First of all iam so sorry because my english is very bad...I hope you can understand what i want to ask...

first that I wanted to ask what was that had heard or knew about the control of data access?Especially the security of the data?

I knew that was 3, is DAC, MAC and RBAC...
I wan to ask about the principle of control access discretionary (DAC) in sql was depicted by what?

Control access discretionary meaning that the access rule that was determined by the owner of the object.
The owner took the decision whoever was permitted to access the object and the privilege what they had.
Was that the same as Grant?

What implementation was suitable to show this DAC principle with used sql??

Thank for you answer.......

What database engine are you using? SQL Server? Oracle? Access? dBase or Paradox? Postgres?

In SQL Server, we tend to secure access to database objects either by granting and revoking permission for individual user accounts, or by doing that at the role level instead. Say you work for a big company, with 20 customer service representatives. Instead of granting all 20 of them access to 15 objects they might need to do their jobs (that would be a lot of work!) it would be more common to make a role called CustServRep, or something like it, add these 20 people to that role, and then rant the role permission to the 15 objects.

It's also very common to revoke permission to the tables from almost everyone, but to leave views and procedures in place. This adds a great deal of security, in a lot of different ways. People can't make unauthorized changes, can't see data that isn't meant for them, and it becomes harder to accidentally break things.