CODEWITHSUNDEEP
sql-server
Ofir Hadad
Ofir Hadad

Reputation: 1900

How to update a column using group by in SQL

I have two tables and I want to update one row from GROUP BY data

This is my code:

2nd code:

UPDATE [TABLE].[dbo].[Movies]
SET [NumFrames] = 
   (SELECT COUNT(ImageURL) as "Count"
    FROM [TABLE].[dbo].[Frames]
    GROUP BY Movie_Id)
GO

1st code:

(SELECT COUNT(ImageURL) as "Count"
FROM [TABLE].[dbo].[Frames]
GROUP BY Movie_Id

1st code give me a row with numbers

Count
 12
  6
 10
 10
 10

I want to insert it into Movies.NumFrames

2nd code give me an Error

Msg 512, Level 16, State 1, Line 1
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

Please help

I'm sure it's simple

Upvotes: 1

Views: 8577

Answers (1)

Peter Lang
Peter Lang

Reputation: 55524

You need to use a WHERE-clause (GROUP BY is not necessary any more).
Otherwise your sub-query returns one row for each Movie_Id, so you have more than one row to use as source for your update.

UPDATE [TABLE].[dbo].[Movies]
   SET [NumFrames] = 
    ( SELECT COUNT(ImageURL) as "Count"
      FROM [TABLE].[dbo].[Frames]
      WHERE [TABLE].[dbo].[Frames].Movie_Id = [TABLE].[dbo].[Movies].Movie_Id
    )

Upvotes: 5

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