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NOT,!

Operator Description

NOT,! logical operator is used for logical non- operations. If the operand is zero, the result is true; if the operand is non-zero, the result is false; if the operand is NOT NUL, the result is NULL.

Grammar Structure

> SELECT not column_name FROM table_name;

Example

mysql> select not 0;
+--------+
| not 0 |
+--------+
| true |
+--------+
1 row in set (0.02 sec)
mysql> select not null;
+-------------+
| not null |
+-------------+
| NULL |
+-------------+
1 row in set (0.00 sec)
mysql> select not 1;
+--------+
| not 1 |
+--------+
| false |
+--------+
1 row in set (0.01 sec)

create table t1 (a boolean,b bool);
insert into t1 values ​​(0,1),(true,false),(true,1),(0,false),(NULL,NULL);

mysql> select not a and not b from t1;
+-----------------------+
| not a and not b |
+-----------------------+
| false |
| false |
| false |
| true |
| NULL |
+-----------------------+
5 rows in set (0.00 sec)

limit

MatrixOne does not support the ! operator for the time being.