Update query with Join SQL Server - sql-server

Question

I have these two tables
The first image represents ObjectData Table, and the second ColumnsSet Table.
In ObjectData the ColID attribute represents the foreign key of ColumnID in ColumnsSet Table.
I want to update a cell in Data attribute of ObjectData for example number 10 to be 20.
query :
UPDATE ObjectData SET ObjectData.Data = 'Ahmed'
FROM ColumnsSet
INNER JOIN ObjectData ON ColumnsSet.ColumnID = ObjectData.ColID
WHERE ObjectData.ColID = ColumnsSet.ColumnID
What is the correct SQL statement?

Answer 1

UPDATE a SET a.Data = 'Ahmed'
FROM ObjectData a
INNER JOIN ColumnsSet ON ColumnsSet.ColumnID = a.ColID
when you are using inner join it selects data which returns join condition true and not null datas
there is no need to this 'where ....'
but you have to be sure which data will update
at first use this code and select all data
SELECT *
FROM ObjectData a
INNER JOIN ColumnsSet ON ColumnsSet.ColumnID = a.ColID
and then write where clause
then change it to update

Answer 2

Let me show on example how to update.
At first, we should create tables:
CREATE TABLE ObjectData
(
ID INT,
CollID INT,
Data VARCHAR(50)
)
CREATE TABLE ColumnSet
(
ColumnID INT,
ColumnName VARCHAR(50)
)
Then insert data:
INSERT INTO ObjectData
(
ID,
CollID,
Data
)
VALUES
( 113, -- ID - int
1, -- CollID - int
'1' -- Data - varchar(50)
)
, (114, 5, '')
, (115, 10015, 'Mohamed')
, (116, 20026, 'Abdulghani')
INSERT INTO ColumnSet
(
ColumnID,
ColumnName
)
VALUES
( 1, -- ColumnID - int
'ID' -- ColumnName - varchar(50)
)
, (5, 'EmployeeID')
, (10015, 'FirsName')
And the final step is updating where you should write what rows need to be updated by WHERE operator:
UPDATE od
SET od.Data = 'Hey!'
FROM ObjectData od
INNER JOIN ColumnSet cs ON cs.ColumnID =od.CollID
--WHERE OD.DATA IN ('1', '10')
WHERE OD.CollID IN (1, 5)
You can write in WHERE statement any condition to choose your row which will be updated.
--Check our update statements:
SELECT
*
FROM ObjectData od
INNER JOIN #ColumnSet cs ON cs.ColumnID =od.CollID
WHERE OD.DATA IN ('1', '10')