CREATE TABLE statement is used to create table objects in database.You can create tables with different column data types.It is possible to add CONSTRAINTS like primary key ,foreign key etc while creating the table or can be added after the table creation.
Oracle Tables: CREATE TABLE statement: create a table with primary key.
Oracle Tables: Foreign Keys with ON DELETE CASCADE option.Foreign Keys with ON DELETE CASCADE option allows us to create parent child tables which automatically deletes referenced data in child tables when deleted from parent table.
‘ORA-02292: integrity constraint violated – child record found’ error occurs when we try to delete a row from a parent table which is having a child table with foreign key constraint and the corresponding data exists in the child table.
Foreign Key holds the reference to another table column value.It is also known as references constraint.
A foreign key means that values in one table must also appear in another table.
Composite primary key is a special type of primary key comprises a set of columns.In relational database a primary key is a candidate key to uniquely identify each row in a table.
In relational database a primary key is a candidate key to uniquely identify each row in a table.
A unique key or primary key comprises a single column or set of columns (COMPOSITE Primary KEY).
CREATE TABLE AS SELECT statement can be used when we need to extract part or full data from a table and store it into another table based on certain conditions
Usage Create table statement with foreign key constraint will create table with referential integrity
Foreign Key holds the reference to another table column value.It is also known as references constraint
CREATE TABLE statement: create a table with composite primary key.