Updating multiple rows oracle

The WHERE clause specifies which record(s) that should be updated.I have about 60,000 rows that I'm needing to update the information from column_a to column_b.

Let us start simple, and pretend that the department with id # 20, “Marketing” is from now on going to be named “Customer Relations”.But, the syntax example above might not show the whole truth, since we can have a situation like this: In the expanded version of our UPDATE syntax above, the value that we want to update column1 with, actually comes from a different table.

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