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+-------+
| Value |
+-------+
|    14 |
|    15 |
|    16 |
|    17 |
|    18 |
+-------+
5 rows in set (0.00 sec)

Following is the query to find integer within +/- 1 −

mysql> select *from DemoTable
   where (Value-17) between -1 and 1;

This will produce the following output −

+-------+
| Value |
+-------+
|    16 |
|    17 |
|    18 |
+-------+
3 rows in set (0.03 sec)