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MySQL query to select rows where column value is only 0, group by another column?
For this, use group by. Let us first create a table −
mysql> create table DemoTable1344 -> ( -> `SequenceId` int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> ClientId int, -> isMarried tinyint(1) -> ); Query OK, 0 rows affected (0.49 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1344(ClientId,isMarried) values(4567,0); Query OK, 1 row affected (0.45 sec) mysql> insert into DemoTable1344(ClientId,isMarried) values(9876,0); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1344(ClientId,isMarried) values(5432,1); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1344(ClientId,isMarried) values(4567,1); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1344(ClientId,isMarried) values(9873,0); Query OK, 1 row affected (0.15 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1344;
This will produce the following output −
+------------+----------+-----------+ | 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)
Following is the query to select rows where column value is only 0, group by another column −
mysql> select SequenceId,ClientId,isMarried -> from DemoTable1344 -> group by ClientId -> having isMarried=0;
This will produce the following output −
+------------+----------+-----------+ | SequenceId | ClientId | isMarried | +------------+----------+-----------+ | 1 | 4567 | 0 | | 2 | 9876 | 0 | | 5 | 9873 | 0 | +------------+----------+-----------+ 3 rows in set (0.00 sec)
Updated on: 05-Nov-2019
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