How to update a table with data from same table in SQL

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I have a table in SQL which I want to update

NAME   Emp_ID   Points   TotalPoints
ABC    1        50       0
ABC    1        40       0
XYZ    2        20       0
LMN    3        30       0
LMN    3        50       0
XYZ    2        10       0
LMN    3        5        0

Please help me to update the same table as shown below by summing up the points

NAME   Emp_ID   Points   TotalPoints
ABC    1        50       90
ABC    1        40       90
XYZ    2        20       30
LMN    3        30       85
LMN    3        50       85
XYZ    2        10       30
LMN    3        5        85

What I have tried:

I am a biginer in SQL. I tried joining the same table but could find a solution. Please help

Posted 23-Apr-20 21:12pm

vivektp

Updated 23-Apr-20 21:39pm

Maciej Los

v2

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Maciej Los · Accepted Answer · 2020-04-23T21:23:00

Solution 1

I'd try something like that:

SQL

UPDATE dst 
  SET dst.TotalPoints= src.TotalPoints
FROM
    YourTable AS dst
    INNER JOIN
    (
        SELECT Emp_ID, SUM(Points) AS TotalPoints
        FROM YourTable
        GROUP BY Emp_ID
    ) AS src ON dst.Emp_ID = src.Emp_ID

Posted 23-Apr-20 21:23pm

Maciej Los

Updated 23-Apr-20 21:25pm

v2

Comments

MadMyche 24-Apr-20 6:45am

+5

Maciej Los 24-Apr-20 6:59am

Thank you.

OriginalGriff · Accepted Answer · 2020-04-23T21:40:00

Solution 2

Try INSERT ... FROM and a JOIN to a GROUP BY:

SQL

UPDATE Points 
SET TotalPoints = tot
FROM Points p 
INNER JOIN (SELECT Emp_ID, SUM(Points) AS tot 
                   FROM Points 
                   GROUP BY Emp_id) t
ON t.Emp_ID = p.Emp_ID

Posted 23-Apr-20 21:40pm

OriginalGriff

Comments

MadMyche 24-Apr-20 6:45am

+5