MySQL查询选择列值仅为0的行，按另一列分组？

为此，请使用分组依据。让我们首先创建一个表-

mysql> create table DemoTable1344
   -> (
   -> `SequenceId` int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> ClientId int,
   -> isMarried tinyint(1)
   -> );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable1344(ClientId,isMarried) values(4567,0);
mysql> insert into DemoTable1344(ClientId,isMarried) values(9876,0);
mysql> insert into DemoTable1344(ClientId,isMarried) values(5432,1);
mysql> insert into DemoTable1344(ClientId,isMarried) values(4567,1);
mysql> insert into DemoTable1344(ClientId,isMarried) values(9873,0);

使用select语句显示表中的所有记录-

mysql> select * from DemoTable1344;

这将产生以下输出-

+------------+----------+-----------+
| SequenceId | ClientId | isMarried |
+------------+----------+-----------+
|          1 |     4567 |         0 |
|          2 |     9876 |         0 |
|          3 |     5432 |         1 |
|          4 |     4567 |         1 |
|          5 |     9873 |         0 |
+------------+----------+-----------+
5 rows in set (0.00 sec)

以下是查询以选择列值仅为0的行，并按另一列分组-

mysql> select SequenceId,ClientId,isMarried
-> from DemoTable1344
-> group by ClientId
-> having isMarried=0;

这将产生以下输出-

+------------+----------+-----------+
| SequenceId | ClientId | isMarried |
+------------+----------+-----------+
|          1 |     4567 |         0 |
|          2 |     9876 |         0 |
|          5 |     9873 |         0 |
+------------+----------+-----------+
3 rows in set (0.00 sec)