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计算MySQL表中非空或非零列的数量？

2024-05-01 12:22:05 341

使用if()方法。让我们首先创建一个表-

mysql> create table DemoTable
   -> (
   -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> Number1 int,
   -> Number2 int
   -> );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable(Number1,Number2) values(10,20);

mysql> insert into DemoTable(Number1,Number2) values(0,32);

mysql> insert into DemoTable(Number1,Number2) values(40,0);

mysql> insert into DemoTable(Number1,Number2) values(40,50);

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

输出结果

这将产生以下输出-

+----+---------+---------+
| Id | Number1 | Number2 |
+----+---------+---------+
| 1  | 10      | 20      |
| 2  | 0       | 32      |
| 3  | 40      | 0       |
| 4  | 40      | 50      |
+----+---------+---------+
4 rows in set (0.00 sec)

以下是查询以计算表中非空或非零列的数量的查询-

mysql> select *,
-> if(Number1 <> 0,1,0)+if(Number2 <> 0,1,0) AS TotalCount
-> from DemoTable;

输出结果

这将产生以下输出-

+----+---------+---------+------------+
| Id | Number1 | Number2 | TotalCount |
+----+---------+---------+------------+
| 1  | 10      | 20      | 2          |
| 2  | 0       | 32      | 1          |
| 3  | 40      | 0       | 1          |
| 4  | 40      | 50      | 2          |
+----+---------+---------+------------+
4 rows in set (0.00 sec)

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计算MySQL表中非空或非零列的数量？

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