在MySQL中执行NAND / NOR操作
首先让我们看看如何在MySQL中执行NAND/NOR操作。这个概念如下-
NAND= NOT( yourColumnName1 AND yourColumnName2) NOR=NOT( yourColumnName1 OR yourColumnName2)
让我们首先创建一个表-
mysql> create table DemoTable ( Value1 boolean , Value2 boolean );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values(true,true); mysql> insert into DemoTable values(false,false); mysql> insert into DemoTable values(false,true); mysql> insert into DemoTable values(true,false);
使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
这将产生以下输出-
+--------+--------+ | Value1 | Value2 | +--------+--------+ | 1 | 1 | | 0 | 0 | | 0 | 1 | | 1 | 0 | +--------+--------+ 4 rows in set (0.00 sec)
以下是执行NAND/NOR操作的查询-
mysql> select Value1,Value2, NOT(Value1 AND Value2) AS NAND_Result,NOT(Value1 OR Value2) AS NOR_Result from DemoTable;
这将产生以下输出-
+--------+--------+-------------+------------+ | Value1 | Value2 | NAND_Result | NOR_Result | +--------+--------+-------------+------------+ | 1 | 1 | 0 | 0 | | 0 | 0 | 1 | 1 | | 0 | 1 | 1 | 0 | | 1 | 0 | 1 | 0 | +--------+--------+-------------+------------+ 4 rows in set (0.00 sec)