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If you update values in multiple columns, you use a comma (,) to separate each pair of column and value.
The columns that are not on the list retain their original values.
All brands support use of the DEFAULT keyword as a way of explicitly specifying the default value for a column.
Some brands provide additional ways to solve the problem.
The query may be complex or simple, but ultimately you want the result to be inserted into another table.
For example, you want to copy rows from the DEPT table to the DEPT_EAST table.
Like a regular insert, you do not have to explicitly specify which columns you are inserting into.
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This option takes a list of one or more partitions or subpartitions (or both).
For multiple-table updates, there is no guarantee that assignments are carried out in any particular order.
If you set a column to the value it currently has, My SQL notices this and does not update it.
But you can also update whole sets of records at once, and in very powerful ways. For example, you can delete rows in one table depending on whether or not they exist in another table.