Optimising the number of UPDATEs by grouping the distinct SET values can be done in a way which is compatible with most common SQL databases.

FROM approach requires knowledge of the specific SQL database being used.

So is structured so that approaches which are generic across different SQL databases are expressed in a base class, and approaches which only work for specific SQL databases are expressed in a subclass.

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The SET clause then takes the “salary” field from the “updates” table and uses it to update the “salary” field of the “staff” table.

We can easily contrive for an “updates” table to exist by creating a temporary table and populating it.

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