How to Count the Number of Times a Character Appears in a SQL Column

How to count occurrences of a column value efficiently in SQL?

This should work:

SELECT age, count(age) 
  FROM Students 
 GROUP by age

If you need the id as well you could include the above as a sub query like so:

SELECT S.id, S.age, C.cnt
  FROM Students  S
       INNER JOIN (SELECT age, count(age) as cnt
                     FROM Students 
                    GROUP BY age) C ON S.age = C.age

How to count the number of times a character appears in a SQL column?

SELECT LEN(RequestedReportParams) - LEN(REPLACE(RequestedReportParams, ',', ''))
FROM YourTable
WHERE .....

This is simply comparing the length of the column with the commas, with the length of the value with the commas removed, to give you the difference (i.e. the number of commas)

Number of times a particular character appears in a string

There's no direct function for this, but you can do it with a replace:

declare @myvar varchar(20)
set @myvar = 'Hello World'

select len(@myvar) - len(replace(@myvar,'o',''))

Basically this tells you how many chars were removed, and therefore how many instances of it there were.

Extra:

The above can be extended to count the occurences of a multi-char string by dividing by the length of the string being searched for. For example:

declare @myvar varchar(max), @tocount varchar(20)
set @myvar = 'Hello World, Hello World'
set @tocount = 'lo'

select (len(@myvar) - len(replace(@myvar,@tocount,''))) / LEN(@tocount)

How to count instances of character in SQL Column

In SQL Server:

SELECT LEN(REPLACE(myColumn, 'N', '')) 
FROM ...

How do you count the number of occurrences of a certain substring in a SQL varchar?

The first way that comes to mind is to do it indirectly by replacing the comma with an empty string and comparing the lengths

Declare @string varchar(1000)
Set @string = 'a,b,c,d'
select len(@string) - len(replace(@string, ',', ''))

count number of times each value appears in a particular column with additional condition

use COUNT(DISTINCT "Group") instead of COUNT(*)

Note that I have demarcated the column name "Group" with double quotes since it is an SQLite keyword. See here for details: https://www.sqlite.org/lang_keywords.html

SQL Count occurrences in a column and calculate total of another

you can try like below , remove distinct

SELECT
     THESTATUS, 
     COUNT(THENAME),
     SUM(THECOST)
FROM THETABLE
GROUP BY thestatus

demo

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