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Query Finding Duplicate Values in one table


Query Finding Duplicate Values in one table

By : user2173697
Date : October 20 2020, 08:10 AM
this will help Im trying to write a Query that compares 5 user ids that keyed in different emails and then if it finds two different user ids that keyed in the same email, it will show a single column with the email they used, and 5 other columns showing the number of times it was used for both users, and 0 for the other 3 users who didn't use it in a single table. here's an example: , You can use conditional aggregation to pivot your results:
code :
select email, 
       sum(case when ids = 'U1' then 1 else 0 end) as Id1,
       sum(case when ids = 'U2' then 1 else 0 end) as Id2,
       sum(case when ids = 'U3' then 1 else 0 end) as Id3,
       sum(case when ids = 'U4' then 1 else 0 end) as Id4,
       sum(case when ids = 'U5' then 1 else 0 end) as Id5
from yourtable
group by email
select email, 
       sum(ids = 'U1') as Id1,
       sum(ids = 'U2') as Id2,
       sum(ids = 'U3') as Id3,
       sum(ids = 'U4') as Id4,
       sum(ids = 'U5') as Id5
from yourtable
group by email


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Finding duplicate values in a SQL table

Finding duplicate values in a SQL table


By : mwaka
Date : March 29 2020, 07:55 AM
it helps some times It's easy to find duplicates with one field:
code :
SELECT
    name, email, COUNT(*)
FROM
    users
GROUP BY
    name, email
HAVING 
    COUNT(*) > 1
How to write mysql5 query for finding duplicate rows from a table?

How to write mysql5 query for finding duplicate rows from a table?


By : user3320906
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further since the ID is not unique so its a bit not logical to get the sum of unique UserName from the table.
If the ID is not required we can get the result from single query.
code :
SELECT UserName, COUNT(UserName) AS Count
FROM TableName GROUP BY UserName
HAVING COUNT(UserName) > 1;
Finding duplicate values in a SQL table and group by creation date

Finding duplicate values in a SQL table and group by creation date


By : steffya
Date : March 29 2020, 07:55 AM
help you fix your problem What's the simplest SQL statement that will return the duplicate values for a given column for example ORDERS_NUMBERS and group it by oldest CREATION_DATE in an Oracle database table?
code :
SELECT   ORDER_NUMBERS, count(*)
FROM     YourTableName
GROUP_BY ORDER_NUMBERS
HAVING   count(*) > 1
ORDER BY CREATION_DATE
SQL query for finding duplicate and get others values

SQL query for finding duplicate and get others values


By : Addie Schnirel
Date : March 29 2020, 07:55 AM
this will help GROUP_CONCAT() is probably the simplest way to do what you're trying to do without complicating things using dynamic columns;
code :
SELECT `code ifls`, GROUP_CONCAT(warehouse) warehouses
FROM myTable
GROUP BY `code ifls`
HAVING COUNT(*) > 1
Finding duplicate values in table (and getting their pk's)

Finding duplicate values in table (and getting their pk's)


By : Noam
Date : March 29 2020, 07:55 AM
like below fixes the issue I've a problem selecting some values that I've simplefied into the samples below. Basically, I have a table like this: , As it stands with the table and just the PK index, the first query:
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