Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
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: 11-Dec-2019
790 Views
Advertisements