how do you restrict number of rows for a particular value
in a column.For example:there is a table called
fruits,having apples,bananas ,papayas.I dont want to have
more than 100 apples in that table ,so how can u restrict
number of rows for apple to hundred?
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Answer Posted / ashwin
You can create a sequence named seq_fruit as below .
create sequence seq_fruit
increment by 1
start with 1
maxvalue 100
minvalue 1
cycle
cache 10
if the current count ie currval of seq_fruit is 100 and
after this if u r inserting a new row in fruit table as
following
insert into fruit values(seq_fruit.nextval,30,40);
after the execution of this statement next value for apple
will be entered as 1 and not 101.
The cycle keyword will avoid the count of fruit column to go
beyond 100.
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