Answer:
FROM.
Explanation:
UPDATE table
SET column=value,column1=value1,.....
WHERE condition;
In the UPDATE command given in the question FROM is optional because when using UPDATE we already mention the table name with update look at the syntax above.So there is no need to again mention the table name in FROM.All other three are required that is UPDATE,SET,WHERE.
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There are two common types for data access or retrieval
1. Sequential access is the main access mode only in batch systems, whereas files are used and updated at regular intervals.
2. Direct access - on-line processing requires direct access, whereby a record can be accessed without accessing the records between it and beginning of the file.
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