ceng 351 database etiketindeki yazılar
Ceng 351 / Database »

? One-to-One Relation
An entity may be related to zero or one entity
in another entity set.
? Like Chairman – Department Relation
Devamını Oku »Ceng 351 / Database »

Entity ? Relationship model is a Database design tool for creating a diagram.
( ?entity? means record, object )
? Binary Relationship Set
? Ternary Relationship Set
There are kinds of attributes. Some of them is like that:
? Single valued attribute: at most one value
?Multi-valued attribute: 0 or more similar values. We don?t put them to the E-R diagram, but we can…
Ceng 351 / Database »

Basic terms which we will use in this lecture:
schema = structure
instance = data
data dictionary (containing name of the tables)
SQL is a
-data management language:
insert a record, update a record, delete a record
-query language: select
…
Ceng 351 / Database »

Hey, i decided to share my database notes with you.
Not all of them, but just the important parts.
I hope they are gonna be useful for you:)
Hope to start it immediately, by!