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MySQL select count by value?
You can use COUNT() function for this. Let us first create a demo table
mysql> create table countValueDemo -> ( -> ShippingDatetime datetime, -> FirstValue int, -> SecondValue int -> ); Query OK, 0 rows affected (1.35 sec)
Insert some records in the table using insert command. The query is as follows −
mysql> insert into countValueDemo values('2019-01-23',1,2);
Query OK, 1 row affected (0.24 sec)
mysql> insert into countValueDemo values('2017-02-21',NULL,2);
Query OK, 1 row affected (0.13 sec)
mysql> insert into countValueDemo values('2016-04-12',1,NULL);
Query OK, 1 row affected (0.19 sec)Display all records from the table using select statement. The query is as follows −
mysql> select *from countValueDemo;
The following is the output
+---------------------+------------+-------------+ | ShippingDatetime | FirstValue | SecondValue | +---------------------+------------+-------------+ | 2019-01-23 00:00:00 | 1 | 2 | | 2017-02-21 00:00:00 | NULL | 2 | | 2016-04-12 00:00:00 | 1 | NULL | +---------------------+------------+-------------+ 3 rows in set (0.00 sec)
Here is the query to select count by value
mysql> SELECT ShippingDatetime, -> COUNT(*), -> COUNT( IF( FirstValue = 1, 1, NULL ) ), -> COUNT( IF( SecondValue = 2, 1, NULL ) ) -> FROM countValueDemo;
The following is the output
+---------------------+----------+----------------------------------------+-----------------------------------------+ | ShippingDatetime | COUNT(*) | COUNT( IF( FirstValue = 1, 1, NULL ) ) | COUNT( IF( SecondValue = 2, 1, NULL ) ) | +---------------------+----------+----------------------------------------+-----------------------------------------+ | 2019-01-23 00:00:00 | 3 | 2 | 2 | +---------------------+----------+----------------------------------------+-----------------------------------------+ 1 row in set (0.08 sec)
Updated on: 30-Jul-2019
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