How this query works ?

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i just wanted find the how many times b has occurred.
Can you please explain this query. it would be helpful
Thanks !

What I have tried:

INSERT INTO tblname
values ('abbcbbcbbb')

select name, len(name)-len(replace(name,'b',''))/len('b') from #temp
Go
--7

Posted 3-Sep-18 13:32pm

Member 13138564

Updated 3-Sep-18 15:11pm

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Mohibur Rashid 3-Sep-18 20:29pm

Logic seems ok, what is the problem?

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Eric Lynch · Accepted Answer · 2018-09-03T15:11:00

Just break it down bit by bit...

len(name) = 10
replace(name,'b','') = 'acc'
len('acc') = 3
10 - 3 = 7

Basically, your "replace" removes all of the letters 'b'. So, all that remains are the letters that are NOT 'b'. The difference in length between the original (which includes 'b') and replacement (which does not include 'b') is the number of 'b's.

The divide by len('b') is unnecessary...since, that is simply 1...and dividing by 1 does nothing.