00:01
In this question, here all relations name, entity name and here underlined are primary attributes.
00:25
Underlined are what? underlined, these are primary attributes.
00:33
Further, the relation which consists primary key of two other entities and other attributes are called what? these are the relation between two or more entities like we can say like a b and a b c.
00:51
It is like that.
00:53
Now, further we can say that a b is a binary relation.
00:56
It is what? a b is what? this is our binary relation and when we talk about a b c, then it is what? this is a tertiary, ternary relation.
01:06
This is ternary relation.
01:09
Further, the c l relation is created due to the multi value attribute.
01:16
C l relation is created due to multi value, okay? multi value attribute and relation m contain the primary key of relation b.
01:34
So, it is what? relation m is what? so, relation m is weak entity.
01:46
Now, we draw the er diagram.
01:55
So, the er diagram is like we have, it is the center one box.
02:05
It is connected with this box, connected with this one box.
02:16
It contains another box.
02:18
Here, this is n2.
02:21
This is n1.
02:24
This is the a and this is the b.
02:41
It is connected with the n1.
02:52
Let me draw the, initially let me draw the base diagram.
02:55
Then, i will fill each of the entities, okay? so, it is like connected like this.
03:02
This and this is connected.
03:07
So, these are further connected like this.
03:11
Here, it has a connection.
03:13
Then, here it has a connection.
03:15
Then, here it has a connection.
03:17
Then, here it has a connection.
03:20
When we talk about this, it has only one connection here.
03:24
And it had two connections here.
03:26
One here and one here.
03:30
This is further connected from here to here with this entity like this.
03:38
It has one connection here.
03:42
And further connected here like this.
03:49
And then, one, two, three and then the fourth one...