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I have one table A has column (id, field_1,field_2), and another table B has column (id,field_2) Now I want to merge table B to A, that means i want to update field_2 in table A to value of table B. BTW I am using oracle Thanks Now, each time the above is executed, it will do it across all rows in the table.

If this is something you need to do all the time, I would suggest something else, but for a one-off or very small tables it should be sufficient.

You will be given questions that you need to solve.

After each exercise, we provide the solution so you can check your answer.

Notice that the WHERE clause identifies which row will be updated with Oracle UPDATE SQL.

If you omit the WHERE clause, all records in the table will be updated!

The Oracle UPDATE statement processes one or more rows in a table and then sets one or more columns to the values you specify.

UPDATE Example: The UPDATE statement is normally used with the WHERE clause in order to specify which rows are to have their columns changed.

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The first syntactical form, called a searched update, updates the value of one or more columns for all rows of the table for which the WHERE clause evaluates to TRUE.-- Indicate this by changing their job (JOB) to NULL and their pay -- (SALARY, BONUS, COMM) values to zero in the EMPLOYEE table.A searched update statement depends on the table being updated, all of its conglomerates (units of storage such as heaps or indexes), all of its constraints, and any other table named in the WHERE clause or SET expressions.If no columns were specified or the select statement did not include a FOR UPDATE clause, all columns may be updated.Specifying DEFAULT for the update value sets the value of the column to the default defined for that table.

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