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MySQL选择从一列开始计数等于0或大于0的值？

2024-05-11 04:09:03 364

为此，请使用CASE语句。让我们首先创建一个表-

mysql> create table DemoTable
   (
   Number int
   );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable values(10);
mysql> insert into DemoTable values(0);
mysql> insert into DemoTable values(20);
mysql> insert into DemoTable values(50);
mysql> insert into DemoTable values(0);
mysql> insert into DemoTable values(0);
mysql> insert into DemoTable values(40);

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

输出结果

+--------+
| Number |
+--------+
| 10     |
| 0      |
| 20     |
| 50     |
| 0      |
| 0      |
| 40     |
+--------+
7 rows in set (0.00 sec)

现在让我们看看如何从列中选择等于0且大于0的计数值

mysql> select sum(case when Number > 0 then 1 else 0 end )
AS TotalValueWhichIsGreaterThanZero,
   sum(case when Number = 0 then 1 else 0 end) AS TotalValueWhichIsEqualToZero
   from DemoTable where Number >=0;

输出结果

+----------------------------------+------------------------------+
| TotalValueWhichIsGreaterThanZero | TotalValueWhichIsEqualToZero |
+----------------------------------+------------------------------+
| 4                                | 3                            |
+----------------------------------+------------------------------+
1 row in set (0.00 sec)

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MySQL选择从一列开始计数等于0或大于0的值？

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