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Counting with condition in MySQL?
To count, use aggregate function SUM() and to count with condition, you need to set the condition with WHERE. Let us first create a table −
mysql> create table DemoTable1515 -> ( -> ClientId varchar(10), -> ClientName varchar(20) -> ); Query OK, 0 rows affected (0.53 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1515 values('CLI-101','Chris');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable1515 values('CLI-110','David');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable1515 values('CLI-101','Bob');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable1515 values('CLI-101','Sam');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable1515 values('CLI-101','Sam');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable1515 values('CLI-101','Mike');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable1515 values('CLI-130','Mike');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable1515 values('CLI-101','Chris');
Query OK, 1 row affected (0.35 sec)
mysql> insert into DemoTable1515 values('CLI-101','Sam');
Query OK, 1 row affected (0.18 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1515;
This will produce the following output −
+----------+------------+ | ClientId | ClientName | +----------+------------+ | CLI-101 | Chris | | CLI-110 | David | | CLI-101 | Bob | | CLI-101 | Sam | | CLI-101 | Sam | | CLI-101 | Mike | | CLI-130 | Mike | | CLI-101 | Chris | | CLI-101 | Sam | +----------+------------+ 9 rows in set (0.00 sec)
Here is the query to count with condition −
mysql> select ClientId,sum(ClientName='Sam') as NameOn101Id,count(*) as TotalNameOn101 from DemoTable1515 -> where ClientId='CLI-101';
This will produce the following output −
+----------+-------------+----------------+ | ClientId | NameOn101Id | TotalNameOn101 | +----------+-------------+----------------+ | CLI-101 | 3 | 7 | +----------+-------------+----------------+ 1 row in set (0.00 sec)
Updated on: 2019-12-11T06:19:44+05:30
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