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DML - Data Manipulation Language

9. DML - UPDATE STATEMENT

If you have completed the lab, then you will have four rows in the table. Example one: now I'd like to change the values six, two, and three. Example one: setID equals three where ID equals six. Here, update refers to the operation being performed. Test example one refers to the object where the update is being performed. Set is part of the update syntax, indicating the specifics of the modification. And those specifics will contain the column name that is being modified, which is the column ID in this case, followed by the new value. In this case, it is three where ID equals six, which specifies which rows in that column ID are to be updated. This will update only the rows whose ID column value is six. If you run it, then the table will look like this. Now a question: What if I did not use the where class at all? Then the update statement will update all the rows of the ID column, and it will look like this.

10. Demo of an UPDATE STATEMENT

Let me demonstrate the update statement. This is a DBA window, and this is a test user's window. Let us do show user to verify both in-test users' windows. I have these rows. Now I'd like to change the value six to three by issuing update test example one where ID equals three and ID equals six in one row updated, then verifying with the select star from test dot example. I see the new value of three and then commit the data.

11. DML - DELETE STATEMENT

Let us take a look at the delete statement. Let's just say that we want to delete the value 3. We can do it with this delete statement. Delete from. Here, delete refers to the operation being performed. From is part of the delete syntax, which will be followed by the object name where the delete will happen. In this case, it is test dot example 1, where ID equals 3, which specifies the rows to be deleted.

12. Demo - DELETE STATEMENT

Let me demonstrate the delete statement in the test user window. Let us verify the existing data first. Select Start from test example one. We would like to remove the row containing the value three. So let us do delete from test example onewhere ID equals to three, one row is deleted. Verify it. We see only three rows, and the row containing value three has been removed. Committed.

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