How do I Loop through a table and update a field in SQL, Sql Server

How do I Loop through a table and update a field in SQL

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Execution time: 0 sec, rows selected: 6, rows affected: 12, absolute service time: 0,17 sec

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RowId
AccountId
OrderId

1
1
A
1

2
2
A
2

3
4
A
3

4
5
B
1

5
6
B
2

6
7
C
1

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