Hello and welcome.
In this vigil we will be using the Eskew update to date existing data in a database table.
The Escuela update is used to change a set of data that is already present within the database table.
So if you have you working for a corporation and you need to make a huge update on say an e-mail address
or something you can imagine if you got like 20 tiles on or so rockwoods to a date.
I ask you a lot.
It can be used to achieve that with very minimum effort.
I have got to add for a quote utopian I am going to date a record from the destination table that we
created in a few years ago.
So to date records record you begin with the data keyword Google update.
So you start with a keyword update followed by the name of the table.
You want one day to take place in its destination.
Last name of my table then use to set.
So this set indicates the new value you want to give the data you are dating.
So I'm going to set it up you need to give it a value with it equals two sizes too.
It was close just set in the value so you need to.
Yes pacify the data.
So I want to set the country
to equal to you yes.
Where you must specify way.
If you don't use the WHERE clause to act as a filter it will update all the records on that table.
It's very important to use their where CLOs cause the WHERE clause as a filter.
I will only update the records you have specified So where country
he was to.
You.
Yes he saw what I'm going to do wherever I have.
Quite the contrary cord web.
What a country call you like USC.
Win or date it would United States.
So don't forget your quotes.
If you are using strings always place your text in between quotes.
So this is the odd day steepen of date table destination.
This is a new value.
You set the new value with this set keywords some will have set the contrary column as a column column
country and destination table and when set that country to you was to the new value of United States.
I now use your where clause to act as a filter.
She don't use a word clause.
It will date everything from that table so be careful.
So the where clause acts as a filter.
So where the country name is equals to USC to change that to United States.
So let's look at B records the way it is at the moment to a select.
Start from destination.
Let's look at the table the way it is at the moment.
So I run that.
All right so this is the current data.
So I've got one USA there.
Okay.
I've got one USA.
So what this query is doing is looking for anywhere where the countries you see it to day that to the
United States.
So to execute this query should give me Chichis this to United States.
Let's do that.
Go there and then go on day to see that one row updated one row of data some data.
So they need to commit to it where you are data records especially if you're dealing with large records
ones you've got data that you can always check new value but you can still roll it back if you're not
sure.
So but once you are sure then commit was you commit the information stays permanent.
So let me run this again.
You see that is now changed to United States.
So wherever it was you see some data added to United States.
Imagine the four have thousands of beath to update this query would have done it in six months.
So that's the power of this secure hobday command.
In this video we use the excuse l r d command to date a record from a database table.
I all the information in this futu has been helpful.
Thank you so much for your time in Washington.
Take care.
Bye for now.
You have a good day.