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Specifying DEFAULT for the update value sets the value of the column to the default defined for that table.The DEFAULT literal is the only value which you can directly assign to a generated column.

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SELECT * FROM result_table ORDER BY cust_id; cust_id | address --------- ------------------ 20 | Infinite Loop 30 | Loop Infinite 30 | Loop Infinite 40 | Mt.

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It will refer to the state corresponding to the time you executed COMMIT.

This means if you have already used COMMIT 10 times, ROLLBACK will have an effect on the last execution you have performed.

CREATE TABLE table1 (column1 INT, column2 INT, column3 VARCHAR (100)) INSERT INTO table1 (col1, col2, col3) SELECT 1, 11, 'FIRST' UNION ALL SELECT 11,12, 'SECOND' UNION ALL SELECT 21, 13, 'THIRD' UNION ALL SELECT 31, 14, 'FOURTH' CREATE TABLE table2 (column1 INT, column2 INT, column3 VARCHAR (100)) INSERT INTO table2 (col1, col2, col3) SELECT 1, 21, 'TWO-ONE' UNION ALL SELECT 11, 22, 'TWO-TWO' UNION ALL SELECT 21, 23, 'TWO-THREE' UNION ALL SELECT 31, 24, 'TWO-FOUR' Our requirement is that we have table 2 which has two rows where Col 1 is 21 and 31.

We want to update the value from table 2 to table 1 for the rows where Col 1 is 21 and 31.

We want to also update the values of Col 2 and Col 3 only.

The most easiest and common way is to use join clause in the update statement and use multiple tables in the update statement.

Now what happens if you want to update rows in one table based on the condition of another table?

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