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I require 3 different counts on single column for different conditions.
Table structure:
interview-
id-int(10)
c_id-int(10)
experience-varchar2(100)
experience have 3 different values- 1)positive 2)negative 3)neutral
I require 3 different counts of "count_positive", "count_negative" and "count_neutral" for where condition of c_id=10.
I know it can get by 3 different queries. Can I able to get 3 counts by single query?
912
Overall, you can use * or ALL or DISTINCT or some expression along with COUNT to COUNT the number of rows w.r.t. some condition or all of the rows, depending up on the arguments you are using along with COUNT() function. Applies to all values. ALL returns the number of non NULL values.
In SQL, you can make a database query and use the COUNT function to get the number of rows for a particular group in the table. Here is the basic syntax: SELECT COUNT(column_name) FROM table_name; COUNT(column_name) will not include NULL values as part of the count.
You can count multiple COUNT() for multiple conditions in a single query using GROUP BY. SELECT yourColumnName,COUNT(*) from yourTableName group by yourColumnName; To understand the above syntax, let us first create a table. The query to create a table is as follows.
Use the COUNT function to get the number of entries in a number field that is in a range or array of numbers. For example, you can enter the following formula to count the numbers in the range A1:A20: =COUNT(A1:A20). In this example, if five of the cells in the range contain numbers, the result is 5.
Obviously, COUNT(DISTINCT) with multiple columns counts unique combinations of the specified columns' values. However, one other important point is that a tuple is counted only if none of the individual values in the tuple is null.
You can use the COUNTIFS function in Excel to count cells in a single range with a single condition as well as in multiple ranges with multiple conditions. If the latter, only those cells that meet all of the specified conditions are counted.
COUNT() with HAVINGThe HAVING clause with SQL COUNT() function can be used to set a condition with the select statement. The HAVING clause is used instead of WHERE clause with SQL COUNT() function.
Count how often a single value occurs by using the COUNTIF function. Use the COUNTIF function to count how many times a particular value appears in a range of cells.
SELECT
SUM(CASE experience
WHEN 'positive' THEN 1
ELSE 0
END) AS CountPositive
, SUM(CASE experience
WHEN 'negative' THEN 1
ELSE 0
END) AS CountNegative
, SUM(CASE experience
WHEN 'neutral' THEN 1
ELSE 0
END) AS CountNeutral
FROM Interview
WHERE c_id = 10
select 'Positive Count' , count(*)
from interview
where experience = 'positive'
UNION
select 'Negative Count' , count(*)
from interview
where experience = 'negative'
UNION
select 'Neutral' , count(*)
from interview
where experience = 'neutral'
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