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MySQL查询来计算表列中的0和1的数量，并在两列中显示？

2024-05-19 20:34:26 402

为此，您可以使用聚合函数SUM()。让我们首先创建一个表-

create table DemoTable
(
   isMarried tinyint(1)
);

使用插入命令在表中插入一些记录-

insert into DemoTable values(0);
insert into DemoTable values(1);
insert into DemoTable values(1);
insert into DemoTable values(0);
insert into DemoTable values(1);
insert into DemoTable values(1);
insert into DemoTable values(0);

使用select语句显示表中的所有记录-

select *from DemoTable;

这将产生以下输出-

+-----------+
| isMarried |
+-----------+
|         0 |
|         1 |
|         1 |
|         0 |
|         1 |
|         1 |
|         0 |
+-----------+
7 rows in set (0.00 sec)

以下是查询以从一栏中计算0和1的数目并将其显示在两栏中的查询-

select sum(tbl.isMarried=1) as all_one_count,
   sum(tbl.isMarried=0) as all_zero_count,
   sum(tbl.isMarried in(0,1)) as all_zero_count_and_one_count
   from DemoTable tbl;

这将产生以下输出-

+---------------+----------------+------------------------------+
| all_one_count | all_zero_count | all_zero_count_and_one_count |
+---------------+----------------+------------------------------+
|             4 |              3 |                            7 |
+---------------+----------------+------------------------------+
1 row in set (0.04 sec)

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MySQL查询来计算表列中的0和1的数量，并在两列中显示？

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